KR20090123786A - Sensor substrate and inspection apparatus - Google Patents

Abstract

PURPOSE: A sensor substrate and inspection apparatus is provided to improve the test accuracy by minimizing the practical circuit area. CONSTITUTION: The amplifier circuit(30) installed at each sensor circuit comprises the amplification MOS transistor, and the diode transistor block(32) for the diode transistor block(31) for the negative feedback source impedance and the load. The gate of the amplification MOS transistor is used as the input terminal of the amplifier circuit. The diode transistor block for the negative feedback source impedance is connected to the source of the amplification MOS transistor. The diode transistor block for the load is connected to the drain of the amplification MOS transistor. The voltage output port is connected among the diode transistor block for the load to the drain of the amplification unipolar transistor.

Description

Sensor Substrate and Inspection Apparatus}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor substrate and an inspection apparatus. For example, the present invention can be applied to a sensor substrate used for inspection of a display substrate such as a glass substrate of a liquid crystal display panel, or an inspection apparatus including the sensor substrate as a component. It can be.

The display substrate is, for example, a plurality of glass substrates provided on one surface with a plurality of display substrate regions, each of which is divided into a liquid crystal display panel. As shown in FIG. 39, each display substrate region 1 has a plurality of pixel regions (i.e., a plurality of pixel regions each having a rectangular pixel electrode 2 and a switching element 3 connected to the pixel electrode 2). Cell region) in matrix form.

Each pixel electrode 2 is a thin film-like electrode parallel to the display substrate 1 and has, for example, a rectangular planar shape having substantially the same size as the corresponding pixel region. Each switching element 3 is, for example, a field effect thin film transistor having a source, a drain, and a gate, and has a drain (or source) corresponding to the pixel electrode 2. Connected. The gate of the switching element 3 aligned in the X direction is connected to the common gate wiring 4, and the source (or drain) of the switching element 3 aligned in the Y direction is connected to the common wiring 5. Connected.

By controlling the voltage of the gate wiring 4, the switching element 3 of the corresponding column is turned on and the test high frequency signal is supplied to the wiring 5, so that the pixel electrodes of the corresponding column By charging / discharging (2) or the like, disconnection of the switching element 3, the gate wiring 4, the wiring 5, and the like can be detected. For example, 7168 pixel electrodes 2 are arranged in parallel in the X direction (in one row), and inspection such as disconnection is performed for each row. The line in the X direction has a length slightly over 25 cm, for example.

Patent Literature 1 describes an inspection apparatus for facing and inspecting a sensor substrate without contacting a column of the pixel electrode 2 to be inspected.

Fig. 40 shows a schematic configuration of such an inspection apparatus, and Fig. 41 shows a schematic plane of the sensor substrate.

On the sensor substrate 6, the sensor electrodes 7 which face the pixel electrodes 2 one-to-one are aligned at the same pitch as the arrangement of the pixel electrodes 2 in the X-direction. At a non-contact distance such that the pixel electrode 2 and the corresponding sensor electrode 7 are electromagnetically coupled, the sensor substrate 6 is brought close to the column of the pixel electrode 2 to be inspected, and the pixel electrode 2 The sensor electrode 7 picks up the signal emitted from the sensor (a test high frequency signal, etc. described above) and performs amplification or rectification through a corresponding sensor circuit 8 (see FIG. 8 of Patent Document 1). Inspect the tester 11 to check the presence of a signal through the flat cable 10. The sensor circuit 8 includes an amplifying circuit, and in some cases, a rectifier circuit or the like may be further added.

The inspection apparatus 12 includes an inspection heat variable mechanism 13 which relatively conveys the display substrate 1 and the sensor substrate 6 while maintaining them in a non-contact manner, and controls the control unit 14. In the following, each column of the pixel electrode 2 is inspected in turn while moving the display substrate 1 and the sensor substrate 6 intermittently and relatively in accordance with the pitch of the pixel electrode 2 in the Y direction.

For example, as described above, since the pixel electrodes 2 are provided in parallel with 7168 pieces in a little longer than 25 cm, the sensor circuit 8 formed on the sensor substrate 6 is also, for example, It is necessary to install 7168 in parallel with a length of just over 25cm. For this reason, it is practical to configure the amplification circuit in the sensor circuit 8 by SOG (polysilicon), and this amplification circuit has a high input impedance in order to become a microcapacitive coupling input, and can be arranged in parallel in many cases. Even if there is an irregularity in the characteristics of the device or a drop in power supply voltage caused by a long supply line resistance of more than 25 cm, even if the amplifier characteristics (gain, output bias, etc.) are uniform, the actual circuit area in the case of ICization is small. It is required to have an area, and for example, the use of the source ground amplifier circuit shown in Fig. 42 for each amplifier circuit has been studied.

In Fig. 42, the source ground amplifier circuit 20 is provided between the source and the negative power supply Vee of the amplified MOS transistor M1 connecting a gate to the input terminal Vi of the source ground amplifier circuit 20. The negative source feedback resistor Rs is connected to the load resistor, and the load resistor RL is connected between the drain of the MOS transistor M1 and the positive power supply Vdd. The drain connection terminal of the amplifying MOS transistor M1 of RL is configured as the output terminal Vo of this source ground amplifier circuit 20. The input terminal Vi of the source ground amplifier circuit 20 is connected to the output Vso of the signal source 22. Fig. 42 shows the signal picked up by the sensor electrode 7 described above as a signal from the signal source 22, and shows the signal source 22 in an equivalent circuit. The signal source 22 connects the input DC bias power source Vidc and the input AC signal source Vs in series, connects one end of the series circuit to the ground, and the other end to the signal source output Vso. It is set as the structure. In addition, any one of the electrostatic source Vdd, the negative power source Vee, and the input DC bias power source Vidc of the signal source 22 may be connected to the OV (that is, the grand).

In the source ground amplifier circuit 20, since the gate of the MOS transistor M1 is the input terminal Vi of the source ground amplifier circuit 20, no current flows through the input terminal Vi.

On the other hand, the DC current difference between the input terminal Vi and the negative power supply Vee divided by the sum of the DC source resistance of the MOS transistor M1 and the negative feedback source resistance Rs is the MOS transistor M1. AC current (signal current) that flows through the source and the drain of the s) and is divided by the sum of the voltage of the input AC signal source Vs divided by the sum of the AC source impedance of the MOS transistor M1 and the negative feedback source resistance Rs. ) Flows through the source and the drain of the MOS transistor M1.

The product of the drain AC current (output signal current) and the load resistance RL becomes an output voltage.

From the above, the voltage gain A when the input impedance of the rear end circuit connected to the output Vo of the source ground amplifying circuit 20 is infinite is expressed as the AC source impedance of the MOS transistor M1 is RM1s. It can be represented by (1).

A = RL / (RM1s + Rs). (One)

In the case of RM1s_Rs, the irregularity of the source impedance RM1s of the amplified MOS transistor M1 is directly connected to the gain irregularity.

Here, if RM1s is sufficiently smaller than Rs, equation (2) holds, but in general, RM1s cannot be ignored and is treated as equation (1).

A ≒ RL / Rs… (2)

Patent Document 1: Japanese Patent Application Publication No. 2007-248202

However, the voltage gain represented by Equation (1) of the conventional source ground amplifier circuit 20 can be obtained even if the sensor substrate 16 is made by applying IC technology or the like to match the resistance ratio in the circuit. Source impedance RM1s and Rs, RL are irregular because they change independently of each other.

When the operating current is set to I, the source impedance RM1s of the amplified MOS transistor M1 changes by 1 / √I, and the load resistance RL and the negative feedback source resistance Rs are 1 / I. To change. Therefore, in order to ignore the source impedance RM1s and determine the voltage gain by the ratio of the load resistance RL and the negative feedback source resistance Rs, it is necessary to make the operating current I small.

When the operating current I is made small and the load resistance RL and the negative feedback source resistor Rs are made large, the time constants between the drains and the gate capacitances of these resistors Rs and RL and the amplified MOS transistor M1 are increased. It becomes large and the high frequency characteristic as an amplifier circuit worsens. In addition, the large resistance increases the chip area when ICized.

For this reason, the amplification circuit mounted on the sensor substrate 6 operates with an operating current capable of ensuring the high frequency characteristics of the amplifying circuit, and causes irregularities in the source impedance of the amplifying transistor (threshold voltage of the amplifying transistor). Irregularity) does not affect the voltage gain irregularity, and amplification circuit having good linearity is required.

In the sensor substrate 6, it is required to connect a plurality of conventional source ground amplifier circuits 20 in parallel between the same power supply lines. In this case, the power supply voltage of the source ground amplification circuit 20 at a position away from the power supply electrode decreases due to the current of the power supply line and the resistance of the power supply line, and the voltage of the source ground amplification circuit 20 at the position is reduced. The gain fluctuates. That is, depending on the position provided on the sensor substrate 60, even if the source ground amplifier circuit 20 intended for the same configuration is different, the voltage gain is different.

For this reason, as the amplifier circuit mounted on the sensor substrate 6, even if such a drop in the power supply voltage occurs, the voltage gain does not change and the amplification circuit with good linearity is demanded.

In the existing SOG process, there is no resistance generation process, and when the source ground amplifier circuit 20 including the resistance element is applied to the amplification circuit in the sensor circuit, it is necessary to add a resistance generation process, and increase the mask and increase the process. This results in an increase in the cost of the sensor substrate.

For this reason, the amplification circuit mounted on the sensor substrate can be configured without using a resistance element, and at the same time, it is required to realize an amplification circuit having good linearity.

That is, an amplifier circuit with significantly better characteristics and the like than a conventional amplifier circuit is mounted, and as a result, the realization of a sensor substrate and an inspection apparatus capable of performing a test with higher precision than the conventional amplifier is required.

The first aspect of the present invention provides a sensor substrate in which the electrodes to be inspected are arranged in a matrix so as to be electromagnetically coupled without touching the substrates to be driven one row at a time, the aligned sensor electrodes and the capture signals of the respective sensor electrodes. A sensor substrate having a sensor circuit corresponding to each sensor electrode, which amplifies at least a voltage, the amplification circuit provided in each sensor circuit includes (1) an amplified unipolar transistor whose gate is an input terminal of the amplification circuit. And (2) connected to the source side of the amplified unipolar transistor, which is formed by connecting the gate and the drain to make a diode between the drain and the source, in series / parallel connection with a finite number (including zero). (3) A gate and a drain are connected to each other for the negative feedback source A diode for a load diode diode transistor connected to the drain side of the amplified unipolar transistor, configured by directly / parallel connecting a diode-ized unipolar transistor made of a diode, and (4) the diode of the load diode diode transistor, A voltage output terminal connected to the drain end of the amplified unipolar transistor; (5) an impedance of the sum of the impedance of the source impedance of the amplified unipolar transistor, the impedance of the diode feedback transistor block for the negative feedback source impedance, and the load diode; The voltage gain is determined by the ratio of the impedance of the transistor block.

According to a second aspect of the present invention, there is provided a sensor substrate in which the electrodes to be inspected are arranged in a matrix so as to be electromagnetically coupled without being in contact with the substrates to be driven one row at a time, the aligned sensor electrodes and the capture signals of the respective sensor electrodes. A sensor substrate having a sensor circuit corresponding to each sensor electrode, which amplifies at least a voltage, the amplification circuit provided in each sensor circuit includes (1) one gate of the amplification circuit in a positive phase. a first and second differential amplifying unipolar transistors having a second input terminal and a second gate as a negative phase sequence input terminal of the amplifier circuit, and (2) the first and second input terminals. (2) A suction constant current source in which the sum of the source currents of the differential amplified unipolar transistors is a constant current, and (3) a gate and a drain are connected to form a diode between the drain and the source. A diodeization transistor block for first and second negative feedback source impedances connected to the source side of the first and second differentially amplified unipolar transistors, configured by directly / parallel connecting diode diodes (including zero); (4) a first connected to the drain side of the first and second differentially amplified unipolar transistors configured by connecting a gate and a drain to diodes between the drain and the source by a series of finite series / parallel connections; And a second output diode block and (5) a normal output terminal on one side of the drain end of the first and second differential amplifying unipolar transistors of the first and second load diode diode transistor blocks, and the other. (6) each source impedance of the first and second differentially amplified unipolar transistors, and the first and second And each agreement impedance of each the impedance of the feedback source impedance diode Chemistry transistor blocks, the first characterized in that in a first configuration and a voltage gain determined by the ratio of the impedance of each second diode screen load transistor blocks.

The third aspect of the present invention provides a sensor substrate in which the inspection target electrodes are arranged in a matrix so as to face each other so as to be electromagnetically coupled without contacting the inspection target substrate that can be driven one by one, the aligned sensor electrodes and the capture signals of the respective sensor electrodes. In a sensor substrate having a sensor circuit corresponding to each sensor electrode that amplifies at least, the amplification circuits provided in the respective sensor circuits each have (1-1) one gate as a normal input terminal of the amplification circuit. At the same time, the first and second differential amplifying unipolar transistors whose other gates are the reverse phase input terminals of the amplifier circuit, and (1-2) the first and second differential amplifying unipolar transistors are connected to the source side of the first and second differential amplifying unipolar transistors. First and second negative feedback source resistors, (1-3) first and second load resistors connected to the drain side of the first and second differential amplified unipolar transistors, and (1-4) the first and second negative feedback resistors. 2nd load lower (1) a differential amplifier having a normal output terminal on one side of the drain end of the first and second differential amplifying unipolar transistors and a reverse phase output terminal on the other side, and (2) the normal output terminal and the reverse phase. An additional circuit having first and second source follow unipolar transistors having gates connected to their respective output terminals, and (3) a suction constant current source having a sum of source currents of the first and second differential amplified unipolar transistors as a constant current; And (4) a power supply level shift diode transistor for shifting the power supply level to the differential amplifier, (5) to change the threshold voltage of the differential amplifier and the unipolar transistor in the additional circuit. And a function of output DC bias voltage compensation for the constant current source and the power supply level shift diode transistor.

In a fourth aspect of the present invention, a sensor substrate having an aligned sensor electrode and a sensor circuit corresponding to each sensor electrode for at least amplifying a capture signal of each sensor electrode is arranged in a matrix form. An inspection in which the inspection target substrate that can be driven by rows is opposed to each other so as to be electromagnetically coupled without contact, and that the inspection target substrate is inspected by electromagnetically coupling the inspection electrode of any row of the inspection substrate with the sensor electrode on the sensor substrate. The apparatus is characterized in that the sensor substrate of any one of the first to third inventions is applied as the sensor substrate.

According to the present invention, it is possible to reduce the irregularity of the amplification gain of the amplification circuit and the irregularity of the output DC bias voltage due to the securing of high input impedance, the irregularity of the threshold value of the unipolar transistor and the decrease of the power supply line resistance power supply voltage. By applying an amplification circuit capable of making a small area of the actual circuit area at the time of being converted, it is possible to provide a sensor board and an inspection device capable of improving inspection accuracy.

(A) First embodiment

EMBODIMENT OF THE INVENTION Hereinafter, 1st Embodiment of the sensor substrate and inspection apparatus which concern on this invention is described, referring drawings.

(A-1) Configuration of First Embodiment

The schematic configuration of the sensor substrate and the inspection device of the first embodiment is the same as that of the conventional configuration shown in Figs. However, the amplifier circuit provided in the sensor circuit 8 differs from the conventional one.

Fig. 1 is a circuit diagram showing the configuration of the source ground amplifier circuit according to the first embodiment, in which the same and corresponding parts as in the above-described drawings are denoted by the same and corresponding reference numerals.

In Fig. 1, the source ground amplifier circuit 30 of the first embodiment includes an amplifying MOS transistor M1 and a diode transistor transistor block for negative feedback source impedance (hereinafter referred to as a diode impedance transistor block for source impedance). 31 and a load diode diode transistor 32.

The source impedance diode transistor 31 is provided in place of the negative feedback source resistor Rs in the conventional source ground amplifier circuit (see FIG. 40). The source impedance diode diode transistor 31 connects the gate and the drain to form a diode between the drain and the source by a finite number (including zero) of the diode transistors. In Fig. 1, only one diode transistor is shown, but in the case of two or more diodes, these may be connected in series, or may be connected in parallel. Furthermore, a plurality of series circuits may be formed to connect these series circuits in parallel. In addition, since a plurality of parallel circuits may be formed and these parallel circuits may be connected in series, the connection method of the plurality of diode-ized transistors may be arbitrarily selected. / Parallel connection.

The load diode diode transistor 32 is provided in place of the load resistor RL in the conventional source ground amplifier circuit (see FIG. 42). The load diode diode transistor 32 is formed by connecting a gate and a drain to a diode between the drain and the source by a finite number of series / parallel connections.

In Fig. 1, a diode impedance transistor 31 for source impedance shows that one diode transistor Ms is connected between the source of the amplified MOS transistor M1 and the negative power supply Vee, and is used for the load. As the diode transistor 32, five diode transistors ML1 to ML5 are connected in series between the drain of the amplifying MOS transistor M1 and the electrostatic source Vdd.

The drain connection terminal of the amplified MOS transistor M1 of the load diode diode transistor 32 is the output terminal Vo of the source ground amplifier circuit of the first embodiment.

(A-2) Operation of the First Embodiment

The operation of the sensor substrate and the inspection apparatus of the first embodiment is the same as that of the conventional sensor substrate and the inspection apparatus.

The source ground amplifier circuit 30 of the first embodiment is provided with a source impedance diodeizing transistor block 31 in place of the negative feedback source resistor Rs in the conventional source ground amplifier circuit (see FIG. 42). The load diode diode transistor 32 is provided in place of the load resistor RL in the conventional source ground amplifier circuit. The basic operation of the source ground amplifier circuit 30 of the first embodiment is a conventional source. Since the operation is the same as that of the ground amplifying circuit, the description thereof is omitted.

Regarding the gain characteristics, the negative feedback source resistor Rs of Equation (1) described above is replaced with the impedance of the negative feedback source diode diode transistor 31, and the load resistor RL is replaced. It can be calculated by substituting the impedance of the load diode diode transistor 32.

The voltage gain A when the input resistance of the rear end circuit connected to the output of the source ground amplifier circuit 30 of the first embodiment is infinite, the source impedance of the amplified MOS transistor M1 is RM1s, Impedance per one diode diode in the diode diode block 31 for impedance is RMs, and the number of transistor series connection in the diode diode block 31 for source impedance is m (= 1), and diode diode for a load is used. Impedance per R diode in the block 32 is set to RML, and the number of transistor series connections in the load diode forming transistor block 32 is set to n (= 5), and the respective parameters of Equation (1) described above are replaced. Then, equation (3) can be obtained.

A = RML × n / (RM1s + RMs × m). (3)

Here, when the gate widths and gate lengths of the transistors Ms and ML1 to ML5 constituting the amplified MOS transistor M1, the source impedance diodeizing transistor block 31 and the load diodeizing transistor block 32 are the same, Since RML = RMs? RM1s, equation (4) can be obtained from equation (3).

A ≒ n / (1 + m)... (4)

In Equation (4), when n > (1 + m), it can be seen that the voltage gain A becomes greater than 1, resulting in voltage amplification operation. When the source impedance diodeizing transistor block 31 and the load diodeizing transistor block 32 are each constituted by a series circuit of a diode transistor, the voltage gain is determined by selecting the number of series connections m and n. It can be seen that A can be defined.

Under the condition that the transistor sizes described above are the same, the potential difference between the DC bias voltage of the electrostatic source Vdd and the output Vo of the source ground amplifier circuit 30 and the input voltage Vi of the source ground amplifier circuit 30 are adjusted. Since the ratio of the potential difference between the included input DC bias power supply Vidc and the negative power supply Vee becomes equal to equation (4), if the voltage of the input DC bias power supply Vidc does not fluctuate, the MOS transistors Ms and ML1 to ML5 Even if the threshold voltage (Vt) of Fig. 2 varies, the DC bias voltage of the output Vo of the source ground amplifier circuit does not change.

In general, if the gate width of the MOS transistor is W, the gate length is L, the voltage between gate and source is Vgs, the threshold voltage is Vt, and the proportional constant k is substituted, the drain current I in saturation operation is expressed by Equation (5). ) Can be represented by (** 2 represents a power of 2).

I ≒ (kW / L) × (Vgs-Vt) ** 2. (5)

Partial derivative of Eq. (5) by Vgs yields transfer conductance (Gm). The inverse of the transfer conductance Gm becomes the source impedance.

The source impedance RM1s of the amplified MOS transistor M1 is expressed by equation (6) when the gate width of the amplified MOS transistor M1 is set to Ws1 and the gate length is Ls1, and a new proportional constant K is substituted.

RM1 s ≒ (K / √I) × √ (Ls1 / Ws1). (6)

For example, when the gate and the drain of the amplified MOS transistor M1 are connected to form a diode, the value calculated in equation (6) becomes the diode impedance.

Similarly, the diode impedance RMs of the MOS transistor Ms in the source impedance diode transistor block 31 can be expressed by equation (7) when the gate width of the MOS transistor Ms is Ws and the gate length is Ls. have. Similarly, in the diode impedance RML of the transistors ML1 to ML5 in the load diode diode transistor 32, the gate width of each of the MOS transistors ML1 to ML5 is WL and the gate length is LL. )

RMs ≒ (K / √I) × √ (Ls / Ws). (7)

RML ≒ (K / √I) × √ (LL / WL). (8)

Substituting the results of equations (6) to (8) into equation (3) eliminates the term (K / √ (I)), yielding equation (9), and gain A is the threshold value of each MOS transistor. It can be seen that the ratio of the gate size and the number of each MOS transistor is not affected by the voltage Vt or the bias current.

A = n × √ (LL / WL) / (√ (Ls1 / Ws1) + m × √ (Ls / Ws)). (9)

For example, in the case of a reversed-phase output amplifier using an operational amplifier (Op Amp), although the gain determining negative feedback resistor lowers the input impedance as the amplifier circuit, the source ground amplifier circuit 30 of the first embodiment is used. In this case, since the input impedance is the gate input impedance of the MOS transistor M1, the input impedance as the amplifying circuit can be maintained at high impedance.

Since the diode impedance described above is a value at the time of saturation operation of each MOS transistor, within the operating range where each MOS transistor can be regarded as a saturation operation, expressions (3) to (9) are always used at each instant of the AC signal input operation. ) Is established and linearity is secured so that waveform distortion is not caused.

In addition, when the diode voltage in the source impedance diodeizing transistor block 31 and the load diodeizing transistor block 32 is taken large, the variation of the operating current I with respect to the variation of the threshold voltage Vt of each MOS transistor is small. In addition, the output voltage range in which the linearity is ensured is expanded.

Furthermore, if the size of each MOS transistor is the same so that the gain A is determined in equation (4), the potential difference between the voltage of the DC bias power source Vidc and the negative power source Vee included in the input signal source, and the electrostatic source Vdd. ) And the ratio of the potential difference between the direct current bias of the output voltage Vo is equal, so that the direct current bias of the output voltage Vo does not change even if the threshold voltage Vt of the transistor changes.

When applied to the sensor substrate described above, since only an AC signal is received from the sensor in the form of microcapacitance coupling to the input terminal Vi, a high resistance (for example, a positive input DC bias power supply Vidc) is obtained. For example, a direct current bias is supplied to the input terminal Vi through the MOS resistor to operate (for example, the format shown in FIG. 27 described later).

(A-3) Effect of 1st Embodiment

According to the source ground amplifier circuit 30 of the first embodiment, the following effects (a) to (i) can be brought about. As a result, according to the sensor substrate and the inspection apparatus of the first embodiment, the present invention is more accurate than the conventional one. The inspection of Fig. Can be performed.

(a) The source ground amplifier circuit can be realized whose gain is not affected by the threshold voltage Vt of each MOS transistor or the MOS transistor operating current, and is determined by the ratio of the gate size and the number of transistors of each MOS transistor.

For example, in the case of an amplification circuit formed on a sensor substrate in parallel with a length of just over 25 cm in length, even if the source ground amplifier circuit is generated by the same ICization process, depending on the position on the sensor substrate, The threshold voltage Vt of the MOS transistor may be slightly different. However, since the gain is not affected by the threshold voltages Vt of the respective MOS transistors, it is possible to match the gain of the amplifier circuits installed in parallel.

(b) Since the input impedance is the gate input impedance of the MOS transistor, the input impedance as the amplifier circuit can be maintained at high impedance.

(c) Although diode impedance is used, linearity is ensured and waveform distortion is not caused within the operating range where each MOS transistor can be regarded as a saturation operation.

(d) By matching the structure of the load and source impedance MOS transistors, the ratio of load impedance and source impedance from low frequency to high frequency does not change, and flat gain characteristics can be obtained from low frequency to high frequency.

(e) Since the loop negative feedback circuit from the output to the input, such as an operational amplifier circuit, is unnecessary, there is no fear of oscillation.

(f) Since the loop negative feedback circuit from the output to the input is unnecessary, the bias voltage at the input portion and the bias voltage at the output portion can be set to free values.

(g) Since the circuit can be composed of a single type of MOS transistor of type N (or P), and does not use a resistor, the transistor generation process of any of the type P (or N) in the case of ICization. An over-resistance generation step becomes unnecessary, and the manufacturing cost can be reduced and the short delivery time can be achieved.

(h) Since a resistor that requires a larger area than MOS transistors is not used, when IC is used, a small area can be achieved (miniaturized) compared to a source ground amplifier circuit using a conventional resistor.

(i) The gate width and gate length of the transistors constituting the amplified MOS transistor M1, the source impedance diodeizing transistor block 31 and the load diodeizing transistor block 32 are the same, and the electrostatic source Vdd The threshold voltage Vt of the MOS transistor is changed by setting the input DC bias power supply Vidc and the negative power supply Vee included in the input voltage Vi of the source ground amplifier circuit 30 to a fixed value (no change). Even if the source ground amplifier circuit of the output Vo does not fluctuate, it can be realized.

The ratio of the potential difference between the electrostatic source and the output terminal Vo of each source ground amplifier circuit 30 and the potential difference between the input terminal Vi and the negative power supply terminal is determined by the ratio of the number and size of transistors in each transistor block. As shown schematically in Fig. 2, the source ground amplifier circuit 30 according to the first embodiment of the present invention is connected in parallel between the electrostatic source Vdd line and the sub power supply line Vee, and the source ground amplifiers are amplified. The ratio of the power line resistances of the electrostatic source terminal and the electrostatic source (Vdd) connection terminal of the circuit 30 and the power line resistances of the sub power supply terminal and the sub power supply (Vee) connection terminal of each source ground amplifying circuit 30 to each other. Is a ratio of the number and size of transistors in the transistor block described above (when the ratio of power line length / power line width is set), the current flowing in the drain of the MOS transistor M1 of this source ground amplifier circuit (constant power supply). From (Vdd) ) And the current flowing through the source (the current flowing through the negative power supply (Vee)) are the same, so that the power line voltage drop from the electrostatic source (Vdd) connection terminal to the electrostatic source terminal of each source ground amplifier circuit 30, and each source The ratio of the voltage drop of the power line from the sub power supply terminal of the ground amplifier circuit 30 to the sub power supply connection terminal is equal to the ratio of the number of transistors and the size described above. The voltage drop to the output terminal Vo of the source ground amplification circuit 30, and the negative power supply Vee at the input terminal Vi (connected to the positive input DC bias power supply Vidc) of each source ground amplification circuit 30, respectively. The input terminal Vi, which is equal to the ratio of the number and size of transistors described above, is the gate of the MOS transistor M1, and the DC bias current is applied to the power supply line of the positive input DC bias power supply Vidc. Does not flow The potential of the input terminal Vi of each source ground amplifying circuit 30 connected to this power supply line is constant, and as a result, the potential of the output terminal Vo of each source ground amplifying circuit 30 is kept constant. do.

Connecting the power supply capacity between an appropriate position and a gland in the middle of each power supply line so that each power supply line resistance does not affect the AC gain results in a match between the voltage gain and the output bias voltage.

(B) Second Embodiment

Next, a second embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. Since the second embodiment differs from the first embodiment only in the amplification circuit in the sensor circuit 8, the amplification circuit in the second embodiment will be described below.

Fig. 3 is a circuit diagram showing the configuration of the source ground amplifier circuit according to the second embodiment, in which the same and corresponding parts are denoted by the same and corresponding parts as in the above-described drawings.

In Fig. 3, the source ground amplifier circuit 30A according to the second embodiment includes the drain of the amplified MOS transistor M1 and the output terminal Vo in the source ground amplifier circuit 30 according to the first embodiment described above. ), And the connection with the load diode diode transistor 32, and the P-channel current mirror circuit 33 for connecting the common terminal to the electrostatic source Vdd is added. The drain of the amplified MOS transistor M1 is connected to the input of the current mirror circuit 33, and the load diode diode transistor 32 is provided between the output of the current mirror circuit 33 and the second sub power source Vee1. Is connected to the current mirror circuit 33 of the load diode diode transistor 32 as the output terminal Vo of the source ground amplifier circuit 30A.

Although the specific configuration of the current mirror circuit 33 of the P-channel is arbitrary, an example is shown in FIG. The current mirror circuit 33 connects each source of the P-channel current mirror current reference MOS transistor Mpm and the P-channel current mirror current output MOS transistor Mpm1 to be a common terminal, and the P-channel current mirror current reference MOS transistor. The drain and gate of Mpm are connected to the input terminal of the P-channel current mirror circuit 33, and the drain of the P-channel current mirror current output MOS transistor Mpm1 that connects the gate to this input terminal is connected to the current mirror circuit ( It is configured as an output terminal of 33).

In the source ground amplifying circuit 30A according to the second embodiment, the drain output current of the amplified MOS transistor M1 is returned from the current mirror circuit 33 toward the second sub power source Vee1, whereby the source ground amplifying circuit 30A. The DC bias potential of the output terminal Vo of 30A is changed, and the polarity of the AC signal of this output terminal Vo is inverted.

In the source ground amplifier circuit 30A according to the second embodiment, current amplification is possible by the P-channel current mirror circuit 33, and if the current magnification is k, each MOS in the load diode diode transistor 32 The diode impedance RML of the transistors ML1 to ML5 is 1 / √k, and the gain A is √k times by the current magnification k. That is, the gain A of the source ground amplifier circuit 30A according to the second embodiment can be expressed by equation (10) instead of equation (9) described above.

A = √k × n × √ (LL / WL) / (√ (Ls1 / Ws1) + m × √ (Ls / Ws)). 10

Also in the second embodiment, the same effects as in the first embodiment can be obtained.

(C) Third Embodiment

Next, a third embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. Since the third embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, the amplification circuit in the third embodiment will be described below.

Fig. 4 is a circuit diagram showing the configuration of the amplifier circuit according to the third embodiment, in which the same and corresponding parts are denoted by the same and corresponding parts as in the above-described drawings.

In Fig. 4, the amplifier circuit of the third embodiment adds a source follower / rectifier circuit 34 that functions as a source follow circuit or a rectifier circuit to the source ground amplifier circuit 30B. Further, the source follower / rectifier circuit 34 functioning as a source follower circuit or rectifier circuit may be added to the source ground amplifier circuit 30 of the first embodiment or the source ground amplifier circuit 30A of the second embodiment. do.

The source ground amplifier circuit 30B of the third embodiment has the following differences and commonalities with respect to the source ground amplifier circuit 30 of the first embodiment.

In the source ground amplifier circuit 30B of the third embodiment, the drain of the amplified MOS transistor M1 and the output terminal Vo in the source ground amplifier circuit 30 of the first embodiment are disconnected, and the output terminal Vo is disconnected. (Vo) is connected to the drain of the cascode connected MOS transistor M2, the gate of the cascode connected MOS transistor M2 is connected to the cascode gate bias power supply Vb, and this cascode connected MOS The source of the transistor M2 is connected to the drain of the amplifying MOS transistor M1, and a high pass compensation capacitor (hereinafter referred to as a high pass compensation capacitor) Cp between the source and the ground of the amplifying MOS transistor M1 (Cp) ( A high pass cut capacitor (hereinafter referred to as a high pass cut capacitor) CL (including a capacitor 0) is connected between the output terminal Vo and the ground.

Here, the high-pass compensation capacitor Cp may be connected to the terminal of any one of the diode transistors in the source impedance diode transistor block 31 in addition to the connection point described above. You may be connected to the terminal of any one diode in the load diodeization transistor block 32. The high pass compensation characteristic and the high pass cut characteristic change according to the connection position and the capacitance value of the capacitance.

The operation of the source ground amplifier circuit 30B of the third embodiment is basically the same as the source ground amplifier circuit 30 of the first embodiment. However, in the source ground amplifier circuit 30B of the third embodiment, the impedance for calculating the load diode diode transistor 32 from the drain of the amplified MOS transistor M1 is the source impedance of the cascode MOS transistor M2. Since the source impedance is set smaller than the impedance RML × n of the load diode diode transistor 32, the deterioration of the high frequency characteristic due to the mirror capacitance effect of the amplified MOS transistor M1 can be improved. .

When the mirror capacitance effect of the amplified MOS transistor M1 is not a problem, it is not necessary to add the cascode MOS transistor M2. The cascode MOS transistor M2 may be added to the source ground amplifier circuit 30 of the first embodiment and the source ground amplifier circuit 30A of the second embodiment described above.

In the source ground amplifier circuit 30B of the third embodiment, the amplified MOS transistor M1 in the frequency region equal to or greater than the time constant by the impedance RMs × m of the high-pass compensation capacitor Cp and the source impedance diodeizing transistor block 31. The AC impedance connected to the source side of the C) decreases and the voltage gain increases. By appropriately setting the time constant, it is possible to compensate for a decrease in gain on the high frequency side.

Here, if the impedance RMs × m of the source impedance diodeizing transistor block 31 is set to be sufficiently larger than the source impedance RM1s of the amplified MOS transistor M1, the time constant determined by Cp and RMs × m or less In frequency, equation (11) holds, and at a frequency equal to or greater than the time constant determined by Cp and RM1s, equation (12) holds, and the time constant determined by Cp and RMs × m is a 1 / f noise region. If set near, this 1 / f noise can be reduced.

A ≒ RML x n / RMs x m. (11)

A ≒ RML x n / RM1s. (12)

In addition, since the low pass filter (LPF) is formed by the high pass cut capacity CL and the impedance RML x n of the load diode diode transistor 32, an unnecessary high pass frequency is set by appropriately setting the time constant. The component (noise) can be removed.

In addition, when the high frequency compensation is unnecessary, the high frequency compensation capacitor Cp may be omitted, or when the high frequency cut is unnecessary, the high frequency cut capacitor CL may be omitted. The high frequency compensation capacitor Cp and the high frequency cut capacitor CL may be added to the source ground amplifier circuit 30 of the first embodiment and the source ground amplifier circuit 30A of the second embodiment described above.

In addition, in order to reduce the variation in the DC bias current I with respect to the variation in the threshold voltage Vt of the MOS transistor, the number of MOS transistors m in the source impedance diode transistor transistor 31 is increased to increase the number of MOS transistors m. Correspondingly, the voltage between the input DC bias power supply Vidc and the negative power supply Vee included in the input voltage Vi of the source ground amplifier circuit 30B may be increased.

Increasing the number of MOS transistors m in the source impedance diode transistor block 31 decreases the gain, so that the high-pass compensation capacitor Cp is a capacitance value sufficiently low in the pass signal region, so that the diode impedance transistor block for source impedance ( When the connection position of the capacitor in 31) is a position where the gain can be secured, the fluctuation of the DC bias current I with respect to the fluctuation of the threshold voltage Vt of the MOS transistor can be suppressed and the gain can be secured.

The input terminal Vi1 of the source follower / rectifier circuit 34 is connected to the output Vo of the source ground amplifier circuit 30B of the third embodiment.

The source follower / rectifier circuit 34, which functions as a source follower or rectifier circuit, removes the drain of the source follower MOS transistor M3 that connects the gate to the input terminal Vi1 of the source follower / rectifier circuit 34. 2 is connected to the electrostatic source (Vdd1), the source follow load constant current source (Ida) and the voltage holding element (hereinafter referred to as "voltage holding capacitance") between the source and the ground of the source follow MOS transistor M3 (Ch) Are connected in parallel, and the source of the source follow MOS transistor M3 is configured to be the output Vo1 of the source follow and rectifier circuit 34. In addition, one of the source follow load constant current source Ida and the voltage holding capacitance Ch may be set to zero. The source follow load constant current source Ida may be replaced with a fixed resistor.

The source follower / rectifier circuit 34 is a voltage buffer with high input impedance and low output impedance when the constant current Ida through which the source follower load constant current source Ida flows is sufficiently large and the voltage holding capacity Ch is sufficiently small. It operates as a circuit (source follower circuit) and has a level shift circuit function of shifting a direct current potential.

On the contrary, when the constant current Ida through which the source follow load constant current source Ida flows is small enough and the voltage holding capacity Ch is large enough, it becomes a peak hold circuit with a high input impedance.

When the magnitude of the constant current Ida and the value of the voltage holding capacity Ch that the source follow load constant current source Ida flows are properly selected, the output Vo1 of the source follow and rectification circuit 34 becomes a signal source. According to the envelope of the amplitude peak value of the AC signal of the (source ground amplifier circuit 30B of the third embodiment), the same operation as that of the detection circuit of the AM modulated signal is performed.

According to the amplifying circuit according to the third embodiment, the same effects as in the amplifying circuit (source ground amplifier circuit 30) according to the first embodiment can be obtained. Furthermore, the following effects (a) to (e) As a result, according to the sensor substrate and the inspection apparatus of the third embodiment, the inspection can be performed with higher accuracy than before.

(a) By providing the cascode MOS transistor M2, deterioration of the high frequency characteristic can be improved.

(b) By providing the high pass compensation capacitor Cp, the lowering of the gain in the high pass can be compensated.

(c) By providing the high cut capacity CL, unnecessary high frequency components (noise) can be removed.

(d) The number of MOS transistors m in the source impedance diode transistor block 31 is increased, and the high frequency compensation capacitor Cp is a capacitance value that is sufficiently low impedance in the pass signal region, and the diode impedance transistor block 31 for source impedance is obtained. By setting the connection position of the capacitor in the position where the gain can be ensured, the variation of the DC bias current I with respect to the variation of the threshold voltage Vt of the MOS transistor can be suppressed and the gain can be ensured.

(e) By providing the source follower / rectifier circuit 34, it is possible to appropriately select a signal waveform or the like to the tester section.

(D) 4th Embodiment

Next, a fourth embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. Since the fourth embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, the amplification circuit in the fourth embodiment will be described below. The amplifier circuit of the fourth embodiment is a transistor differential amplifier circuit (hereinafter, simply referred to as a "differential amplifier circuit").

(D-1) Configuration of Fourth Embodiment

Fig. 5 is a circuit diagram showing the configuration of the differential amplifier circuit according to the fourth embodiment, in which the same and corresponding parts are denoted by the same and corresponding parts as in the above-described drawings.

In Fig. 5, an unbalanced signal is input from the unbalanced differential signal source 25 to the differential amplifier circuit 40 of the fourth embodiment. In Fig. 5, the signal source 25 is shown by an equivalent circuit.

The signal source 25 connects the input DC bias power source Vidc and the input AC signal source Vs in series, connects one end to the gland, and connects the other end to the positive end of the signal source 25. At the same time as the output Vsop, the output of the input DC bias power supply Vidc described above is used as the negative output Vson of the signal source 25.

The differential amplifier circuit 40 of the fourth embodiment includes a source of the first differentially amplified MOS transistor M1a whose gate is the normal input terminal Vip of the differential amplifier circuit 40, and the suction constant current source Is. The first source impedance diodeization transistor block 41a is connected therebetween, and the first load diodeization transistor block 42a is connected between the drain of the first differentially amplified MOS transistor M1a and the electrostatic source Vdd. The second source impedance is connected between the source of the second differentially amplified MOS transistor M1b and the suction constant current source Is, at the same time that the gate is connected to the reverse phase input terminal Vin of the differential amplifier circuit 40. The diode diode transistor block 41b is connected, and the second load diode diode transistor block 42b is connected between the drain of the second differentially amplified MOS transistor M1b and the electrostatic source Vdd, and the first load diode is used. The first differentially amplified MOS transistor of the diode transistor block 42a ( The (drain) connection terminal of M1a is the reverse output terminal Von of the differential amplifier circuit 40, and the (drain) terminal of the second differentially amplified MOS transistor M1b of the second load diode diode transistor 42b Is connected to the normal output terminal (Vop) of the differential amplifier circuit (40).

The first and second diode impedance transistors 41a and 41b for source impedance respectively have a finite number (including zero) of diode diodes connected to the gate and the drain to make a diode between the drain and the source. It is configured by. In the example of Fig. 5, the diodeizing transistor blocks 41a and 41b for the first and second source impedances are composed of one diodeized MOS transistor Msa and Msb, respectively.

Each of the first and second load diode diode transistors 42a and 42b is configured by directly / parallel connecting a number of diode transistors that connect a gate and a drain to make a diode between the drain and the source. In the example of Fig. 5, the first and second load diode diode transistor blocks 42a and 42b are each formed by connecting four diodeized MOS transistors ML1a to ML4a and ML1b to ML4b in series.

(D-2) Operation of the fourth embodiment

In Fig. 5, since the input terminals Vip and Vin of the differential amplifier circuit 40 are gates of the first and second differentially amplified MOS transistors M1a and M1b, no current flows through the input terminals Vip and Vin. .

Although the current flows in the diode transistors 41a and 41b for the first and second source impedances according to the differential input voltage supplied between the input terminals Vip and Vin, the diodes for the first and second source impedances are diodeized. Since the connection points of the transistor blocks 41a and 41b are connected to the suction constant current source Is, the potential of this connection point (the suction constant current source Is connection terminal) is changed appropriately so that the diodes for the first and second source impedances The sum of the currents flowing through the transistor transistor blocks 41a and 41b is always operated to be equal to the constant current value Is through which the suction constant current source Is flows.

That is, as the current flowing through the first source impedance diodeizing transistor block 41a increases (decreases), the current flowing through the second source impedance diodeizing transistor block 41b decreases (increases). In these first and second source impedance diode transistors 41a and 41b, a differential current flows in accordance with the differential voltages of the input terminals Vip and Vin.

A current equal to the current of the first source impedance diodeizing transistor block 41a flows through the first load diode diode transistor 42a, and a second source impedance diode is passed through the second load diode diode transistor 42b. A current similar to that of the current transistor block 41b flows to generate a differential output voltage between the normal output terminal Vop and the reverse phase output terminal Von.

The operating bias currents of the first and second differentially amplified MOS transistors M1a and M1b of the differential amplifier circuit 40 are independent of the input DC bias power supply Vidc, and the operating bias currents of these MOS transistors M1a and M1b. The sum of the currents is a constant current value Is through which the suction constant current source Is flows.

The differential voltage gain A in the case where the load resistance on the rear end of the differential amplifier circuit 40 is infinite can be considered similar to the source ground amplifier circuit 30 of the first embodiment. The source impedances of the amplified MOS transistors M1a and M1b are RM1sa and RM1sb, respectively, and the impedances per diode transistor of the diode transistors 41a and 41b for the first and second source impedances are RMsa and RMsb, respectively. And the number of transistor series connections in the first and second source impedance diodeization transistor blocks 41a and 41b is ma and mb, and the diodeization transistors in the first and second load diodeization transistor blocks 42a and 42b are used. If the impedance per unit is set to RMLa and RMLb, and the number of transistor series connections in the first and second load diode diode transistor blocks 42a and 42b is na and nb, it can be represented by equation (13). However, equation (13) has the same configuration as that of the first and second differentially amplified MOS transistors M1a and M1b, such as RM1sa = RM1sb = RM1s, and the first and second such as RMsa = RMsb = Rms and ma = mb = m. When the source impedance diodeizing transistor blocks 41a and 41b have the same configuration, and the first and second load diodeizing transistor blocks 42a and 42b have the same configuration, such as RMLa = RMLb = RML and na = nb = n. Indicates.

A = RML × n / (RM1s + RMs × m). (13)

As in the case of the first embodiment, if the shapes of the MOS transistors constituting the differential amplifier circuit 40 match, RML = RM1 s RMs, so that equation (13) can be modified as in equation (14), n> (1 + m), the voltage amplification operation is performed.

A ≒ n / (1 + m)... (14)

As in the case of the first embodiment, the first and second source impedances RM1sa and RM1sb of the first and second amplified MOS transistors M1a and M1b are the first and second amplified MOS transistors M1a and M1b. The gate width of Ws1 and the gate length of Ls1 are substituted, and a new proportional constant K is substituted.

RM1 s ≒ (K / √I) × √ (Ls1 / Ws1). (15)

When the gate and the drain are connected to form a diode, the value calculated by Equation (15) becomes the diode impedance.

Similarly, the diode impedances RMs of the transistors Msa and Msb in the first and second source impedance diodeization transistor blocks 41a and 41b are expressed by the formula Ws and the gate length Ls. (16), the diode impedances RML of the transistors ML1a to ML4a and ML1b to ML4b in the first and second load diode diode transistor blocks 42a and 42b are the transistors ML1a to ML4a and ML1b to When the gate width of ML4b) is set to WL and the gate length is set to LL, it can be expressed by Expression (17).

RMs ≒ (K / √I) × √ (Ls / Ws). (16)

RML ≒ (K / √I) × √ (LL / WL). (17)

Substituting the results of equations (15) to (17) into equation (13) eliminates the (K / √ (I)) term, yielding equation (18), and the gain A is the threshold voltage of each MOS transistor. It can be seen that the ratio of the gate size and the number of each MOS transistor is not affected by (Vt) or bias current.

A = n × √ (LL / WL) / (√ (Ls1 / Ws1) + m × √ (Ls / Ws)). (18)

In the case of an inverted output amplifier using an operational amplifier (Op Amp), the negative feedback resistor for gain determination lowers the input impedance as the amplifying circuit, but in the differential amplifier circuit 40 of the fourth embodiment, the input impedance is the gate of the MOS transistor. Since it is an input impedance, the input impedance as an amplifier circuit can be maintained at high impedance.

Within the operating range where each MOS transistor can be regarded as a saturation operation, as in the first embodiment, equations (13) to (18) always hold, so that linearity is ensured and waveform distortion is not caused.

Since the gain is not affected by the threshold voltage Vt or bias current of each MOS transistor, but becomes a function of only the gate size and the number of the respective MOS transistors, the differential amplifier circuit 40 is as shown in FIG. Multi-stage differential connection between the power lines, even if the power supply line current and the voltage drop caused by the power line resistance reduce the power supply voltage of the amplification circuit 40 far from the power supply terminal, thereby reducing the power supply current. The same voltage gain of the amplifying circuit 40 can be obtained.

The same voltage gain can be obtained even when the power supply voltage is lowered and the power supply current is reduced in the case where the power supply lines are connected in parallel in multiple stages, so that the source ground amplifier circuits 30 and 30A of the first to third embodiments can be obtained. And 30B) (see equation (9)), however, in the fourth embodiment, the influence of the DC bias caused by the differential amplification operation can be eliminated, and the same voltage gain can be achieved.

As described above, in the sensor substrate used for inspecting the display substrate, as shown in Fig. 6, it is required to connect a plurality of amplifier circuits in parallel between the same power supply lines.

In the differential amplifier circuit 40 of the fourth embodiment, the operating currents of the first and second differentially amplified MOS transistors are determined by the suction constant current source Is, regardless of the voltage of the input DC bias power supply VidC. Even if the threshold voltage Vt of the transistor fluctuates, the operating current I of the first and second amplified MOS transistors M1 and M2 does not fluctuate, so that both high gain and high stability of the operating current are achieved. This becomes easy.

As shown in Fig. 6, in the case where the amplifier circuits are connected in parallel in multiple stages between the power supply lines, in the source ground amplifier circuits 30, 30A, and 30B of the first to third embodiments, when the output amplitude increases, the circuit current Although the ripple of R may increase, the ripple of the current of the electrostatic source Vdd and the direct current source bias power source Vidc (which leads to power supply line noise) may be caused. However, in the differential amplifier circuit 40 of the fourth embodiment, It is canceled by the normal load current and the reverse phase load current, so that the power supply current ripple is small and the generation of power line noise is reduced.

When applied to the sensor substrate described above, since only an AC signal is received from the microcapacitive coupling sensor at either the normal or reverse phase input terminal (Vip or Vin), the high resistance ( For example, a direct current bias is supplied to a normal or reverse phase input terminal through which an AC signal is received via a MOS resistor, and an input terminal on which the AC signal is not received is directly connected to a positive input DC bias power supply (Vidc). (For example, the format shown in Figs. 28 to 31 described later) is applied.

(D-3) Effect of 4th Embodiment

According to the differential amplifier circuit 40 of the fourth embodiment, the following effects (a) to (k) can be brought about. As a result, according to the sensor substrate and the inspection apparatus of the fourth embodiment, the accuracy is higher than that of the prior art. You can run the test.

(a) It is possible to realize a differential amplifier circuit whose gain is not influenced by the threshold voltage Vt or bias current of each MOS transistor, and is determined by the ratio of the gate size and the number of transistors of each MOS transistor.

For example, when the differential amplification circuit of the fourth embodiment is applied to an amplification circuit in a sensor circuit formed on a sensor substrate, which is provided in parallel with a length of just over 25 cm, 7168 pieces, it is differential by the same ICization process. Even when the amplification circuit is generated, there is a possibility that the threshold voltage Vt of the MOS transistor is slightly different depending on the position on the sensor substrate. However, since the gain is not affected by the threshold voltages Vt of each MOS transistor, it is possible to match the gain of the sensing amplifier circuits installed in parallel.

(b) In the case of a reverse phase output amplifier using an operational amplifier, the gain determining negative feedback resistor lowers the input impedance as the amplifier circuit, but in the amplifier circuit of the fourth embodiment, since the input impedance is the gate input impedance of the MOS transistor, The input impedance as a circuit can be maintained at high impedance.

(c) Although diode impedance is used, linearity is ensured in the operating range where each MOS transistor can be regarded as a saturation operation, and waveform distortion is not caused.

(d) By matching the structure of the load and source impedance MOS transistors, the ratio of load impedance to source impedance does not change from low frequency to high frequency, and flat gain characteristics can be obtained from low frequency to high frequency.

(e) Since the loop negative feedback circuit from the output to the input, such as an operational amplifier circuit, is unnecessary, there is no fear of oscillation.

(f) Since the loop negative feedback circuit from the output to the input is unnecessary, the bias voltage at the input portion and the bias voltage at the output portion can be set to free values.

(g) An N-type (or P-type) single-type MOS transistor, which is a circuit that does not use a resistance element, and therefore, when IC is formed, the transistor generation process of any one of P-type (or N-type) The resistance generation step becomes unnecessary, and the manufacturing cost can be reduced and the short delivery time can be achieved.

(h) Since a resistor that requires a larger area than a transistor is not used, when IC is used, it is possible to reduce the size (miniaturization) of the circuit compared to an amplifier circuit using a conventional resistor.

(i) Since the operating current I of the first and second differentially amplified MOS transistors is determined by the suction constant current source Is regardless of the voltage of the input DC bias power supply Vidc, the threshold voltage Vt of the transistor It is not affected by the fluctuations, making it easy to achieve both high gain and high stability of the operating current.

(j) It is canceled by the normal load current and the reverse phase load current, so that the power supply current ripple is small and the generation of power line noise is reduced.

(k) The differential amplifier circuits are connected in parallel in multiple stages between the power supply lines, so that the differential amplification of each stage is performed even if the power supply voltage of the differential amplifier circuit far from the power supply terminal decreases due to the power supply line current and the power supply line resistance. Both circuits can achieve a stable voltage gain.

(E) Fifth Embodiment

Next, a fifth embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. In the fifth embodiment, only the amplification circuit in the sensor circuit 8 is different from the embodiment described above, and therefore, the amplification circuit in the fifth embodiment will be described below. The amplifier circuit of the fifth embodiment is also a differential amplifier circuit.

FIG. 7 is a circuit diagram showing the configuration of the differential amplifier circuit according to the fifth embodiment, in which the same and corresponding parts as in the above-described drawings are denoted with the same and corresponding reference numerals.

The differential amplifier circuit 40A according to the fifth embodiment has the following differences and commonalities with respect to the differential amplifier circuit 40 according to the fourth embodiment.

In Fig. 7, the source ground amplifier circuit 40A according to the fifth embodiment includes the respective drains of the first and second amplified MOS transistors M1a and M1b in the differential amplifier circuit 40 of the fourth embodiment. The connection between the positive output terminal and the negative output terminals (Vop and Von) of the differential amplifier circuit and the first and second load diode diode transistor blocks 42a and 42b are disconnected. The first and second current mirror circuits 43a and 43b of the P channel connecting the common terminal to the electrostatic source Vdd are added to the first amplified MOS transistor M1a at the input of the first current mirror circuit 43a. ), The second load diode diode transistor 42b is connected between the output of the first current mirror circuit 43a and the second sub-power Vee1 to connect the second diode diode transistor block for the second load. In order to make the output connection terminal of the first current mirror circuit 43a of 42b the constant output terminal Vop of the differential amplifier circuit 40A, the second current mirror circuit ( The drain of the second amplified MOS transistor M1b is connected to the input of 43b), and the first load diode diode transistor 42a is disposed between the output of the second current mirror circuit 43b and the second sub-power Vee1. Is connected so that the output connection terminal of the second current mirror circuit 43b of the first load diode diode transistor 42a is the negative output terminal Von of the differential amplifier circuit 40A.

As apparent from the above, the relationship between the differential amplifier circuit 40A according to the fifth embodiment and the differential amplifier circuit 40 according to the fourth embodiment is similar to the source ground amplifier circuit 30A according to the second embodiment. Since the operation is the same as that of the source ground amplifier circuit 30 of the first embodiment, the operation of the source ground amplifier circuit 30A according to the second embodiment and the differential amplifier circuit 40 of the fourth embodiment can be understood. The description of the operation is omitted.

However, the gain of the differential amplifier circuit 40A according to the fifth embodiment is simply supplemented. In the differential amplifier circuit 40A according to the fifth embodiment, current amplification is possible by the first and second current mirror circuits 43a and 43b. When the current magnification is k, the RML becomes 1 / √k. The gain A becomes √k times by the current magnification k, and equation (19) is established instead of equation (18) described above. However, as in the case of equation (18), gain A is obtained for each MOS transistor. It is not affected by the threshold voltage (Vt) and the bias current, but depends on the ratio of the gate size and the number of each MOS transistor.

A = √k × n × √ (LL / WL) / (√ (Ls1 / Ws1) + m × √ (Ls / Ws)). (19)

Also in the fifth embodiment, the same effects as in the fourth embodiment can be obtained.

(F) Sixth Embodiment

Next, a sixth embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. Since the sixth embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, the amplification circuit in the sixth embodiment will be described below.

FIG. 8 is a circuit diagram showing the configuration of the amplifier circuit according to the sixth embodiment, in which the same and corresponding parts as in the above-described drawings are denoted with the same and corresponding reference numerals.

In Fig. 8, the amplifier circuit of the sixth embodiment adds a source follower circuit 44 to the differential amplifier circuit 40B. The source follower circuit 44 may be added to the differential amplifier circuit 40 of the fourth embodiment or the differential amplifier circuit 40A of the fifth embodiment.

The differential amplifier circuit 40B of the sixth embodiment has the following differences and commonalities with respect to the differential amplifier circuit 40 of the fourth embodiment.

The differential amplifier circuit 40B of the sixth embodiment includes the drains of the first and second amplified MOS transistors M1a and M1b and the reverse phase output terminals Von and the normal in the differential amplifier circuit 40 of the fourth embodiment. The output terminal Vo is disconnected, the reverse phase output terminal Von is connected to the drain of the first cascode MOS transistor M2a, and the gate of the first cascode MOS transistor M2a is connected to the cascode gate bias. The power supply Vb is connected, the source of the first cascode MOS transistor M2a is connected to the drain of the first amplified MOS transistor M1a, and the normal output terminal Vop is connected to the second cascode MOS transistor M2b. The drain of the second cascode MOS transistor M2b, the gate of the second cascode MOS transistor M2b, and the source of the second cascode MOS transistor M2b to the second amplified MOS transistor M1b. Is connected to the drain of the first and second amplified MOS transistors M1a and M1b The high frequency compensation capacitor Cp is connected between the high frequency output capacitors and the high frequency cut capacitor CL is connected between the reverse phase output terminal Von and the normal output terminal Vop.

In addition, when the high frequency compensation is unnecessary, the high frequency compensation capacitance Cp may be omitted, or when the high frequency cut is unnecessary, the high frequency cut capacitance CL may be omitted. The high frequency compensation capacitor Cp and the high frequency cut capacitor CL may be added to the differential amplifier circuit 40 of the fourth embodiment or the differential amplifier circuit 40A of the fifth embodiment described above.

The high-pass compensation capacitor Cp may be connected between the terminals of any one of the diodeizing transistors in the first and second source impedance diodeizing transistor blocks 41a and 41b instead of the positions of the connection points described above. The high-frequency cut capacitance CL may also be connected between the terminals of any one of the diode transistors in the first and second load diode transistor blocks 42a and 42b. The high pass compensation characteristic and the high pass cut characteristic change according to the connection position and the capacitance value of the capacitance.

The functions of the high frequency compensation capacitor Cp and the high frequency cut capacitor CL are the same as those of the fourth embodiment described above.

Also in the differential amplifier circuit, a source follower circuit and a rectifier circuit can be added to the constant output (Vop) terminal and the negative output (Von) terminal. FIG. 8 shows an example in which the source follower circuit 44 is connected. .

The normal input terminal Vip1 of the source follower circuit 44 is connected to the normal output terminal Vop of the differential amplifier circuit 40B, and the source follower circuit (Von) is connected to the reverse phase output terminal Von of the differential amplifier circuit 40B. The reverse phase input terminal Vin1 of 44 is connected.

The source follower circuit 44 has two source follower circuits, one for normal use and one for reverse use.

The source follower circuit 44 removes the drains of the source follower MOS transistors M3b and M3a for connecting a gate to one of the normal input terminal Vip1 and the reverse phase input terminal Vin1 of the source follower circuit 44. 2 is connected to the electrostatic source Vdd1, and the source follow load constant current sources Ida and Idb are connected between the sources of the source follow MOS transistors M3b and M3a and the ground, and the source of the source follow MOS transistor M3b is sourced. The normal output Vop1 of the follower circuit 44 is used, and the source of the source follower MOS transistor M3a is configured to be the reverse phase output Von1 of the source follower circuit 44. In addition, similarly to the third embodiment, the voltage holding capacitors may be connected in parallel to the source follow load constant current sources Ida and Idb, respectively.

Like the source follower / rectifier circuit 34 of the third embodiment, the source follower circuit 44 of the sixth embodiment operates as a voltage buffer circuit having a high input impedance and a low output impedance, and also changes the DC potential ( level shift circuit function.

According to the sixth embodiment, with respect to the differential amplification operation surface, the same effects as in the fourth embodiment can be obtained, and the functions of the high pass compensation capacitor Cp and the high pass cut capacitance CL and the source follower circuit 44 As for the functional surface, the same effects as in the third embodiment can be obtained.

(G) Seventh Embodiment

Next, a seventh embodiment of a sensor substrate and an inspection apparatus according to the present invention will be described with reference to the drawings. The seventh embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, so that the amplification circuit in the seventh embodiment will be described below.

(G-1) Structure of Seventh Embodiment

FIG. 9 is a circuit diagram showing the configuration of the amplifier circuit according to the seventh embodiment, in which the same and corresponding parts as in the above-described drawings are denoted with the same and corresponding reference numerals.

In FIG. 9, the amplifier circuit 50 of 7th Embodiment adds the source follower circuit 44 to the differential amplifier circuit 51 which has the differential amplifier 52 and the suction constant current source 53. As shown in FIG.

In the following, the description of the source follower circuit 44 will be omitted, and the differential amplifier circuit 51 will be described.

 The differential amplifier circuit 51 includes a differential amplifier 52, a suction constant current source 53, and a power supply level shift diode transistor (MLs). The differential amplifier 52 corresponds to a portion excluding the suction constant current source 53 in the differential amplifier circuit configuration. The suction constant current source 53 and the power supply level shift diode transistors MLs of the seventh embodiment include the threshold voltages of the transistors in the amplifier circuit 50 including the MOS transistors M3a and M3b in the source follower circuit 44. Output DC bias voltage compensation for variations in (Vt).

The differential amplifier 52 is provided between the source and the suction constant current source terminal Is of the first differentially amplified MOS transistor M1a whose gate is the normal input terminal Vip of the differential amplifier circuit 51. The feedback source resistor Rsa is connected, the first load resistor RLA is connected between the drain of the first differential amplifying MOS transistor M1a and the electrostatic terminal Vd, and the gate is connected to the differential amplifier circuit 50. The second negative feedback source resistor Rsb is connected between the source of the second differentially amplified MOS transistor M1b and the suction constant current source terminal Is, and the second differentially amplified MOS The second load resistor RLb is connected between the drain of the transistor M1b and the electrostatic terminal Vd to connect the (drain) connection terminal of the first differential amplified MOS transistor M1a of the first load resistor RLa. The reverse phase output terminal Von of the differential amplifier circuit 50 is used as the drain of the second differentially amplified MOS transistor M1b of the second load resistor RLb. And the speed stage to a normal output terminal (Vop) of the differential amplifier circuit 51.

Further, a power supply level shift diode-ized MOS transistor MLs connected with a gate and a drain is connected between the electrostatic source Vdd and the electrostatic source terminal Vd of the differential amplifier 52 so as to be forward biased.

The suction constant current source 53 has a constant current set resistance Rss between a source of the constant current source output MOS transistor Mis and a negative power supply Vee that connect a drain to the suction constant current source terminal Is of the differential amplifier 52. ), The gate of the constant current source output MOS transistor Mis and the source of the electrostatic current source level shift MOS transistor Mis are connected to the constant current source level shift transistor bias constant current source Iss, and the constant current source level shift MOS transistor ( The constant current source circuit gate bias power supply Vb1 is connected to the gate of Miss, and the third electrostatic source Vdd2 is connected to the drain of the constant current source level shift MOS transistor Miss.

(G-2) Operation of the Seventh Embodiment

Since the differential amplification operation and the source follower circuit operation in the amplifier circuit of the seventh embodiment can be understood from the above description, the description is omitted.

Forward bias voltage of the power supply level shift diode MOS transistor MLs connected between the electrostatic source Vdd and the electrostatic source terminal Vd of the differential amplifier 52 and the suction constant current source terminal of the differential amplifier 52. The drain and the electrostatic terminal of each of the first and second differentially amplified MOS transistors M1a and M1b are set so that the voltage between the gate and the source of the constant current source output MOS transistor Mis connecting the drain to Is is equal. A constant current between the terminal-to-terminal voltage and the source of the constant current source output MOS transistor Mis and the negative power supply Vee when no signal of the first and second load resistors RLa and RLb is connected between Vd; Set the voltage between terminals of the set resistance (Rss) to be the same.

Specifically, since the same current flows through the power supply level shift diode MOS transistor MLs and the constant current source output MOS transistor Mis, the MOS transistors having the same gate width, the same gate length, and the same threshold voltage Vt are used. Since half of the current flowing through the constant current setting resistor Rss flows through the first and second load resistors RLa and RLb, RLa = RLb = 2 x Rss.

By the above setting, the potential difference between the constant output and the negative output terminals Vop and Von of the electrostatic source Vdd and the differential amplifier 52, the source potential Vb1o and the negative current of the constant current source level shift MOS transistor Miss The potential difference between the circles Vee is always the same, as shown in equation (20), regardless of the variation in the threshold voltage Vt of the transistor. Hereinafter, the relationship of equation (20) will be referred to as 'condition 1'.

Vdd-Vop = Vdd-Von = Vb1o-Vee... (20) (Condition 1)

Furthermore, the gate lengths of the constant current source level shift MOS transistors Miss and the first and second source follow MOS transistors M3a and M3b are set equal, and the first and second source follow MOS transistors M3a and M3b are equal. And the gate width ratio of the constant current source level shift MOS transistor (Miss), the output currents Ida and Idb of the first and second source follow load constant current sources Ida and Idb, and the constant current source level shift transistor bias constant current source Iss If the current ratio of the output current Is is equal to, the voltage between the gate and the source of the first and second source follow MOS transistors M3a and M3b and the constant current source level shift as shown in equation (21). The voltage between the gate and the source of the MOS transistor Miss is equal.

Vip1-Vop1 = Vin1-Von1 = Vb1-Vb1o... (21)

Since Vip1 = Vop, Vin1 = Von, equation (21) can be rewritten as equation (22). Hereinafter, the relationship of equation (22) will be referred to as 'condition 2'.

Vop-Vop1 = Von-Von1 = Vb1-Vb1o... (22) (condition 2)

Equation (23) can be obtained by adding each side of Expression (20) and Expression (22) described above, and if Vo1 = Vop1 = Von1, Expression (23) can be transformed as in Expression (24). have.

Vdd-Vop1 = Vdd-Von1 = Vb1-Vee... (23)

Vo1 = Vdd-Vb1 + Vee. (24)

That is, regardless of the variation in the threshold voltage Vt of the transistor, the potential difference between the constant output and the negative output terminals Vop1 and Von1 of the electrostatic source Vdd and the source follower circuit 44 is always constant. It can be equal to the potential difference between the power source Vb1 and the negative power source Vee.

The bias voltage compensation (condition 1) between the differential amplifier 52 and the suction constant current source 53 and the compensation (condition 2) for the level shift voltages of the two source follower circuits in the source follower circuit 44 are respectively. Since it can be independent, the MOS transistor of the differential amplifier 52, the suction constant current source 53, and the source follower circuit 44 can be made into the optimal size (performance).

As schematically shown in Fig. 6, when the amplifying circuit of the seventh embodiment is connected between the power supply lines in parallel in parallel, the electrostatic source current of the electrostatic source Vdd and the negative power supply current of the sub power source Vee , In a proportional relationship, no power supply current flows through the constant current source circuit gate bias power supply Vb1. Therefore, the voltage of the power supply line of the constant current source circuit gate bias power supply Vb1 is the same everywhere.

On the other hand, since each power supply current flows through the electrostatic source Vdd line and the negative power supply line, the voltage of the power supply line current and the power supply line resistance drop as the voltage of the electrostatic power supply line moves away from the feed portion. As the potential decreases and the voltage of the negative power supply line moves away from the power supply portion, the potential rises due to the voltage drop of the power supply line current and the power supply line resistance. The ratio of the resistance of the unit length of the electrostatic source line and the resistance of the unit length of the sub-power line and the current ratio flowing through these electrostatic sources and the sub-power line are set to be inverse ratios. This lowered voltage ΔVdd is equal to the voltage ΔVee at which the voltage of the negative power supply line rises. Applying this relationship [Delta] Vdd = [Delta] Vee to equation (24) described above, the equation (25) can be obtained, and the output bias Vo1 of the differential amplifier circuit becomes constant, irrespective of the distance from the power feeding portion, i.e. It can be seen that the output bias Vo1 of the differential amplifier circuit becomes constant regardless of the variation in the threshold voltage Vt of the transistor and the distance from the power supply portion.

Vo1 = Vdd−ΔVdd−Vb1 + Vee + ΔVee = Vdd-Vb1 + Vee... (25)

(G-3) Effects of the Seventh Embodiment

According to the amplifying circuit 50 of the seventh embodiment, the following effects (a) to (c) can be brought about. As a result, according to the sensor substrate and the inspection apparatus of the seventh embodiment, it is much more accurate than before. You can run the test.

(a) Even if the threshold voltage Vt of the MOS transistor fluctuates, a differential amplifier circuit can be obtained in which the rectified output DC bias voltage is always constant at no input.

(b) When the differential amplifier circuit is connected in parallel in multiple stages between the power lines, the power supply voltage of the amplification circuit far from the power supply terminal decreases due to the voltage drop caused by the power supply line current and the power supply line resistance. In contrast, it is possible to obtain a differential amplifier circuit in which the output DC bias voltage does not fluctuate when there is no input.

(c) Bias voltage compensation (condition 1 above) between the differential amplifier 52 and the suction constant current source 53 for the variation of the threshold voltage Vt of the MOS transistor, and the two in the source follower circuit 44. Since the compensation for the level shift voltage of the source follower circuit (condition 2 above) can be independently performed, the MOS transistors of the differential amplifier 52, the suction constant current source 53, and the source follower circuit 44 are optimally sized. Can be made (performance).

(H) 8th Embodiment

Next, an eighth embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. The eighth embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, so that the amplification circuit in the eighth embodiment will be described below.

Fig. 10 is a circuit diagram showing the configuration of the amplifier circuit according to the eighth embodiment, in which the same and corresponding parts as those in the above-described drawings are denoted with the same and corresponding reference numerals.

The amplifier circuit 50A according to the eighth embodiment has the following differences and commonalities as compared with the amplifier circuit of the seventh embodiment.

In the amplifying circuit 50A according to the eighth embodiment, the first negative feedback source resistor Rsa of the differential amplifier 52 in the amplifying circuit 50 of the seventh embodiment is removed and the first differential amplification is performed. While the source of the MOS transistor M1a is the first suction constant current source terminal Isa, the second negative feedback source resistor Rsb of the differential amplifier 52 is removed, and the second differentially amplified MOS transistor ( The source of M1b is the second suction constant current source terminal Isb, the source resistor Rs is connected between the sources of the first and second differentially amplified MOS transistors M1a and M1b, and the differential amplifier 52A is provided. Consists of.

Further, in the amplifier circuit 50A according to the eighth embodiment, the first suction constant current is removed by removing the constant current source output MOS transistor Mis and the constant current set resistor Rss in the amplifier circuit 50 of the seventh embodiment. While connecting the first constant current setting resistor Rssa between the source of the first constant current source output MOS transistor (Misa) and the negative power supply (Vee) for connecting the drain to the original terminal (Isa), the second suction constant current source terminal A second constant current setting resistor Rssb is connected between the source of the second constant current source output MOS transistor Misb and the negative power supply Vee connecting a drain to the isb, and the first and second constant current source output MOS transistors are connected. Each gate of (Misa and Misb) and the source of the constant current source level shift MOS transistor (Miss) are connected to the constant current source level shift transistor bias constant current source (Iss) to form a suction constant current source (53A).

In the amplifying circuit 50A according to the eighth embodiment, between the forward bias voltage of the power supply level shift diode-ized MOS transistors MLs and the gates and sources of the first and second constant current source output MOS transistors Misa and Misb, respectively. Are set to be equal to each other, and the voltage between the terminals of the first and second load resistors RLa and RLb at the time of no signal is equal to the voltage between the terminals of the first and second constant current setting resistors Rssa and Rssb. Do it.

Specifically, since half of the current flowing through the power supply level shift diode MOS transistor MLs flows into the first and second constant current source output MOS transistors Misa and Misb, the power supply level shift diodeization MOS transistor ( The gate width of MLs) is set to twice the gate width of the first and second constant current source output MOS transistors (Misa and Misb), so that the MOS transistors of the same gate length and the same threshold voltage (Vt) are used. The same current flows through the two load resistors RLa and RLb and the first and second constant current setting resistors Rssa and Rssb so that RLa = RLb = Rssa = Rssb.

By the above setting, the potential difference between the static power supply Vdd and the positive and negative output terminals Vop and Von of the differential amplifier, the source potential Vb1o and the negative power supply Vee of the constant current source level shift MOS transistor Miss; The interpotential difference is always the same regardless of the variation of the threshold voltage Vt of the transistor, and condition 1 described above is satisfied.

Similarly to the amplifying circuit 50 according to the seventh embodiment, the amplification circuit 50A according to the eighth embodiment holds condition 2.

When condition 1 and condition 2 described above are simultaneously established, similarly to the amplifying circuit 50 according to the seventh embodiment, the constant output and negative output terminals Vop1 of the electrostatic source Vdd and the first and second source follower circuits are provided. The potential difference between Von1 and Von1 can always be equal to the potential difference between the constant current source circuit gate bias power supply Vb1 and the negative power supply Vee regardless of the variation in the threshold voltage Vt of the transistor.

Also in the eighth embodiment, the same effects as in the seventh embodiment described above can be obtained.

(I) Ninth Embodiment

Next, a ninth embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. Since only the amplifier circuit in the sensor circuit 8 differs from the above-described embodiment in the ninth embodiment, the amplification circuit in the ninth embodiment will be described below.

FIG. 11 is a circuit diagram showing the configuration of the amplifier circuit according to the ninth embodiment, in which the same and corresponding parts as those described above are denoted by the same and corresponding reference numerals.

The amplifier circuit 50B according to the ninth embodiment has the following differences and commonalities as compared with the amplifier circuit 50 of the seventh embodiment.

In the amplifier circuit 50B according to the ninth embodiment, the constant current source output MOS transistor Mis, the constant current set resistor Rss, and the constant current source level shift transistor bias constant current source (in the amplification circuit 50 of the seventh embodiment). Iss) and the first and second source follow load constant current sources Ida and Idb of the source follow circuit 44 are removed.

In the amplifier circuit 50B according to the ninth embodiment, one end of the second reference constant current setting resistor Rsss is connected to the source of the constant current source level shift MOS transistor Miss, and the second reference constant current setting resistor Rsss is connected. (1) A constant current setting diode-ized MOS transistor (1) which connects a gate and a drain which is an input terminal of the current mirror circuit, and a source which is a common terminal of the current mirror circuit, to a negative power supply (Vee). Mis1) and (2) the drain is connected to the suction constant current source terminal Is of the differential amplifier 53, the gate is connected to the input terminal of this current mirror circuit, and the source is connected to the common terminal of this current mirror circuit. (3) A drain is connected to the source of the first current mirror current output MOS transistor Mm1 to be connected, and (3) a source of the first source follow MOS transistor M3a, and a gate is connected to an input terminal of the current mirror circuit. Common stage of this current mirror circuit (4) a drain is connected to the source of the second current mirror current output MOS transistor Mm2 and (4) the source of the second source follow MOS transistor M3b, and the gate is connected to an input terminal of the current mirror circuit. The third current mirror current output MOS transistor Mm3 is connected to the common terminal of the current mirror circuit.

In the amplifying circuit 50B according to the ninth embodiment, the forward bias voltage of the power supply level shift diode MOS transistor MLs and the forward bias voltage of the constant current setting diode MOS transistor Mis1 of the current mirror circuit are set equal to each other. The voltage between the terminals when no signals of the first and second load resistors RLa and RLb are equal to the voltage between the terminals of the second reference constant current setting resistor Rsss is set to be the same.

Alternatively, the voltage between the gate and the source of the first and second source follow MOS transistors M3a and M3b and the forward bias voltage of the constant current setting diode-generated MOS transistor Mis1 of the current mirror circuit are set equal to each other, and the power supply level shifts. The forward bias voltage of the diode-ized MOS transistor MLs is set equal to the voltage between the gate and the source of the constant current source level shift MOS transistor Miss, and the first and second load resistors RLa and RLb have no signal. The voltage between the terminals and the voltage between the terminals of the second reference constant current setting resistor Rsss are set to be the same.

Specifically, the gate length of the transistor and the threshold voltage Vt are made the same, the gate width is increased in proportion to the flowing current value, and the resistance value is set as the inverse ratio of the flowing current ratio.

As described above, similarly to the amplifying circuit 50 according to the seventh embodiment, the potential difference between the positive output and the negative output terminals Vop1 and Von1 of the electrostatic source Vdd and the source follower circuit 44B is determined as the threshold value of the transistor. Regardless of the variation in the voltage Vt, it can always be equal to the potential difference between the constant current source circuit gate bias power supply Vb1 and the negative power supply Vee.

(J) Tenth Embodiment

Next, a tenth embodiment of a sensor substrate and an inspection apparatus according to the present invention will be described with reference to the drawings. In the tenth embodiment, only the amplification circuit in the sensor circuit 8 is different from the embodiment described above, and therefore, the amplification circuit in the tenth embodiment will be described below. The amplifier circuit of the tenth embodiment is a differential amplifier circuit to which a full wave rectifier circuit is added.

(J-1) Structure of Tenth Embodiment

Fig. 12 is a circuit diagram showing the configuration of the amplifier circuit according to the tenth embodiment, in which the same and corresponding parts as in the above-described drawings are denoted with the same and corresponding reference numerals.

The amplifying circuit 60 according to the tenth embodiment is a differential to which a full-wave rectifying circuit is added, in which the source follower circuit 44 in the amplifying circuit 50 of the seventh embodiment is replaced with the full-wave rectifying circuit 61. It is an amplification circuit. That is, the full-wave rectifier circuit 44, which is connected to the positive and negative outputs Vop and Von of the differential amplifier 52, is input from the first and second input terminals Vin1 and Vip1. 61).

The full-wave rectifying circuit 61 removes the second source follow load constant current source Idb of the source follow circuit 44, connects the sources of the first and second source follow MOS transistors M3a and M3b, and propagates them. The rectified output terminal Vo1 is used, and a voltage holding capacitor Ch is additionally connected between the full-wave rectified output terminal Vo1 and the ground.

(J-2) Operation of the Tenth Embodiment

In the amplifying circuit 60 according to the tenth embodiment, the differential amplification circuit operation or the compensation operation of the DC bias potential (when no input of the full-wave rectifying output Vo1) is applied to the variation of the threshold voltage Vt of the MOS transistor. The description is the same as that of the amplifier circuit 50 of the seventh embodiment described above, and thus detailed description thereof is omitted.

The full-wave rectifying circuit 61 according to the tenth embodiment includes a source follower / rectifier circuit (see FIG. 4 described above) corresponding to the first input terminal Vin1 and a source corresponding to the second input terminal Vip1. It is a fusion of follow and rectifier circuits. That is, the outputs of the two source follower / rectifier circuits are combined, the two source follower load constant current sources Ida and Idb are combined into one, and Ida is set again. Similarly, the two voltage holding capacitors Cha and Chb are set to one. The voltage holding capacity (Ch) is added again, and the high potentials of the two input voltages (Vi1p and Vi1n) become valid, and the low potential side is ignored, and the two input voltages (Vi1p and Vi1n) are differential signals. Therefore, full-wave rectification is performed.

As in the seventh embodiment, the bias voltage compensation (condition 1 above) between the differential amplifier 52 and the suction constant current source 53 with respect to the variation in the threshold voltage Vt of the MOS transistor, and the full-wave rectification circuit 61 Since the compensation for the level shift voltage of the source follow MOS transistor (Condition 2) can be independently performed, the MOS transistor of the differential amplifier 52, the suction constant current source 53, and the full-wave rectifier circuit 61 is It can be made to the optimum size (performance).

As schematically shown in Fig. 13, when the amplification circuit 60 of the tenth embodiment is connected in parallel between power supply lines, the power supply terminal is caused by the voltage drop caused by the power supply line current and the power supply line resistance. Differential amplification, in which the power supply voltage of the amplification circuit 60 far from is lowered, but similar to that described in the seventh embodiment, the current bias potential at the no signal of the full-wave rectifying output Vo1 is compensated and does not vary with respect to the power supply voltage drop. Operation, full-wave rectification operation.

(J-3) Effects of the Tenth Embodiment

According to the amplifying circuit 60 of the tenth embodiment, the following effects (a) to (c) can be obtained. As a result, according to the sensor substrate and the inspection apparatus of the seventh embodiment, it is much more accurate than before. You can run the test.

(a) Even if the threshold voltage Vt of the MOS transistor of the differential amplifier circuit 51 fluctuates, the full-wave rectification operation can be added to the differential amplification operation in which the rectified output DC bias voltage is always constant at no input.

(b) In the case where the amplification circuit 60 of the tenth embodiment is connected in parallel between power supply lines, the power supply voltage of the amplification circuit far from the power supply terminal is reduced due to the voltage drop caused by the power supply line current and the power supply line resistance. Although it decreases, the full-wave rectification operation can be added to the differential amplification operation in which the output DC bias voltage does not change when the power supply voltage decreases.

(c) Bias voltage compensation (condition 1 above) between the differential amplifier 52 and the suction constant current source 53 with respect to the variation of the threshold voltage Vt of the MOS transistor, and the source of the full-wave rectifying circuit 61. Since the compensation for the level shift voltage (following condition 2) of the follow MOS transistor can be independently performed, the MOS transistors of the differential amplifier 52, the suction constant current source 53, and the full-wave rectifier circuit 61 are optimally sized ( Performance).

(J-4) Modified embodiment of the tenth embodiment

The amplifying circuit 60 of the tenth embodiment replaces the source follower circuit 44 in the amplifying circuit 50 of the seventh embodiment with the full-wave rectifying circuit 61, but the eighth and ninth embodiments The source follower circuits 44 and 44B in the amplification circuits 50A and 50B of the form may be replaced with a full-wave rectifier circuit.

Although the detailed description is omitted, FIG. 14 shows that the source follower circuit 44 in the amplifier circuit 50A of the eighth embodiment is replaced with the full-wave rectifying circuit 61, and FIG. 15 shows the ninth embodiment. The source follower circuit 44B in the amplifier circuit 50B is replaced with the full-wave rectifier circuit 61B.

(K) Eleventh Embodiment

Next, an eleventh embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. The eleventh embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, so that the amplification circuit in the eleventh embodiment will be described below. The amplifier circuit of the eleventh embodiment is a differential amplifier circuit to which a peak hold circuit is added. The added peak hold circuit is with a reset.

(K-1) Structure of Eleventh Embodiment

Fig. 16 is a circuit diagram showing the configuration of the amplifier circuit according to the eleventh embodiment, in which the same and corresponding parts as in the above-described drawings are denoted with the same and corresponding reference numerals.

The amplification circuit 60C according to the eleventh embodiment performs differential amplification with a peak hold circuit in which the source follower circuit 44 in the amplification circuit 50 of the seventh embodiment is replaced with a peak hold circuit 62. Circuit. That is, the peak hold circuit 44, which is connected to the positive and negative outputs Vop and Von of the differential amplifier 52, is input from the first and second input terminals Vin1 and Vip1. 62).

The amplifier circuit 60C according to the eleventh embodiment removes the first and second source follow load constant current sources Ida and Idb of the source follow circuit 44 in the amplifier circuit 50 of the seventh embodiment. Between the sources of the first and second source follow MOS transistors M3a and M3b to be the peak hold output terminal Vo1, and between the peak hold output terminal Vo1 and the ground, the voltage holding capacitor Ch And the terminal of the voltage holding capacitor Ch connected to the peak hold output terminal Vo1 intermittently by the pulse signal from the switch drive pulse signal source VpL. The series circuit of the switch circuit Sw connected to Vb3) and the resistor Ro which limits the current of this switch circuit Sw is additionally connected.

That is, in the amplifier circuit 60C according to the eleventh embodiment, the constant current Ida sent by the source follow load constant current source Ida (see FIG. 12) is set to 0 (clear), and instead, the switch drive pulse. The switch circuit Sw for intermittently connecting the terminal of the voltage holding capacitor Ch connected to the peak hold output terminal Vo1 to the peak hold reset bias power supply Vb3 by a pulse signal from the signal source VpL. Is installing.

The peak hold circuit 62 with the reset shown in FIG. 16 is schematically shown, and the specific circuit is not limited to the configuration shown in FIG.

In the amplifying circuit 60C according to the eleventh embodiment, the voltage between the gate and the source of the first and second source follow MOS transistors M3a and M3b almost starts rectifying operation at the threshold voltage Vt of the MOS transistor. Therefore, the voltage between the gate and the source of the constant current source level shift MOS transistor Miss must also be almost the threshold voltage Vt of the MOS transistor, and the output current of the constant current source level shift transistor bias constant current source Iss Iss) is made as small as possible, and the gate width of the constant current source level shift MOS transistor Miss is made as large as possible.

(K-2) Operation of the Eleventh Embodiment

In the amplifying circuit 60C according to the eleventh embodiment, the differential amplifying circuit operation or the compensation operation of the DC bias potential (when no input of the peak hold output Vo1) is applied to the variation of the threshold voltage Vt of the MOS transistor. The description is the same as that of the amplifier circuit 50 of the seventh embodiment described above, and thus detailed description thereof is omitted.

In the eleventh embodiment, since the source follower circuit 44 in the amplifier circuit 50 of the seventh embodiment is replaced with the peak hold circuit 62, the reset of the output of the differential amplifier 52 is performed. This attached peak hold operation is executed. When the switch circuit Sw is off, the peaks of the outputs Vop and Von of the differential amplifier 52 are held (detected peaks), and when the switch circuit Sw is on, The peak detection output is reset to the output voltage value of the peak hold reset bias power supply Vb3. In addition, the resistor Ro is for limiting the reset current flowing through the switch circuit Sw to an appropriate value when the switch circuit Sw is turned on.

Similar to the seventh embodiment, the bias voltage compensation (condition 1 above) between the differential amplifier 52 and the suction constant current source 53 with respect to the variation of the threshold voltage Vt of the MOS transistor and the peak hold circuit 62 Since the compensation for the level shift voltage of the source follow MOS transistor (Condition 2) can be independently performed, the MOS transistor of the differential amplifier 52, the suction constant current source 53, and the peak hold circuit 62 is It can be made to the optimum size (performance).

As schematically shown in FIG. 13 described above, when the amplification circuit 60C of the eleventh embodiment is connected in parallel in multiple stages between the power supply lines, a voltage drop caused by the power supply line current and the power supply line resistance is applied. Although the power supply voltage of the amplifying circuit 60 far from the power supply terminal decreases, as in the third embodiment, the DC bias potential at the time of no input of the peak hold output Vo1 is compensated and does not change with respect to the power supply voltage drop. Differential amplification operation, peak hold operation.

(K-3) Effects of the Eleventh Embodiment

According to the amplifying circuit 60C of the eleventh embodiment, the following effects (a) to (c) can be brought about. As a result, according to the sensor substrate and the inspection apparatus of the eleventh embodiment, a higher precision is achieved than in the prior art. You can run the test.

(a) Even if the threshold voltage Vt of the MOS transistor of the differential amplifier circuit 51 fluctuates, the peak hold operation can be added to the differential amplification operation in which the DC bias voltage of the peak hold output at the time of no input is always constant.

(b) In the case where the amplification circuit 60C of the eleventh embodiment is connected in parallel between the power supply lines, the power supply voltage of the amplification circuit far from the power supply terminal is reduced due to the voltage drop caused by the power supply line current and the power supply line resistance. Although it decreases, the peak hold operation can be added to the differential amplification operation in which the output DC bias voltage does not change when no power supply voltage is reduced.

(c) Follow the bias voltage compensation (condition 1 above) between the differential amplifier 52 and the suction constant current source 53 for the variation of the threshold voltage Vt of the MOS transistor and the source of the peak hold circuit 62. Since the compensation for the level shift voltage of the MOS transistor (condition 2 above) can be independently performed, the MOS transistors of the differential amplifier 52, the suction constant current source 53, and the peak hold circuit 62 are optimally sized (performance). You can make

(K-4) Modified Embodiments of the Eleventh Embodiment

The amplifying circuit 60C of the eleventh embodiment replaces the source follow circuit 44 in the amplifying circuit 50 of the seventh embodiment with the peak hold circuit 62. The source follower circuits 44 and 44B in the amplifier circuits 50A and 50B of the embodiment and the ninth embodiment may be replaced by the peak hold circuit 62.

(L) 12th Embodiment

Next, a twelfth embodiment of the sensor substrate and the inspection apparatus according to the present invention will be described with reference to the drawings. The twelfth embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, so that the amplification circuit in the twelfth embodiment will be described below. The amplifier circuit according to the twelfth embodiment replaces the resistance of the amplifier circuit according to the seventh embodiment with a diode transistor block.

(L-1) Structure of Twelfth Embodiment

Fig. 17 is a circuit diagram showing the construction of the amplifying circuit according to the twelfth embodiment, in which the same and corresponding parts as those in the previously described drawings are denoted with the same and corresponding reference numerals.

In Fig. 17, the amplifier circuit 70 of the twelfth embodiment adds a source follower circuit 44 to a differential amplifier circuit 71 having a differential amplifier 72 and a suction constant current source 73.

Hereinafter, the description of the source follower circuit 44 will be omitted, and the differential amplifier circuit 71 will be described.

The differential amplifier circuit 71, like the differential amplifier circuit 51 of the seventh embodiment shown in FIG. 9, has a differential amplifier 72, a suction constant current source 73, and a power supply level shift diode transistor ( MLs).

The differential amplifier 72 connects the gate and the drain to the first and second negative feedback source resistors Rsa and Rsb in the differential amplifier 52 of the seventh embodiment to connect a diode between the drain and the source. The first and second source impedance diode diode transistors 41a and 41b constituted by direct / parallel connection of finite diodes (including zero) by a finite number (including zero), and the differential amplification of the seventh embodiment The first and second load resistors RLa and RLb in the unit 52 are configured by directly / parallel numbering diode-forming transistors connecting the gate and the drain to form a diode between the drain and the source. It has the same structure as that substituted by the 2nd load diode transistor block 42a and 42b.

In addition, the suction constant current source 73 defines a diode current transistor which makes the constant current set resistance Rss in the suction constant current source 53 of the seventh embodiment a diode between the drain and the source by connecting the gate and the drain. It has the same structure as the one substituted by the suction constant current setting diode-ization transistor block 74 comprised by the parallel connection of several pieces.

(L-2) Operation of the Twelfth Embodiment

Hereinafter, the characteristic operation of the amplifying circuit 70 according to the twelfth embodiment will be briefly mentioned.

The voltage gain is determined by the gate size of the MOS transistor and the number of each diode transistor, similarly to the fourth to sixth embodiments described above, and does not vary with the variation of the threshold voltage Vt of the MOS transistor. In addition, similarly to the seventh (ninth) embodiments, by matching the voltage drop between the corresponding elements, even when the threshold voltage Vt of the MOS transistor is changed, similarly to the seventh (ninth) embodiment, A differential amplifier circuit can be obtained in which the rectified output DC bias voltage is always constant at no input.

In the above operation, similarly to the fourth (sixth) and seventh (ninth) embodiments, the amplification circuit 70 according to the twelfth embodiment is connected in parallel in multiple stages between power supply lines (Fig. (6), the voltage drop caused by the power line current and the power line resistance lowers the power supply voltage of the amplification circuit far from the power supply terminal.However, the output DC bias voltage fluctuates when the voltage gain and no input are reduced. An amplification circuit that does not have to be obtained can be obtained, and as a result, the same voltage gain can be obtained for all the amplifying circuits 70 having multiple stages.

(L-3) Effect of 12th Embodiment

According to the amplifying circuit 70 of the twelfth embodiment, the following effects (a) to (i) can be obtained. As a result, according to the sensor substrate and the inspection apparatus of the twelfth embodiment, it is much more accurate than before. You can run the test. Some of the following effects can be brought about according to the reasons described in the above-described embodiments.

(a) A differential amplification operation can be realized in which the gain is not affected by the threshold voltage Vt or bias current of each MOS transistor, and is determined by the ratio of the gate size and the number of transistors of each MOS transistor.

(b) In the case of a reversed-phase output amplifier using an operational amplifier (Op Amp), the gain determining negative feedback resistor lowers the input impedance as the amplifying circuit, but in the amplifying circuit of the above embodiment, the input impedance is the gate input impedance of the MOS transistor. Therefore, the input impedance as the amplification circuit can be maintained at high impedance.

(c) Although diode impedance is used, linearity is ensured in the operating range where each MOS transistor can be regarded as a saturation operation, and waveform distortion is not caused.

(d) By matching the structure of the load and source impedance MOS transistors, the ratio of load impedance to source impedance does not change from low frequency to high frequency, and flat gain characteristics can be obtained from low frequency to high frequency.

(e) Since the loop negative feedback circuit from the output to the input, such as an operational amplifier circuit, is unnecessary, there is no fear of oscillation.

(f) Since the loop negative feedback circuit from the output to the input is unnecessary, the bias voltage at the input portion and the bias voltage at the output portion can be set to free values.

(g) An N-type (or P-type) single-type MOS transistor, which is a circuit that does not use a resistance element, and therefore, when IC is formed, the transistor generation process of any one of P-type (or N-type) The resistance generation step becomes unnecessary, and the manufacturing cost can be reduced and the short delivery time can be achieved.

(h) Similarly to the fourth to sixth embodiments, by matching the voltage drop between the corresponding elements, even when the threshold voltage Vt of the MOS transistor is varied, the rectified output DC bias voltage is always constant at no input. A circuit can be obtained.

(i) When the amplification circuit of the above embodiment is connected in parallel between the power supply lines, the power supply voltage of the amplifier far from the power supply terminal decreases due to the voltage drop caused by the power supply line current and the power supply line resistance. With respect to the power supply voltage drop, it is possible to obtain an amplifier circuit in which the voltage gain and the output DC bias voltage at the time of no input do not fluctuate.

(L-4) Modified Embodiments of the Twelfth Embodiment

FIG. 18 is a circuit diagram showing a partially modified amplifier circuit 70A of the amplifier circuit 70 of the twelfth embodiment.

The amplifying circuit 70A, in the amplifying circuit 70 of the twelfth embodiment, has a power supply level at which a gate and a drain connected between the electrostatic source Vdd and the electrostatic source terminal Vd of the differential amplifier 72 are connected. The shift diode-ized MOS transistors MLs are divided into first and second power level shift diode-ized MOS transistors MLsa and MLsb, each as a load element, and the first and second load diode diode transistor blocks 42a and 42b).

The amplification circuit 70A also has the same effect as the amplification circuit 70 of the twelfth embodiment.

Fig. 19 is a circuit diagram showing an amplifier circuit 70B in which the amplifier circuit 70 of the twelfth embodiment is partially modified.

The amplifying circuit 70B, similarly to the amplifying circuit 70A, supplies the power supply level shift diode MOS transistors MLs in the amplification circuit 70 of the twelfth embodiment to the first and second power supply level shift diode MOSs. Divided into transistors MLsa and MLsb.

In addition, the amplifying circuit 70B is a suction constant current setting configured by (1) the constant current source output MOS transistor Mis and the diode transistors Mis1 to Mis3 connected by finite series / parallel connection in the amplifying circuit 70A. Remove the diode transistor block 74, the constant current source level shift transistor bias constant current source Iss, and the first and second source follow load constant current sources Ida and Idb of the source follow circuit 44, and instead And (2) a reference constant current configured by finite series / parallel connection of diode-forming transistors Mis2 to Mis4, in which a gate and a drain are connected to a source of a constant current source level shift MOS transistor (Miss) to form a diode between the drain and the source. One end of the setting diodeization transistor block 75 is connected, and (3) a gate serving as an input terminal of the current mirror circuit (3-1) at the other end of the reference constant current setting diodeization block 75; De A constant current setting diode-ized MOS transistor Mis1 which connects a lane and a source which is a common terminal of this current mirror circuit to a negative power supply Vee, and (3-2) a suction constant current source terminal of the differential amplifier 72A. A first current mirror current output MOS transistor Mm1 for connecting a drain to (Is), a gate to an input terminal of the current mirror circuit, and a source to a common terminal of the current mirror circuit; (3-3) Second current mirror current output MOS transistor Mm2 which connects the drain to the source of the first source follow MOS transistor M3a, the gate to the input terminal of the current mirror circuit, and the source to the common terminal of the current mirror circuit. ) And (3-4) a third connecting a drain to a source of the second source follow MOS transistor M3b, a gate connected to an input terminal of the current mirror circuit, and a source connected to a common terminal of the current mirror circuit. Current mirror former Output is constructed by connecting the MOS transistor (Mm3).

The reference constant current setting diode transistor block 75 corresponds to the reference constant current setting resistor Rsss in the ninth embodiment shown in FIG.

Therefore, the effects of the suction constant current source 73B and the source follower circuit 44B in the amplifying circuit 70B are the same as in the ninth embodiment.

(M) thirteenth embodiment

Next, a thirteenth embodiment of a sensor substrate and an inspection apparatus according to the present invention will be described with reference to the drawings. The thirteenth embodiment differs from the above-described embodiment only in the amplification circuit in the sensor circuit 8, so that the amplification circuit in the thirteenth embodiment will be described below.

Fig. 20 is a circuit diagram showing the construction of the amplifier circuit according to the thirteenth embodiment, in which the same and corresponding parts as those in the above-described drawings are denoted with the same and corresponding reference numerals.

The amplifying circuit 80 according to the thirteenth embodiment replaces the source follower circuit 44 of the amplifying circuit 70A in the first modified embodiment of the twelfth embodiment shown in FIG. 18 with the full-wave rectifying circuit 61. Is replaced by.

The full-wave rectifying circuit 61 has the same configuration as the full-wave rectifying circuit 61 in the amplifying circuit 60 of the tenth embodiment shown in FIG. 12 and brings the same effect.

Even if the threshold voltage Vt of the MOS transistor fluctuates, the operation in which the voltage gain and the rectified output DC bias voltage at the time of no input are always constant is the same as in the twelfth embodiment or its modified embodiment, and the differential amplifier 72A In the simple differential amplification operation, the source follower circuit 44 connected to the constant output and suboutputs Vop and Von is replaced with the full-wave rectifying circuit 61 at the first and second input terminals Vin1 and Vip1. Change to the operation of the differential amplifier circuit with the full wave rectifier circuit.

Similarly to the twelfth embodiment and its modified embodiment, when the amplifier circuits are connected in parallel in multiple stages between the power supply lines (see Fig. 13), the amplification is far from the power supply terminal due to the voltage drop caused by the power supply line current and the power supply line resistance. Although the power supply voltage of a circuit falls, the differential amplifier circuit with a full wave rectification circuit which the voltage gain and no output DC bias voltage do not fluctuate with respect to this fall of the power supply voltage can be obtained.

The amplifying circuit 80 according to the thirteenth embodiment can also produce the same effects as those of the twelfth embodiment, and the output can be a full-wave rectified output. As a result, the sensor substrate and inspection of the thirteenth embodiment According to the apparatus, the inspection can be performed with higher accuracy than before.

The amplifying circuit 80 according to the thirteenth embodiment replaces the source follower circuit 44 of the amplifying circuit 70A in the first modified embodiment of the twelfth embodiment shown in FIG. 18 with the full-wave rectifying circuit 61. Although substituted with, you may substitute by another circuit.

Fig. 21 shows an amplifying circuit 80A in which the source follower circuit 44B in the amplifying circuit 70B in the second modified embodiment of the twelfth embodiment is replaced with the full-wave rectifying circuit 61B (in the thirteenth embodiment). The first modified embodiment of the present invention is shown in FIG. 22, and the peak follower circuit 62 with a reset is used for the source follower circuit 44 of the amplifying circuit 70A in the first modified embodiment of the twelfth embodiment. The amplifier circuit 80B (second modified embodiment to the thirteenth embodiment) substituted with "

The operation and effect of the amplifying circuit 80A shown in FIG. 21 and the amplifying circuit 80B shown in FIG. 22 can be easily understood by the description of the above-described embodiment, and the description thereof is omitted.

(N) Other Embodiments

Also in the description of each of the above embodiments, various modified embodiments have been mentioned, but modified embodiments illustrated below are further mentioned.

(N-1) An amplifier circuit for adding an additional circuit such as a source follower circuit, a full-wave rectifier circuit, or a peak hold circuit with a reset to the differential amplifier circuit may satisfy the following conditions and the like. It is not limited to the modified embodiment.

In the amplifying circuit to which the additional circuit is added, the equations (23) to (25) described above are always described for the variation of the threshold voltage Vt of the MOS transistor and the electrostatic source and the negative power supply voltages Vdd and Vee. It is a point to make it hold, and the premise is that conditions 1 and 2 shown in equations (20) and (22) hold. The following formulas (23) to (25), (20) and (22) are again listed below.

Vdd-Vop1 = Vdd-Von1 = Vb1-Vee... (23)

Vo1 = Vdd-Vb1 + Vee. (24)

Vo1 = Vdd-ΔVdd-Vb1 + Vee + ΔVee

   = Vdd-Vb1 + Vee. (25)

Vdd-Vop = Vdd-Von = Vb1o-Vee... (20) (condition 1)

Vop-Vop1 = Von-Von1 = Vb1-Vb1o... (22) (condition 2)

It is not limited to the above-described embodiment of the amplifier circuit or its modified embodiment as long as it is a circuit configuration that satisfies the above conditions 1 and 2.

For example, as in the amplifying circuit 90 of the fourteenth embodiment shown in Fig. 23, the constant current source level shift transistor bias constant current Is value and the suction constant current Is value of the differential amplifier are made the same value, and the constant current is the same. When the role of the original output MOS transistor Mis serves as the constant current source level shift transistor Miss, the voltage between the gate and the source of the first and second source follow MOS transistors M3a and M3b is a constant current. Not the voltage between the gate and the source of the one-level shift transistor Miss, but equal to the diode voltage of any one of the constant current setting diode transistor blocks (Mis1 to Mis4 in Fig. 23), and the diode of the remaining constant current setting diode transistor. The sum of the voltage and the voltage between the gate and the source of the constant current source level shift transistor (Miss) is the load diode diode transistor block (Fig. 23). MLsa~ML3a, or, when is equal to the sum of the diode voltage of MLsb~ML3b).

In addition, the voltage between the gate and the source of the constant current source level shift transistor Miss is equal to the voltage between the gate and the source of the first and second source follow MOS transistors M3a and M3b. The sum of the diode voltages of the transistor blocks (Mis1 to Mis4 in Fig. 23) and the diode voltages of the load diode diode transistor blocks (MLsa to ML3a or MLsb to ML3b in Fig. 23) may be the same.

For example, similarly to the amplifier circuit 91 of the fifteenth embodiment shown in FIG. 24, on the contrary, a current mirror circuit is used in the constant current Is of the generation circuit of the suction constant current Is to the differential amplifier. The constant current source level shift transistor bias constant current Iss or the source follow load constant currents Ida and Idb of the first and second source follow MOS transistors M3a and M3b may be generated.

Furthermore, when the output unit is not a source follow output circuit configuration, but a full wave rectifier circuit configuration or a peak hold circuit with reset, the source follow load current Ida of the first and second source follow MOS transistors M3a and M3b. ) Becomes a small current, so the constant current Iss of the constant current source level shift MOS transistor miss also becomes a small current. In this case, as in the amplification circuit 92 of the sixteenth embodiment shown in Fig. 25, a relatively large suction constant current Is of the differential amplifier section and a constant current Iss of the constant current source level shift MOS transistor miss which are minute currents. A second reference constant current generating circuit for generating an intermediate second reference constant current Isss of, and using the current mirror circuit, at this second reference constant current Isss, the suction constant current Is of the differential amplifying section, The constant current Iss of the constant current source level shift MOS transistor Miss and the source follow load current Ida of the first and second source follow MOS transistors M3a and M3b may be generated.

The structure of the amplifier circuit 92 of the sixteenth embodiment shown in FIG. 25 can be applied to the case where the same resistance and MOS transistor as in the fourth through ninth embodiments are mixed, and in FIG. The amplifier circuit 93 of the embodiment is shown. In the amplifier circuit 93, the voltage drop of the second reference constant current setting resistor Rsss of the differential amplifier circuit suction constant current source side and the voltage drop of the load side resistors RLa and RLb are matched. Between the source potential Vb1o and the negative power supply Vee of the constant current source level shift MOS transistor Miss, a second constant current source level shift MOS transistor Misss and a current mirror current reference MOS transistor Mis1, and two MOSs. Since the transistor is connected, accordingly, the load-side power supply level shift diode-ized MOS transistor also connects MLs1 and MLs2 and two MOS transistors.

Among the conditions 1 and 2, it is preferable to match the bias voltage between the drain and the source of the corresponding transistor.

(N-2) The signal source for supplying a signal to the amplifying circuit provided in the sensor substrate of the present invention is also not limited to the signal sources of the above embodiments, but may be applied to the signal sources illustrated below. For example, the signal picked up by the sensor electrode on the sensor substrate described above may be regarded as a signal from a signal source representing the following equivalent circuit when supplied to the amplifier circuit and supplied to the amplifier circuit.

The signal source shown in FIG. 27 includes an input DC bias power supply Vidc having an input bias resistor Ri connected to an output, and an input AC signal source Vs having an input DC decoupling capacitor Ci connected to an output. It is a signal source of the configuration connected in parallel between the ground and the signal source output (Vso). A high pass filter is formed from these resistors Ri and capacitance Ci.

The signal source shown in Fig. 28 is an unbalanced type in which the output of the signal source shown in Fig. 27 is the constant output (Vspo) and the output of the input DC bias power supply (Vidc) is the negative output (Vsno) of the signal source. Differential signal source.

The input bias resistor Ri in the signal source shown in Figs. 27 and 28 may be an input bias MOS resistor or a diode-ized MOS transistor for input bias resistors. FIG. 29 replaces the input bias resistor Ri of the signal source shown in FIG. 28 with the input bias MOS resistor. Fig. 30 shows the input bias resistor Ri of the signal source shown in Fig. 28 as a series circuit of the diode-ized MOS transistor for the input bias resistor. Fig. 31 shows the input bias resistor of the signal source shown in Fig. 28. (Ri) is configured as a parallel circuit of a diode-ized MOS transistor for an input bias resistor.

The amplification circuits of the above embodiments each having a differential amplifier section show that the AC signal source amplifies a signal from an unbalanced differential signal source in which the AC signal source is a phase signal, but the AC signal source has a normal output and an inverse phase output. It may be applied to amplify a signal from a balanced differential signal source.

32 to 36 show the configuration of a balanced differential signal source corresponding to the various unbalanced differential signal sources described above.

(N-3) In the above embodiments, various descriptions have been made as current mirror circuits, but needless to say, current mirror circuits having different configurations may be applied.

For example, a current mirror circuit having the configuration shown in FIG. 37 may be applied. Fig. 37 shows a plurality of MOS transistors Mis1 to Mis3 (not limited to three) diodes connected with a drain and a gate between the source and the sub power source Vee of the constant current source output MOS transistor Mis. The constant current setting diode block for constituting the constant current is connected, and the generated constant current Iss is flowed to the current mirror current reference transistor Mis1 diode-connected by connecting the gate and the drain, and the current mirror current reference transistor Mis1 A current mirror circuit comprising a current mirror current output MOS transistor (Mm1 to Mm2) that connects a gate to a gate of the gate, a source is connected to a source of the current mirror current reference transistor Mis1, and outputs a constant current at the drain. As a current mirror circuit in which the code connection MOS transistors Mis2, Mm1a, and Mm2a are further added, they are not limited to these configurations.

(N-4) Each of the above embodiments shows that there is only one suction constant current source that draws constant current from the first and second differentially amplified MOS transistors M1a and M1b, but as shown in FIG. It may have a constant current source.

In Fig. 38, the source resistor Rs corresponding to the sum of the conventional first and second negative feedback source resistors Rsa and Rsb is the source of the first and second differentially amplified MOS transistors M1a and M1b. The first and second suction constant current sources Isa and Isb, which are connected to each other and divide the single suction constant current source into two, respectively, and flow the suction constant current of half of the conventional constant current value Is, respectively. The second differentially amplified MOS transistors M1a and M1b are connected to respective sources.

Even in the case where the two-stage lamination structure shown in Fig. 38 is applied, it is necessary to hold the conditions 1 and 2 described above.

The suction constant current source shown in each of the above embodiments may be replaced with the suction constant current source shown in the other embodiments as far as possible.

As a circuit having an approximate operation with a suction constant current source, a high resistance is connected between the connection terminals of the first and second negative feedback source resistors Rsa and Rsb and the negative power supply Vee, so as to apply the same. You may also

(N-5) The various power sources in the amplifying circuits of the above embodiments may be 0 V (grand connection), or may share one power source when they are the same voltage.

(N-6) The PN polarities of the respective MOS transistors in the amplifying circuits of the above embodiments may be reversed, and the same operation may be performed even when the power supply voltage relationship is reversed.

(N-7) First and second configurations of various embodiments that do not include the first and second cascode connection transistors M2a and Msb, the high pass compensation capacitor Cp, and the high pass cut capacitor CL. The cascode connection transistors M2a and Msb, the high compensation capacitor Cp and the high cut capacitor CL may be added.

(N-8) In the amplification circuits of the above-described embodiments, the normal output and the reversed phase output, either the Vop terminal or the Von terminal, or the Vop11 terminal or the Von1 terminal may be removed to form a single phase output. What is necessary is just to set it as an appropriate piece output according to the structure of the tester part 11. As shown in FIG.

In this case, when the single-phase output is performed, one of the elements, which are not necessary, for example, the first or second load diode diode transistor block or the two source follower circuit portions in the source follower circuit may be omitted.

With single phase output, the number of circuit elements is reduced, and the chip area can be reduced in the case of ICization.

(N-9) A half-wave is omitted by omitting any one of the first and second source follow MOS transistors M3a and M3b of the full-wave rectifying circuit in each of the above embodiments or the peak hold circuit with a reset. The amplifying circuit may include a wave rectifier circuit or a reset half-wave peak hold circuit.

(N-10) In addition to the above description, if combinations are possible, the technical ideas of the above embodiments may be combined and applied.

(N-11) In each of the above embodiments, a MOS field effect transistor (FET) is used as the transistor, but other unipolar transistors such as MES or MIS field effect transistors may be used.

(N-12) In the above description, the case where the sensor substrate of the present invention is used for inspection of the display substrate has been described. However, if the electrodes are arranged in a matrix and can be driven by one column, the inspection target substrate It is not limited only to a display substrate.

1 is a circuit diagram showing a configuration of a source ground amplifier circuit according to the first embodiment.

Fig. 2 is a block diagram showing a case where the source ground amplifier circuit according to the first embodiment is connected in multiple stages.

3 is a circuit diagram showing a configuration of a source ground amplifier circuit according to the second embodiment.

4 is a circuit diagram showing a configuration of an amplifier circuit according to the third embodiment.

5 is a circuit diagram showing a configuration of a differential amplifier circuit according to a fourth embodiment.

Fig. 6 is a block diagram showing a case where the differential amplifier circuit of the fourth embodiment is connected in multiple stages.

7 is a circuit diagram showing a configuration of a differential amplifier circuit according to a fifth embodiment.

Fig. 8 is a circuit diagram showing the construction of an amplifier circuit according to the sixth embodiment.

9 is a circuit diagram showing a configuration of an amplifier circuit according to the seventh embodiment.

Fig. 10 is a circuit diagram showing the construction of an amplifier circuit according to the eighth embodiment.

Fig. 11 is a circuit diagram showing the construction of an amplifier circuit according to the ninth embodiment.

12 is a circuit diagram showing a configuration of an amplifier circuit according to the tenth embodiment.

Fig. 13 is a block diagram showing a case where the amplifier circuit of the tenth embodiment is connected in multiple stages.

Fig. 14 is a circuit diagram showing the construction of an amplifier circuit according to the first modified embodiment of the tenth embodiment.

Fig. 15 is a circuit diagram showing the construction of an amplifier circuit according to the second modified embodiment of the tenth embodiment.

Fig. 16 is a circuit diagram showing the construction of an amplifier circuit according to the eleventh embodiment.

Fig. 17 is a circuit diagram showing the construction of an amplifier circuit according to the twelfth embodiment.

Fig. 18 is a circuit diagram showing the construction of an amplifier circuit according to the first modified embodiment of the twelfth embodiment.

Fig. 19 is a circuit diagram showing the construction of an amplifier circuit according to a second modified embodiment of the twelfth embodiment.

20 is a circuit diagram showing a configuration of an amplifier circuit according to a thirteenth embodiment.

Fig. 21 is a circuit diagram showing the construction of an amplifier circuit according to the first modified embodiment of the thirteenth embodiment.

Fig. 22 is a circuit diagram showing the construction of an amplifier circuit according to the second modified embodiment of the thirteenth embodiment.

Fig. 23 is a circuit diagram showing the construction of an amplifier circuit according to the fourteenth embodiment.

24 is a circuit diagram showing a configuration of an amplifier circuit according to the fifteenth embodiment.

Fig. 25 is a circuit diagram showing the construction of an amplifier circuit according to the sixteenth embodiment.

Fig. 26 is a circuit diagram showing the construction of an amplifier circuit according to the seventeenth embodiment.

Fig. 27 is a circuit diagram showing another first configuration of the signal source.

Fig. 28 is a circuit diagram showing another second configuration of the signal source.

Fig. 29 is a circuit diagram showing another third configuration of the signal source.

30 is a circuit diagram showing another fourth configuration of the signal source.

Fig. 31 is a circuit diagram showing another fifth configuration of the signal source.

32 is a circuit diagram showing another sixth configuration of the signal source.

33 is a circuit diagram showing another seventh configuration of the signal source.

34 is a circuit diagram showing another eighth configuration of the signal source.

35 is a circuit diagram showing another ninth configuration of the signal source.

36 is a circuit diagram showing another tenth configuration of the signal source.

37 is a circuit diagram showing another configuration of the current mirror circuit.

Fig. 38 is a circuit diagram showing another configuration of the suction constant current source.

39 is an explanatory diagram of a display substrate.

40 is a block diagram showing a schematic configuration of an inspection apparatus using a sensor substrate.

Fig. 41 is a schematic plan view showing a surface having a sensor electrode of a sensor substrate.

Fig. 42 is a circuit diagram showing the construction of a conventional source ground amplifier circuit.

* Description of Major Symbols in Drawings *

M1, M1a, M1b: Amplified MOS Transistors

M2a, M2b: cascode connection transistor

M3, M3a, M3b: source follow MOS transistors

MLs, MLs1, MLs2: Power Level Shift Diodeized Transistors

Mis, Misa, Misb: Constant Current Source Output MOS Transistors

Mis1: Constant Current Setting Diodeized MOS Transistor

Miss: Constant Current Source Level Shift MOS Transistor

Mm1 to Mm3: Current Mirror Current Output MOS Transistors

Cp: high pass compensation capacity CL: high pass cut capacity

Ch: Voltage holding capacity RLa, RLb: Load resistance

Rs, Rsa, Rsb: Source Resistor for Negative Feedback

Rss, Rssa, Rssb: Constant current setting resistor Rsss: Second reference constant current setting resistor

Iss: Constant Current Source Level Shift Transistor Bias Constant Current Source

Ida, Idb: Source Follow Load Constant Current Source

VpL: Switch drive pulse signal source Sw: Switch circuit

1: Display substrate 2: Pixel electrode

6: sensor substrate 7: sensor electrode

8: sensor circuit 12: inspection device

22: signal source 25: differential signal source

30, 30A, 30B: Source Ground Amplifier

31, 41a, 41b: diode transistor transistor blocks for source impedance

32, 42a, 42b: load diode diode transistor blocks

33, 43a, 43b: current mirror circuit 34: source follow and rectifier circuit

40, 51, 51A, 51B: differential amplifier circuit 44, 44B: source follow circuit

50, 50A, 50B, 60, 60A, 60B, 60C, 70, 70A, 70B, 80A, 80B, 80C, 90 to 93: amplification circuit

52, 52A, 72, 72A: differential amplifier

Is, 53, 53A, 53B, 73, 73B: Suction constant current source

61, 61B: full wave rectifier circuit

62: peak hold circuit with reset

74: Diodeized Transistor Block for Suction Constant Current Setting

75: diode-transistor block for setting constant reference current

Claims (32)

A sensor substrate in which the electrodes to be inspected are arranged in a matrix so as to face each other so as to be electromagnetically coupled without being in contact with the substrate to be driven one by one, and each of which amplifies the aligned sensor electrodes and at least a capture signal of each sensor electrode. In the sensor substrate having a sensor circuit corresponding to the sensor electrode, Amplification circuits provided in the respective sensor circuits,   An amplifying unipolar transistor whose gate is an input terminal of the amplifying circuit;   Negative feedback connected to the source side of the amplified unipolar transistor, which is formed by connecting the gate and the drain to make a diode between the drain and the source, in a series of finite (including zero) finite (parallel). negative feedback) a diode transistor block for source impedance;   A load diode diode transistor connected to the drain side of the amplified unipolar transistor, configured by directly / parallel numbering diode-connected unipolar transistors connecting a gate and a drain to a diode between the drain and the source; And   A voltage output terminal connected to a drain end of the amplifying unipolar transistor of the load diode diode block;   Equipped with   The voltage gain is determined by the ratio of the sum of the impedance of the source impedance of the amplified unipolar transistor and the impedance of the negative feedback source diode diode transistor block, and the impedance of the load diode diode transistor block. Sensor board. 2. The diode for negative feedback source impedance according to claim 1, wherein the negative feedback source impedance diode is formed between a source of the amplified unipolar transistor and a second polarity power supply which is either a positive power supply or a negative power supply. Connect the transistor block, Connecting the load diode diode transistor block between a drain of the amplified unipolar transistor and a first polarity power source that is another one of an electrostatic source or a sub-power source, And a drain connection terminal of the amplifying unipolar transistor of the load diode diode transistor as a voltage output terminal of the amplifying circuit. 2. A current mirror circuit according to claim 1, further comprising a common mirror terminal for connecting a common terminal to a first polarity power supply, which is either an electrostatic source or a negative power source, A drain of the amplified unipolar transistor is connected to an input of the current mirror circuit, The load diode diode transistor is connected between an output of the current mirror circuit and a second second polarity power source which is another one of an electrostatic source and a sub-power source, And the current mirror circuit connection terminal of the load diode diode transistor is a voltage output terminal of the amplifier circuit. The cascode gate unipolar transistor of claim 1, further comprising: a cascode connection unipolar transistor for connecting a gate to a cascode gate bias power supply; And the voltage output terminal is connected to the drain of the cascode connected unipolar transistor, and the source of the cascode connected unipolar transistor is connected to the drain of the amplified unipolar transistor. 2. The high frequency compensation capacitor (including a zero capacitance) according to claim 1, wherein a high pass compensation capacitor (including a zero capacitance) is connected between a terminal and a grand of any one of the diode transistors in the negative feedback source diode transistor block. And a high-frequency cut capacitance (including a zero capacitance) is connected between the terminal and the gland of any one diode of the load diode diode block. The sensor substrate according to claim 1, wherein a source follower / rectifier circuit that functions as a source follower circuit and a rectifier circuit is connected to the voltage output terminal. The sensor substrate according to claim 1, wherein a peak hold circuit with a reset is connected to the voltage output terminal. A sensor substrate in which the electrodes to be inspected are arranged in a matrix so as to face each other so as to be electromagnetically coupled without being in contact with the substrate to be driven one by one, and each of which amplifies the aligned sensor electrodes and at least a capture signal of each sensor electrode. In the sensor substrate having a sensor circuit corresponding to the sensor electrode, Amplification circuits provided in the respective sensor circuits,   First and second differentials, with one gate serving as the positive phase sequence input terminal of this amplifier circuit and the other gate serving as the negative phase sequence input terminal of the amplifier circuit. Amplified unipolar transistors;   A suction constant current source for setting a sum of source currents of the first and second differentially amplified unipolar transistors as a constant current;   Connected to the source side of the first and second differentially amplified unipolar transistors configured by connecting a gate and a drain to a diode between the drain and the source by a finite number (including zero). A diode transistor block for the first and second negative feedback source impedances;   First and second loads connected to the drain side of the first and second differentially amplified unipolar transistors, each having a finite series / parallel connection of a diode-ized transistor that connects a gate and a drain to a diode between the drain and the source. Diode diode transistor blocks; And   A normal output terminal on one side of the drain end of the first and second differential amplifying unipolar transistors of the first and second load diode diode transistor blocks and a reverse phase output terminal on the other side;   Equipped with   Impedance of each sum of the source impedances of the first and second differentially amplified unipolar transistors and the respective impedances of the diodes of the first and second negative feedback source impedance diode blocks, and the diodes of the first and second loads. A sensor substrate, wherein the voltage gain is determined by the ratio of the impedances of the transistor blocks. 10. The diodeization transistor block according to claim 8, wherein the first negative feedback source impedance diode block is connected between a source of the first differential amplifying unipolar transistor whose gate is a normal input terminal of the amplifying circuit and the suction constant current source. Connecting the first load diodeizing transistor block between a drain of the first differential amplifying unipolar transistor and a first first polarity power supply which is either an electrostatic source or a sub-power source, Connecting a diode transistor block for the second negative feedback source impedance between the source of the second differentially amplified unipolar transistor whose gate is the reverse phase input terminal of the amplifying circuit and the suction constant current source; And the second load diode diode transistor is connected between the drain of the second differential amplifying unipolar transistor and the first polarity power supply. 9. The apparatus of claim 8, further comprising first and second current mirror circuits for connecting a common terminal to the first polarity power supply. A drain of the amplified unipolar transistor is connected to an input of the first current mirror circuit; The second load diode diode transistor is connected between an output of the first current mirror circuit and a second second polarity power source which is another one of an electrostatic source and a sub-power source, A connection terminal of the second load diode diode transistor with the first current mirror circuit is a normal output terminal. A drain of the second amplified unipolar transistor is connected to an input of the second current mirror circuit; The first load diodeizing transistor block is connected between an output of the second current mirror circuit and the second second polarity power supply, And a connecting end of the first load diode diode transistor as the reverse phase output terminal. 9. The apparatus of claim 8, further comprising first and second cascode unipolar transistors for connecting gates to the cascode gate bias power supply. A reverse phase output terminal is connected to a drain of the first cascode unipolar transistor, A drain of the first amplified unipolar transistor is connected to a source of the first cascode unipolar transistor, A normal output terminal is connected to a drain of the second cascode unipolar transistor, And a drain of the second amplified unipolar transistor is connected to a source of the second cascode unipolar transistor. 9. The terminal of claim 8, wherein a terminal of any one diode diode in the first negative feedback source diode diode transistor block and a terminal of any diode diode in the second negative feedback source impedance diode block. Connect the high frequency compensation capacity (including 0 capacity) to A high-frequency cut capacitance (including a zero capacitance) is connected between a terminal of any one diode diode in the first load diode diode block and a terminal of any diode diode in the second load diode diode block. Sensor substrate, characterized in that. A sensor substrate in which the electrodes to be inspected are arranged in a matrix so as to face each other so as to be electromagnetically coupled without being in contact with the substrate to be driven one by one, and each of which amplifies the aligned sensor electrodes and at least a capture signal of each sensor electrode. In the sensor substrate having a sensor circuit corresponding to the sensor electrode, Amplification circuits provided in the respective sensor circuits,   First and second differential amplifying unipolar transistors in which one gate is the normal input terminal of the amplifier circuit and the other gate is the reverse phase input terminal of the amplifier circuit; and the first and second differential amplifier unipolar transistors. First and second negative feedback source resistors connected to the source side of the transistor, first and second load resistors connected to the drain side of the first and second differentially amplified unipolar transistors, and the first and second loads. A differential amplifier having a resistor having a normal output terminal on one side of a drain end of the first and second differential amplifying unipolar transistors and a reverse phase output terminal on the other side thereof;   An additional circuit comprising first and second source follower circuits having first and second source follower unipolar transistors having gates connected to the normal output terminal and the reverse phase output terminal, respectively;   A suction constant current source having a sum of source currents of the first and second differentially amplified unipolar transistors as a constant current; And   A power level shift diode transistor for shifting a power level to the differential amplifier;   Equipped with   The differential amplifier and the function of output DC bias voltage compensation for the variation of the threshold voltage of the unipolar transistor in the additional circuit are added to the suction constant current source and the power supply level shift diode transistor. Sensor substrate, characterized in that. The first negative feedback source resistor of claim 13, wherein the first negative feedback source resistor is connected between a source of the first differential amplifying unipolar transistor having a gate as a normal input terminal of the amplifying circuit and a suction constant current source terminal. The first load resistor is connected between the drain of the differential amplifying unipolar transistor and the first polarity power supply terminal, The second negative feedback source resistor is connected between a source of the second differentially amplified unipolar transistor whose gate is the reverse phase input terminal of the amplification circuit and a suction constant current source terminal, The second load resistor is connected between a drain and the first polarity power supply terminal, A drain connection terminal of the first differential amplifying unipolar transistor of the first load resistor is a reverse phase output terminal of the differential amplifier. Let the drain connection terminal of the second differential amplifying unipolar transistor of the second load resistor be a normal output terminal of the differential amplifying unit, A gate of the first source follow unipolar transistor connecting a drain to a second first polarity power supply is connected to an inverse output terminal of the differential amplifier; A first source follow load constant current source, which is an element of the additional circuit, is connected to a source of the first source follow unipolar transistor serving as a first output terminal of the additional circuit, and a drain is connected to the second first polarity power supply. A gate of the second source follow unipolar transistor connected to a normal output terminal of the differential amplifier; A second source follow load constant current source, which is an element of the additional circuit, is connected to a source of the second source follow unipolar transistor serving as a second output terminal of the additional circuit, and a first first polarity power supply and the differential amplifier Between the electrostatic source terminals, a power supply level shift diodeized unipolar transistor connected with a gate and a drain is connected so as to be forward biased, The suction constant current source has a constant current source output unipolar transistor, a constant current setting resistor, a constant current source level shift unipolar transistor, and a constant current source level shift transistor bias constant current source, The constant current setting resistor is connected between a source of the constant current source output unipolar transistor connecting a drain to a suction constant current source terminal of the differential amplifier and a first second power supply, and a gate of the constant current source output unipolar transistor A source of the constant current source level shift unipolar transistor is connected to the constant current source level shift transistor bias constant current source, A constant current source circuit gate bias power supply is connected to a gate of the constant current source level shift unipolar transistor, And a third first polarity power supply is connected to a drain of said constant current source level shift unipolar transistor. 15. The method of claim 14, wherein in place of the first and second negative feedback source resistors, a finite (parallel) parallel connection of a diode-ized transistor for connecting a gate and a drain to make a diode between the drain and the source Applying the diode transistor transistor blocks for the first and second negative feedback source impedance configured Instead of the first and second load resistors, the first and second load diode diode transistor blocks configured by directly / parallel number of diode transistors connected to a gate and a drain to form a diode between the drain and the source. Apply, Instead of the constant current setting resistors, a suction constant current setting diode transistor block configured by connecting a gate and a drain to a diode between the drain and the source by a limited number of diodeization transistors is applied. Board. 16. The diode of claim 15, wherein the power supply level shift diodeization unipolar transistor is divided into first and second power supply level shift diodeization unipolar transistors, each of which is a load element, the diode for the first and second load impedances. A sensor substrate connected to each of the transistor blocks. The method of claim 15, wherein the second source follow load constant current source of the second source follow circuit is removed, Connecting between the sources of the first and second source follow unipolar transistors to form a full-wave rectified output terminal, and connecting a voltage holding capacitance between the full-wave rectified output terminal and the ground, And said additional circuit is a full-wave rectifier circuit. 16. The method of claim 15, further comprising: removing first and second source follow load constant current sources of the first and second source follow circuits, Connecting between the sources of the first and second source follow unipolar transistors to form a peak hold output terminal, and simultaneously connecting a voltage holding capacitance between the peak hold output terminal and the ground, A switch for connecting the peak hold output terminal to the peak hold reset bias voltage intermittently in accordance with driving of a switch drive pulse signal source, And the additional circuit is a peak hold circuit with a reset. The method of claim 13, wherein the differential amplifier has a source resistance connected between the source of the first and second differential amplifying unipolar transistors in place of the first and second negative feedback source resistors, Sources of the first and second differentially amplified unipolar transistors are used as first and second suction constant current source terminals. The suction constant current source has first and second constant current source output unipolar transistors, first and second constant current setting resistors, constant current source level shift unipolar transistors, and constant current source level shift transistor bias constant current sources, Connecting the first constant current setting resistor between a source of the first constant current source output unipolar transistor and a first second polarity power supply connecting a drain to the first suction constant current source terminal, A second constant current setting resistor is connected between a source of the second constant current source output unipolar transistor connecting the drain to the second suction constant current source terminal and the first second polarity power supply, And each gate of the first and second constant current source output unipolar transistors and a source of the constant current source level shift unipolar transistor are connected to the constant current source level shift transistor bias constant current source. The constant current source unipolar transistor according to claim 13, wherein the suction constant current source has a constant current source level shift unipolar transistor, a second reference constant current setting resistor, a constant current setting diodeized unipolar transistor, and a first current mirror current output unipolar transistor. The additional circuit has the first and second source follow unipolar transistors, and the second and third current mirror current output unipolar transistors, One end of the second reference constant current setting resistor is connected to a source of the constant current source level shift unipolar transistor, At the other end of the second reference constant current setting resistor, the gate and the drain of the constant current setting diode-unipolar transistor serving as an input terminal of the current mirror circuit are connected to each other, and the current mirror is connected to a first second polarity power supply. Connecting the source of the constant current setting diodeized unipolar transistor to be a common terminal of the circuit, A drain of the first current mirror current output unipolar transistor is connected to a suction constant current source terminal of the differential amplifier, a gate of the first current mirror current output unipolar transistor is connected to an input terminal of the current mirror circuit, and A source of a first current mirror current output unipolar transistor is connected to a common terminal of the current mirror circuit, A drain of the second current mirror current output unipolar transistor is connected to a source of the first source follow unipolar transistor, and a gate of the second current mirror current output unipolar transistor is connected to an input terminal of the current mirror circuit. A source of the second current mirror current output unipolar transistor is connected to a common terminal of the current mirror circuit; A drain of the third current mirror current output unipolar transistor is connected to a source of the second source follow unipolar transistor, and a gate of the third current mirror current output unipolar transistor is connected to an input terminal of the current mirror circuit. And a source of the third current mirror current output unipolar transistor is connected to a common terminal of the current mirror circuit. 21. The method of claim 20, wherein the third current mirror current output unipolar transistor is removed, Connecting between the sources of the first and second source follow unipolar transistors to form a full-wave rectified output terminal, and connecting a voltage holding capacitance between the full-wave rectified output terminal and the ground, And said additional circuit is a full-wave rectifier circuit. 21. The method of claim 20, wherein the second and third current mirror current output unipolar transistors are removed, Connecting between the sources of the first and second source follow unipolar transistors to form a peak hold output terminal, and simultaneously connecting a voltage holding capacitance between the peak hold output terminal and the ground, A switch for connecting the peak hold output terminal to the peak hold reset bias voltage intermittently in accordance with driving of a switch drive pulse signal source, And the additional circuit is a peak hold circuit with a reset. 21. The method of claim 20, wherein in place of the first and second negative feedback source resistors, a finite number (including zero) of diodeized transistors connecting a gate and a drain to form a diode between the drain and the source is provided. Apply the diode transistor transistor block for the first and second negative feedback source impedance configured in parallel connection, Instead of the first and second load resistors, the first and second load diode diode transistor blocks configured by directly / parallel number of diode transistors connected to a gate and a drain to form a diode between the drain and the source. Apply, Instead of the second reference constant current setting resistor, a reference constant current setting diode transistor block configured by directly / parallel numbering diode-forming transistors connecting a gate and a drain to form a diode between the drain and the source is applied. Sensor board. 24. The method of claim 23, wherein the power supply level shift diodeization unipolar transistor is divided into first and second power supply level shift diodeization unipolar transistors, each of which is a load element, the diode for the first and second load impedances. A sensor substrate connected to each of the transistor blocks. 24. The method of claim 23, wherein the third current mirror current output unipolar transistor is removed, Connecting between the sources of the first and second source follow unipolar transistors to form a full-wave rectified output terminal, and connecting a voltage holding capacitance between the full-wave rectified output terminal and the ground, And said additional circuit is a full-wave rectifier circuit. 24. The method of claim 23, wherein the second and third current mirror current output unipolar transistors are removed, Connecting between the sources of the first and second source follow unipolar transistors to form a peak hold output terminal, and simultaneously connecting a voltage holding capacitance between the peak hold output terminal and the ground, A switch for connecting the peak hold output terminal to the peak hold reset bias voltage intermittently in accordance with driving of a switch drive pulse signal source, And the additional circuit is a peak hold circuit with a reset. 14. The full-wave rectifier circuit of claim 13, wherein the first and second input terminals are connected to the normal output terminal and the reverse phase output terminal of the differential amplifier part, respectively, in place of the additional circuit having the first and second source follower circuits. Sensor substrate, characterized in that the application of the additional circuit is made. 14. A reset circuit according to claim 13, wherein in place of said additional circuit having first and second source follower circuits, a reset is provided in which the first and second input terminals are connected to the normal output terminal and the reverse phase output terminal of the differential amplifier section, respectively. An additional circuit comprising a peak hold circuit is applied. 15. The method of claim 13, wherein the second source follow load constant current source of the second source follow circuit is removed, Connecting between the sources of the first and second source follow unipolar transistors to form a full-wave rectified output terminal, and connecting a voltage holding capacitance between the full-wave rectified output terminal and the ground, And said additional circuit is a full-wave rectifier circuit. 15. The method of claim 13, further comprising: removing first and second source follow load constant current sources of the first and second source follow circuits, Connecting between the sources of the first and second source follow unipolar transistors to form a peak hold output terminal, and at the same time connecting a voltage holding capacity between the peak hold output terminal and the grand, A switch for connecting the peak hold output terminal to the peak hold reset bias voltage intermittently in accordance with driving of a switch drive pulse signal source, And the additional circuit is a peak hold circuit with a reset. 14. A finite number of diodeizing transistors (including zeros) according to claim 13, in which, in place of some or all of the resistors, diodes are connected between gates and drains to diodes between drains and sources, corresponding to respective functions. A sensor substrate comprising a diode transistor block formed by parallel connection. A test substrate having an array of sensor electrodes and a sensor circuit having a sensor circuit corresponding to each sensor electrode that at least amplifies the captured signal of each sensor electrode. In the inspection apparatus for facing the inspection target substrate by electromagnetically coupling the inspection target electrode of any row of the inspection target substrate and the sensor electrode on the sensor substrate so as to be opposed to each other so as to be capable of electromagnetic coupling without contact. An inspection apparatus according to any one of claims 1, 8 and 13, wherein the sensor substrate is applied.

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