JPH06268454A - Operational amplifier output circuit - Google Patents

Abstract

PURPOSE:To extend the operation voltage range of an operational amplifier output circuit by minimum element addition and the change of layout. CONSTITUTION:A PNP transistor 2 constituted of two terminal collector output for which a second collector area is arranged so as to surround the outer side of a first collector area is provided. The second collector 63 of the PNP transistor 2 is connected to an output terminal 200, a first collector 62 is connected to an NPN transistor 5, an emitter is connected to a constant current source and a base is connected to the constant current source 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operational amplifier output circuit composed of a bipolar semiconductor integrated circuit, and more particularly to an operational amplifier output circuit capable of outputting a wide range voltage.

[0002]

2. Description of the Related Art An example of a general output circuit in a conventional operational amplifier is shown in FIG. In the figure, 1, 4, and 22 are PNP transistors, 3 and 5 are NPN transistors,
50 is a constant current source, 100 is a power source, 200 is an output terminal, 3
00 is a ground and 400 is an input terminal.

Next, the operation will be described. The conventional output circuit shown in FIG. 3 is a circuit generally called a class AB output stage. Usually, a signal from a differential amplifier circuit is input from an input terminal 400, and this input signal is voltage-amplified by an NPN transistor 5 to generate an NPN signal. Transistor 3 and PNP
It is supplied as the base voltage of the transistor 4. This circuit is usually composed of an emitter follower circuit, and is a circuit that only performs current amplification and supplies a current to the output terminal 200 or draws a current from the output terminal 200.
In terms of voltage, the same voltage value signal as the input signal amplified by the NPN transistor 5 is output from the output terminal 200. The constant current source 50 and the PNP transistors 1 and 22 are
A constant current circuit for supplying the bias current of the NPN transistor 3 is formed.

[0004]

However, in such a conventional operational amplifier output circuit, as is apparent from the circuit configuration, the output voltage Vout is Vcc-Vbe3-Vce22≥Vout≥Vbe4 + Vce5 (1) Only the voltage within the range can be output. Where Vcc is the power supply voltage, Vbe3 is the base-emitter voltage of the NPN transistor 3, Vce22 is the collector-emitter voltage of the PNP transistor 22, Vbe4 is the base-emitter voltage of the PNP transistor 4, and Vce5 is the NPN transistor 5
Is the collector-emitter voltage of.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an operational amplifier output circuit capable of making the output voltage as wide as possible.

[0006]

According to a first aspect of the present invention, there is provided an operational amplifier output circuit in which first current supply means having one terminal connected to a second potential and emitter terminal at a first potential. A first PNP transistor having a collector terminal and a base terminal connected to the other terminal of the first current supply means,
It has a two-terminal collector output configuration in which a second collector is arranged outside the first collector so as to surround the first collector, the second collector being the output terminal, and the base terminal being the first terminal. Second PNP transistor having an emitter terminal connected to the first potential, a collector terminal at the first potential, and a base terminal at the first collector of the second PNP transistor. And a third NP with the emitter terminal connected to the output terminal
The N-transistor, the base terminal to the input terminal, the emitter terminal to the second potential, and the collector terminal to the third potential.
The fifth N connected to the base terminal of the NPN transistor of
And a PN transistor.

According to a second aspect of the present invention, in the operational amplifier output circuit, the first terminal has one terminal connected to the second potential.
Current supply means, a first PNP transistor having an emitter terminal connected to a first potential and a collector terminal and a base terminal connected to the other terminal of the first current supply means, and a base terminal of the first PNP transistor. A second PNP transistor having a base terminal, an emitter terminal connected to a first potential, a collector terminal at the first potential, a base terminal at a first collector terminal of the second PNP transistor,
A third NPN transistor having an emitter terminal connected to the output terminal, a base terminal at the input terminal, an emitter terminal at the second potential, and a collector terminal at the third NPN transistor.
Fifth NPN connected to base terminal of PN transistor
A fourth P-channel transistor and an emitter terminal connected to the output terminal, a base terminal connected to the collector terminal of the fifth NPN transistor, and a collector terminal connected to the second potential.
The NP transistor and the emitter terminal are connected to the fifth PNP.
A sixth PNP having a base terminal of the transistor connected to the collector of the fifth NPN transistor.
A transistor, one terminal connected to the collector terminal of the sixth PNP transistor, the other terminal connected to the second potential, and the emitter terminal to the collector terminal of the sixth PNP transistor, and the base to the base. A seventh NPN transistor having a terminal and a collector terminal connected to each other, a collector terminal of the seventh NPN transistor and a first NPN transistor
The second current supply means connected between the second current supply means and the potential of the second NPN transistor, the base terminal of which is connected to the base terminal of the seventh NPN transistor, and the collector terminal of which is connected to the output terminal of the eighth NPN transistor. The emitter terminal of the eighth NPN transistor is provided with a second resistor having the other terminal connected to the second potential.

An operational amplifier output circuit according to a third aspect of the present invention is the operational amplifier output circuit according to the second aspect, wherein a fourth PNP transistor, a fifth NPN transistor, and a sixth PNP transistor are included. The first resistor and the first resistor are formed on the same epitaxial island.

Further, an operational amplifier output circuit according to a fourth aspect of the present invention is the operational amplifier output circuit according to the first aspect, wherein current amplifying means is provided between the second collector and the output terminal of the second PNP transistor. Is connected.

The operational amplifier output circuit according to a fifth aspect of the present invention is the operational amplifier output circuit according to the first aspect, wherein the second collector of the second PNP transistor is not directly connected to the output terminal. A second current collector connected to the second collector of the second PNP transistor to detect the current of the second collector; and a third current supply means for supplying a current to the output terminal. The output current of the third current supply means is switched by the signal from the first current detection means.

[0011]

According to the present invention, a transistor having a two-terminal collector output structure is provided, and when the first collector is saturated, a current flows from the second collector to the output terminal. It is possible to obtain an operational amplifier output circuit that can operate even with a voltage exceeding the voltage operation range of the output circuit.

Further, according to the present invention, when the output voltage falls below the normal voltage range and the normal output circuit does not operate, the circuit configuration is such that current is drawn from the output terminal. It is possible to obtain an operational amplifier output circuit that can operate even at a voltage lower than the voltage operation range of the circuit.

Further, in the present invention, in the operational amplifier output circuit according to claim 2, the fourth PNP transistor, the fifth NPN transistor, the sixth PNP transistor, and the first resistor are made the same epitaxial. By forming it on the island, it is possible to significantly reduce the layout area.

Further, according to the present invention, an operational amplifier output circuit capable of amplifying an output current is provided by providing a transistor having a two-terminal collector output configuration and connecting a current amplifying means to the second collector of the transistor. Obtainable.

Further, according to the present invention, the first current detecting means and the third current supplying means are provided, and the third current supplying means is switched by the first current detecting means. It is possible to obtain an operational amplifier output circuit capable of supplying a constant current to the output as needed.

[0016]

EXAMPLES Example 1. 1 is a circuit diagram showing an operational amplifier output circuit according to a first embodiment of the present invention. In the figure, 1 and 4 are PNP transistors, 2 is a multi-collector output type PNP transistor, 62 is the first collector of the PNP transistor 2, 63 is the second collector of the PNP transistor, and 3 and 5 are NPN transistors,
50 is a constant current source, 100 is a power source, 200 is an output terminal, 3
00 is a ground and 400 is an input terminal. In the PNP transistor 2, the first collector is connected to the base of the NPN transistor 3, and the second collector is NP.
It is connected to the emitter of the N-transistor 3.

FIG. 2A is a plan view of a semiconductor integrated circuit of the multi-collector output type PNP transistor 2 used in the first embodiment of the present invention. In the figure, 60 is an N type epitaxial region, which is usually
It is called "island". 61 is a P-type region for the emitter,
62 is a P-type region, a first collector, 63 is a P-type region, and a second collector is 64, and an N-type region is forming a base. Further, 65 to 68 are base 64,
First collector 62, emitter 61, second collector 6
The contacts 69 and 72 are metal wirings corresponding to the base 64, the first collector 62, the emitter 61, and the second collector 63, respectively.

FIG. 2 (b) is a view showing a cross section taken along the line AB of FIG. 2 (a). In the figure, the same reference numerals as those in FIG. 2 (a) are used.
The same or corresponding portion is shown, and 73 is a floating collector.

The structure of this embodiment is basically a multi-collector structure of a lateral PNP transistor in which the first collector 62 surrounds the emitter 61 and the second collector 63 surrounds the outside thereof. .

Next, the operation will be described with reference to FIGS. 1 and 2 (b). Like the conventional operational amplifier circuit, the output voltage Vout
However, if Vcc-Vbe3 -Vce2 ≥ Vout ≥ Vbe4 + Vce5 (1), the operation of the circuit of this embodiment is similar to that of the conventional circuit, and is as follows. Here, Vcc is the power supply voltage, Vbe3 is the base-emitter voltage of the NPN transistor 3, Vce2 is the first collector-emitter voltage of the PNP transistor 2, Vbe4 is the base-emitter voltage of the PNP transistor 4, and Vce5. Is the collector-emitter voltage of the NPN transistor 5.

Normally, a signal from the differential amplifier circuit is input from the input terminal 400, this input signal is voltage-amplified by the NPN transistor 5 and supplied as the base voltage of the NPN transistor 3 and the PNP transistor 4. This circuit is composed of an emitter follower circuit, which is a circuit that only performs current amplification, supplies current to the output terminal 200, and draws current from the output terminal 200. The same voltage value signal as the input signal amplified by the transistor 5 is output to the output terminal 20.
It is output from 0. The constant current source 50 and the PNP transistors 1 and 2 form a constant current circuit for supplying the bias current of the NPN transistor 5. However, the operation of the multi-collector type PNP transistor 2 within the range of the output voltage Vout is as follows. Since the multi-collector type PNP transistor 2 is configured as shown in FIG. The holes are concentrated in the first collector 62 near the emitter, and most of the current injected from the emitter 61 flows into the first collector 62,
The collector 63 is in a state in which almost no current flows.

Next, the operation of this embodiment when the output voltage Vout is Vcc5-Vbe3-Vce2 <Vout≤Vcc-Vce'2 (2) will be described. In addition, Vce'2
Is a voltage between the emitter and the second collector of the PNP transistor 2. In FIG. 1, when the input signal 400 becomes lower in voltage and the base current of the NPN transistor 5 becomes smaller, the collector current of the NPN transistor 5 becomes smaller, so that the collector potential of the NPN transistor 5, that is, the first of the PNP transistor 2 becomes smaller. Collector potential rises. Therefore, the multi-collector type PNP
Since the potential of the first collector 62 of the transistor 2 rises above the saturation voltage, no current flows through the first collector 62, the NPN transistor 3 is cut off, and no current can be supplied to the output 200. However, in this circuit, the multi-collector PNP transistor 2
However, since the structure is as shown in FIG. 2B, when the first collector 62 is saturated, the holes do not flow to the first collector and flow to the second collector 63. That is, the emitter injection current that could not be absorbed by the first collector 62 flows into the second collector 63. Therefore, current is supplied to the output terminal 200 through the second collector 63, and the current can be increased to Vout.apprxeq.Vcc-Vce'2, which operates as a so-called class A output stage.

As described above, in the first embodiment, 2
The second collector 63 is provided with the transistor 2 having a terminal collector output configuration, and when the first collector 62 is saturated.
With the configuration in which the current flows from the output terminal 200 to the output terminal 200, it is possible to obtain an operational amplifier output circuit that can operate even with a voltage exceeding the voltage operation range of the conventional operational amplifier output circuit.

Example 2. FIG. 4 is a circuit diagram showing an operational amplifier output circuit according to the second embodiment of the present invention. In the figure, 1, 4, 6 and 22 are PNP transistors, and 3,
Reference numerals 5, 7 and 8 are NPN transistors, 50 and 51 are constant current sources, 9 and 10 are resistors, 100 is a power supply, 200 is an output terminal, 300 is a ground, and 400 is an input terminal.

Next, the operation of the second embodiment will be described with reference to FIG. Like the conventional operational amplifier circuit, the output voltage Vou
When t is in the range of Vcc-Vbe3 -Vce22≥Vout≥Vbe4 + Vce5 (1), the operation of the circuit of this embodiment is similar to that of the conventional circuit, and is as follows. When a signal from the differential amplifier circuit is input from the input terminal 400, this signal is NP
The voltage is amplified by the N transistor 5 and supplied as the base voltage of the NPN transistor 3 and the PNP transistor 4. This circuit is usually composed of an emitter follower circuit, and is a circuit that performs only current amplification and supplies current to the output terminal 200 and draws current from the output terminal 200. Further, in terms of voltage, the circuit is output from the output terminal 20 as the same voltage signal as the input signal amplified by the NPN transistor 5. Constant current source 5
0 and PNP transistors 1 and 22 form a constant current circuit for supplying the bias current of the NPN transistor 3. Further, since the emitter terminal of the PNP transistor 6 is connected to the base terminal of the NPN transistor 5 and the base terminal thereof is connected to the collector terminal of the NPN transistor 5, the PNP transistor 6 has N in the output voltage range.
Since the collector and base of the PN transistor 5 are reverse biased (collector voltage> base voltage),
Further, the base and emitter of the PNP transistor 6 are also reverse biased (base voltage> emitter voltage), and both are in the cutoff state.

In this state, the NPN transistor 7 and the NPN transistor 8 and the resistors 9 and 10 connected to the respective emitter terminals form a so-called current mirror circuit. , And the collector current of the NPN transistor 8 has the following relationship. kT / q * ln (Ic7 / Ic8) + Ic7 * R9-Ic8 * R10 = 0 (3) However, all NPN transistors have the same size and the base current is ignored. Here, k: Boltzmann constant T: absolute temperature q: charge Ic7,8: collector current of NPN transistors 7 and 8 R9, R10: resistance value of resistors 9 and 10, for example, when R9 = R10, I51 is a constant current source If the current is 51, then Ic7 = I51, so Ic8 = Ic7 = I
51 (constant current source output current), output terminal 200 to N
This current is drawn as the collector current Ic8 of the PN transistor 8.

Next, the operation in the region where the output voltage Vout is Vce5≤Vout <Vbe4 + Vce5 (4) will be described. Input signal 400
When the collector voltage of the NPN transistor 5 becomes sufficiently low and becomes equal to the emitter voltage in a state where the voltage rises and the base current of the NPN transistor 5 is sufficiently supplied, a so-called saturated state is reached. In this state, the base voltage becomes higher than the collector voltage, and the base-collector is in the forward bias state, that is, the current flows from the base to the collector. Therefore, the base-emitter of the PNP transistor 6 is also in the forward bias state,
A current flows from the emitter to the base, and further a current flows to the collector. If this current is Ic6,
From the equation (3), there is a relation of kT / q * ln (Ic7 / Ic8) + (Ic7 + Ic6) * R9-Ic8 * R10 = 0 (5). As a result, the voltage drop in the resistor 9 increases by the amount of increase in Ic6 and the voltage of the resistor 9 increases, so that the current Ic8 flowing through the resistor 10 increases due to the current mirror circuit operation.

From the above, when the output voltage is within the normal voltage range, the current Ic8 supplies a minute current as a normal bias current source, but the output voltage is lower than the normal voltage range. Then, when the PNP transistor 4 and the NPN transistor 5, which are the normal output circuits, do not operate, the above operation makes the current Ic8 a large bias current source, and the class A operation becomes possible.

As described above, according to the second embodiment, when the output voltage falls below the normal voltage range and the normal output circuit does not operate, the circuit configuration is such that the current is drawn from the output terminal 200. It is possible to obtain an operational amplifier output circuit that can operate even at a voltage lower than the voltage operation range of the operational amplifier output circuit.

Example 3. FIG. 8 is a layout diagram showing a main part of an operational amplifier output circuit according to the third embodiment of the present invention. In the figure, 5 is an NPN transistor, which includes a collector region 503, a collector contact 504, a base wiring 505, a base contact 506, a base region 507,
It has an emitter region 508, an emitter contact 509, and an emitter wiring 510. A PNP transistor 4 has a base region 512, a base contact 513, a collector region 514, an emitter region 515, an emitter contact 516, a collector contact 517, a collector wiring 518, and an emitter wiring 519. 6 is PNP
In the transistor, base region 521, base contact 522, collector region 524, emitter region 525, emitter contact 526, collector contact 527,
It has a collector wiring 528 and an emitter wiring 529. 501 is an isolation region, 523 is an NPN transistor 5
, The base wiring of PNP transistors 4 and 6, and 530 are common epitaxial regions.

FIG. 7 is a layout diagram showing a main part of the operational amplifier output circuit according to the second embodiment. In the figure, the same reference numerals as those in FIG. 8 indicate the same or corresponding portions, 502 is an epitaxial region of the NPN transistor 5, 511 is an epitaxial region of the PNP transistor 4, and 520 is an epitaxial region of the PNP transistor 6.

The third embodiment is the PNP in the second embodiment.
The transistor 4, the NPN transistor 5, and the PNP transistor 6 are formed on the same epitaxial island (region) 530.

In the third embodiment, as is clear from comparing FIGS. 7 and 8, the PNP transistor 4, the NPN transistor 5, and the PNP transistor 6 in the second embodiment are formed on the same epitaxial island (region). By doing so, the layout area can be significantly reduced.

Example 4. FIG. 5 is a circuit diagram showing an operational amplifier output circuit according to the fourth embodiment of the present invention. In the figure, 1, 4, 13 and 14 are PNP transistors, 2 is a multi-collector output type PNP transistor, 3,
5, 11 and 12 are NPN transistors, 50 is a constant current source, 100 is a power supply, 200 is an output terminal, 300 is ground,
400 indicates an input terminal.

Next, the operation will be described. The basic operation is the same as that of the first embodiment, except that the current from the second collector 63 of the PNP transistor 2 is not supplied as it is as the output current, but the NPN transistors 11, 12 and PNP. Transistors 13 and 14
Through a so-called current mirror circuit composed of
The point is that the current is amplified and then supplied to the output terminal 200.

Assuming that the second collector terminal current of the PNP transistor 2 is I'c2, the second collector terminal current I'c
2 is the NPN transistor 11 and 1 as shown in the equation 1.
The current mirror circuit composed of 2 multiplies the emitter area ratio of the NPN transistors 11 and 12 by the current Ic1.
2 flows to the collector of the NPN transistor 12.

[0037]

[Equation 1]

Further, the collector current Ic12 of the NPN transistor 12 is amplified by the PNP transistors 13 and 14.

[0039]

[Equation 2]

However, in the equations 1 and 2, n is the area ratio SE12 / SE1 between the transistor 11 and the transistor 12.
1 and m are the area ratios SE14 / SE13 of the transistors 13 and 14. Thus, the transistor 1
1 to 14, by amplifying the second collector current I′c2 of the PNP transistor 2 in the first embodiment to a current m × n times, the output voltage Vout is in the range of Vout> Vcc−Vbe3−Vce2. The output load drive current can be amplified. If the range of the output voltage Vout is outside the above range, the operation is the same as that of the first embodiment of the present invention.

When the second collector current of the PNP transistor 2 does not flow, I'c2 =
At 0, Ic14 = 0, so that no current is supplied from the transistor 14 to the output terminal 200.

In the operational amplifier output circuit according to the fourth embodiment, the transistor 2 having a two-terminal collector output configuration is used.
By connecting a current mirror circuit which is a current amplification means to the second collector 63 of the transistor 2, an operational amplifier output circuit capable of amplifying the output current can be obtained.

Example 5. FIG. 6 is a circuit diagram showing an operational amplifier output circuit according to the fifth embodiment of the present invention. In the figure, 1, 4, 19 and 20 are PNP transistors,
2 is a multi-collector output type PNP transistor,
3, 5, 15, 16, 17 and 18 are NPN transistors, 21 is a resistor, 50, 52 and 53 are constant current sources,
100 is a power supply, 200 is an output terminal, 300 is a ground, 40
0 indicates an input terminal.

Next, the operation will be described. Example 5
Is the same as that of the first embodiment,
The difference is that the current is not directly supplied from the second collector 63 of the PNP transistor 2 as an output current, but the PNP transistor 1 is first passed through the resistor 21.
The base current of 5 makes the NPN transistor 15 conductive (ON state) when the first collector 62 of the PNP transistor 2 is saturated, and makes it non-conductive (OFF state) when it is not saturated. Next, the NPN transistor 1
This ON / OFF signal of 5 is inverted by the constant current source 52 and the NPN transistor 16, and the current mirror circuit composed of the constant current source 53 and the NPN transistors 17 and 18, and the current composed of the PNP transistors 19 and 20. Output current supply source 60 configured by adding a mirror circuit
Turn 0 ON / OFF. In this way, when the first collector 62 of the PNP transistor 2 is saturated and the NPN transistor 3 cannot supply current to the output 200,
In the fifth embodiment, the current from the second collector 63 is not directly supplied as the output current, but the output 2 is output from the PNP transistor 20 via the output current supply source 600.
By supplying a constant current to 00, a so-called class A operation is enabled, and when the PNP transistor 2 is not saturated, the supply of the constant current through the PNP transistor 20 is cut off to perform a normal class AB operation. Is something that can be done.

[0045]

As described above, according to the present invention, a transistor having a two-terminal collector output configuration is provided, and when the first collector is saturated, a current flows from the second collector to the output terminal. As a result, the voltage exceeding the voltage operating range of the conventional operational amplifier output circuit can be achieved by only adding some circuits or changing the layout without significantly changing the configuration of the conventional operational amplifier output circuit. However, there is an effect that an operational amplifier output circuit capable of operating can be obtained.

Further, according to the present invention, by adopting the circuit configuration capable of drawing the current from the output terminal,
The output voltage dropped below the normal voltage range and the normal output circuit stopped working, only by adding some circuits or changing the layout without significantly changing the configuration of the conventional operational amplifier output circuit. Even in the case, there is an effect that the class A operation can be performed.

According to the invention, in the operational amplifier output circuit according to claim 2, the fourth PNP transistor,
By forming the fifth NPN transistor and the sixth PNP transistor on the same epitaxial island, it is possible to reduce the layout area.

According to the present invention, in the operational amplifier output circuit according to the first aspect, the current amplifying means is connected to the second collector of the second PNP transistor having the two-terminal collector output configuration. There is an effect that an operational amplifier output circuit capable of amplifying an output load drive current can be obtained by only adding some circuits or changing the layout without significantly changing the configuration of the operational amplifier output circuit.

According to the present invention, in the operational amplifier output circuit according to the first aspect, the first current detecting means for detecting the current of the second collector of the second PNP transistor and the current are supplied to the output terminal. The third current supply means is further provided, and the third current supply means is switched by the first current detection means, so that the configuration of the conventional operational amplifier output circuit is not significantly changed, and Only by adding the circuit of the part and changing the layout, a constant current is supplied to the output as needed to enable class A operation,
Further, there is an effect that an operational amplifier output circuit capable of cutting the supply of the constant current and performing a normal class AB operation can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an operational amplifier output circuit according to a first embodiment of the present invention.

FIG. 2 is a plan view (FIG. 2 (a)) and a layout view (FIG. 2 (b)) showing a PNP transistor having a two-terminal collector configuration according to the first embodiment of the present invention.

FIG. 3 is a circuit diagram showing a conventional operational amplifier output circuit.

FIG. 4 is a circuit diagram showing an operational amplifier output circuit according to a second embodiment of the present invention.

FIG. 5 is a circuit diagram showing an operational amplifier output circuit according to a fourth embodiment of the present invention.

FIG. 6 is a circuit diagram showing an operational amplifier output circuit according to a fifth embodiment of the present invention.

FIG. 7 is a PNP transistor 4, an NPN transistor 5, of an operational amplifier output circuit according to a second embodiment of the present invention.
6 is a layout diagram showing an NPN transistor 6. FIG.

FIG. 8 is a PNP transistor 4, an NPN transistor 5, of an operational amplifier output circuit according to a third embodiment of the present invention.
6 is a layout diagram showing an NPN transistor 6. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 PNP transistor 2 PNP transistor of 2 terminal collector structure 3 NPN transistor 4 PNP transistor 5 NPN transistor 6 PNP transistor 7 NPN transistor 8 NPN transistor 9,10 resistor 11,12 NPN transistor 13,14 PNP transistor 15-18 NPN transistor 19, 20 PNP transistor 21 resistor 22 PNP transistor 50 to 53 constant current source 60 epitaxial layer 61 P type diffusion region (emitter) 62 P type diffusion region as the first collector 63 P type diffusion region as the second collector 64 N type Diffusion area (base) 65-68 Contact area 69-72 Metal wiring area 100 Power supply terminal 200 Output terminal 300 Ground terminal 400 Input terminal 501 Separation area 502 NPN transistor Epitaxial region of transistor 503 collector region of NPN transistor 5 504 collector contact of NPN transistor 5 505 wiring for base of NPN transistor 5 506 base contact of NPN transistor 507 base region of NPN transistor 5 508 emitter region of NPN transistor 5 509 NPN Emitter contact of transistor 5 510 NPN transistor 5 emitter wiring 511 PNP transistor 4 epitaxial region 512 PNP transistor 4 base region 513 PNP transistor 4 base contact 514 PNP transistor 4 collector region 515 PNP transistor 4 emitter region 516 PNP transistor 4 emitter contact 517 PNP transistor 4 Collector contact 518 of the base contact 523 NPN transistor 5 of the base region 522 PNP transistor 6 of the epitaxial region 521 PNP transistor 6 of the emitter wiring 520 PNP transistor 6 of the collector wiring 519 PNP transistor 4 of the PNP transistor 4 collector and PNP
Base wiring of transistors 4 and 6 524 PNP transistor 6 collector area 525 PNP transistor 6 emitter area 526 PNP transistor 6 emitter contact 527 PNP transistor 6 collector contact 528 PNP transistor 6 collector wiring 529 PNP transistor 6 emitter wiring 530 Common epitaxial region

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[Procedure amendment]

[Submission date] August 17, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

Claims (5)

[Claims] 1. An operational amplifier output circuit for current-amplifying and outputting an input signal, wherein a first current supply means having one terminal connected to a second potential, and an emitter terminal thereof set to a first potential, A first PNP transistor having its collector terminal and base terminal connected to the other terminal of the first current supply means, a first collector, and a second PNP transistor arranged outside the first PNP transistor so as to surround the first collector. A two-terminal collector output configuration having a collector of, the second collector of which is connected to the output terminal, the base terminal of which is connected to the base terminal of the first PNP transistor, and the emitter terminal of which is connected to the first potential. The second PNP transistor described above, its collector terminal at the first potential, and its base terminal at the first collector of the second PNP transistor,
A third NP having its emitter terminal connected to the output terminal
An N-transistor, a base terminal of which is the input terminal, an emitter terminal of which is the second potential, and a collector terminal of which is the third NP.
A fifth NPN transistor connected to the base terminal of the N transistor, its emitter terminal connected to the output terminal, its base terminal connected to the collector terminal of the fifth NPN transistor, and its collector terminal connected to the second potential. 4th PNP
An operational amplifier output circuit comprising a transistor. 2. An operational amplifier output circuit for current-amplifying an input signal and outputting the amplified current, the first current supply means having one terminal connected to a second potential, and the emitter terminal thereof set to a first potential. A first PNP transistor having a collector terminal and a base terminal connected to the other terminal of the first current supply means, a base terminal of which is the base terminal of the first PNP transistor, and an emitter terminal of which is the first PNP transistor. A second PNP transistor connected to a potential and its collector terminal connected to the first potential, its base terminal connected to the first collector terminal of the second PNP transistor, and its emitter terminal connected to the output terminal. A third NPN transistor having its base terminal at the input terminal, its emitter terminal at the second potential, and its collector terminal at the third NP;
A fifth NPN transistor connected to the base terminal of the N transistor, its emitter terminal connected to the output terminal, its base terminal connected to the collector terminal of the fifth NPN transistor, and its collector terminal connected to the second potential. 4th PNP
A transistor, a sixth PNP transistor whose emitter terminal is connected to the base terminal of the fifth PNP transistor, whose base terminal is connected to the collector of the fifth NPN transistor, and one terminal of which is the sixth PNP transistor. A first resistor having the collector terminal of the transistor connected to the second potential of the other terminal, an emitter terminal thereof connected to the collector terminal of the sixth PNP transistor, and a base terminal and a collector terminal thereof connected to each other, respectively. A seventh NPN transistor, a second current supply means connected between the collector terminal of the seventh NPN transistor and the first potential, and its base terminal as the base terminal of the seventh NPN transistor. 8th with its collector terminal connected to the output terminal
Operational amplifier output circuit, comprising: . 3. The operational amplifier output circuit according to claim 2, wherein the fourth PNP transistor, the fifth NPN transistor, the sixth PNP transistor, and the first resistor are:
An operational amplifier output circuit, which is formed on the same epitaxial island. 4. The operational amplifier output circuit according to claim 1, further comprising a current amplifying means between the second collector and the output terminal of the second PNP transistor. . 5. The operational amplifier output circuit according to claim 1, wherein the second collector of the second PNP transistor is not connected to the output terminal, and is connected to the second collector of the second PNP transistor. Further comprising first current detection means connected to detect the second collector current, and third current supply means connected to the first current detection means to supply current to the output terminal, An operational amplifier output circuit, wherein the output current of the third current supply means is switched by a signal from the first current detection means.