WO2006038612A1 - 論理回路 - Google Patents
論理回路 Download PDFInfo
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- WO2006038612A1 WO2006038612A1 PCT/JP2005/018342 JP2005018342W WO2006038612A1 WO 2006038612 A1 WO2006038612 A1 WO 2006038612A1 JP 2005018342 W JP2005018342 W JP 2005018342W WO 2006038612 A1 WO2006038612 A1 WO 2006038612A1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
- H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
- H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
- H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
- H03K3/288—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable using additional transistors in the input circuit
- H03K3/2885—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable using additional transistors in the input circuit the input circuit having a differential configuration
Definitions
- the present invention relates to a latch circuit and a logic circuit used for a data read circuit and the like including the same.
- Latch circuits are used in many semiconductor integrated circuits as basic element circuits of logic circuits. The configuration of a conventional latch circuit will be described.
- FIG. 1 is a diagram showing an example of a configuration of a conventional latch circuit.
- the latch circuit shown in Figure 1 is used in applications that require high-speed operation. In the following description, it is assumed that a bipolar transistor is used as an active (active) element.
- a differential transistor pair for reading and holding data (hereinafter simply referred to as “differential pair”) and a clock signal are input, and the upper stage differential is
- a differential logic circuit is used in which a differential transistor pair serving as current switching to a transistor pair and transistor stages of constant current sources are further connected vertically in the lower stage. The circuit configuration is described in detail below.
- the latch circuit includes a first differential pair (Q1, Q2) for reading data signals, a second differential pair (Q3, Q4) for holding data signals, and a first differential pair.
- a third differential pair (Q5, Q6) connected to the common emitter point P1 of the common emitter point P1 and the common emitter point P2 of the second differential pair and to which the clock complementary signal is input, and a transistor Q7 forming a constant current source Configuration.
- Reference symbols la and lb denote data input terminals to which data signals are input, and are connected to the bases of the first differential pair transistors Q1 and Q2.
- Reference numerals 2a and 2b denote clock input terminals to which a clock signal is input, and are connected to the bases of the transistors Q5 and Q6 of the third differential pair.
- Reference numerals 3a and 3b denote data output terminals for outputting a data signal, and the respective terminals are connected to the respective collectors of the transistors Q1 and Q2 of the first differential pair, and the transistor Q3 of the second differential pair , Q4 connected to each of the collectors.
- each of the data output terminals 3a, 3b is that of the base of the transistors Q3, Q4 of the second differential pair.
- Reference numeral 5 denotes a high potential power supply terminal to which the potential Vcc is supplied, and the collectors of the transistors Q1 and Q2 of the first differential pair are connected via the resistors R1 and R2, respectively.
- Reference numeral 6 is a low potential power supply terminal to which the potential Vee is supplied, and the emitter of transistor Q7 is connected.
- FIG. 4 An example of the circuit is disclosed in FIG. 4 of Japanese Unexamined Patent Publication No. 05-48402.
- FIG. 2 is a circuit example of a master-slave flip flop configured using the conventional latch circuit shown in FIG.
- the same components as those of the latch circuit shown in FIG. 1 are denoted by the same reference numerals.
- the master side circuit is configured to have the latch circuit shown in FIG. 1 and transistors Q15 and Q16.
- the collector of the transistor Q1 of the first differential pair and the collector of the transistor Q3 of the second differential pair are connected to the base of the transistor Q15.
- the base of the transistor Q16 is connected to the collector of the transistor Q2 of the first differential pair and the collector of the transistor Q4 of the second differential pair.
- the collectors of the transistors Q15 and Q16 are connected to the high potential power supply terminal 5, and the respective emitters are connected to the low potential power supply terminal 6 through the resistors R7 and R8, respectively.
- junction 4a between the transistor Q15 and the resistor R7 is connected to the base of the transistor Q4 of the second differential pair, and the junction 4b between the transistor Q16 and the resistor R8 is the base of the transistor Q3 of the second differential pair It is connected to the.
- the connection points 4a and 4b become data output terminals of the master side circuit unit.
- the emitter of the transistor Q7 is connected to the low potential power terminal 6 through the resistor R3.
- the slave side circuit has the same configuration as the master side circuit. As shown in FIG. 2, the slave circuit includes a fourth differential pair (Q8, Q9) for reading data signals, a fifth differential pair (Q10, Q11) for holding data signals, and a fourth differential pair. Make a constant current source with the sixth differential pair (Q12, Q13) connected to the common emitter point P3 of the differential pair and the common emitter point P4 of the fifth differential pair and to which the clock complementary signal is input.
- the configuration includes a transistor Q14 and transistors Q17 and Q18.
- the collector of the transistor Q17 there is a fifth difference from the collector of the transistor Q8 of the fourth differential pair.
- the collector of the dynamic pair transistor Q10 is connected.
- the base of the transistor Q18 is connected to the collector of the transistor Q9 of the fourth differential pair and the collector of the transistor Q11 of the fifth differential pair.
- the collectors of the transistors Q17 and Q18 are connected to the high potential power supply terminal 5, and the respective emitters are connected to the low potential power supply terminal 6 via the resistors R9 and R10, respectively.
- a connection point between the transistor Q17 and the resistor R9 and a connection point between the transistor Q18 and the resistor R10 are drawn out, and are respectively connected to data output terminals of the slave side circuit units of 3a and 3b. .
- the data output terminals 3a and 3b are respectively connected to the bases of the transistors Q10 and Q11 of the fifth differential pair.
- the connection points 4a and 4b of the master side circuit unit become data input terminals of the slave side circuit unit, and are connected to the bases of the transistors Q8 and Q9 of the fourth differential pair.
- the data output terminals 3a and 3b and the data output terminals 4a and 4b are output terminals of the flip flop circuit unit.
- the operation of the master-slave flip-flop is the same as that of the prior art, and hence the description thereof is omitted.
- Figure 3 shows an output waveform simulated at points 4a and 4b when a 40 Gbps input data signal is input to the data input terminals la and lb and a 40 GHz clock signal is input to the clock input terminals 2a and 2b. It is a graph showing the results calculated in As shown in FIG. 3, the input data signal is output by being retimed by the clock signal in the flip-flop circuit. The output data waveform is distorted in synchronization with the clock signal (hereinafter referred to as “clock signal interference”). It appears).
- clock signal interference the clock signal
- FIG. 4 shows the differential pairs (Q1, Q2), (Q3, Q4), (Q8, Q9), (Q10, Qll) of the data signal processing unit at the time of operation of the flip-flop circuit of FIG. Shows the potential fluctuation of the common emitter points Pl, P2, P3 and P4.
- the vertical axis is a fluctuating potential
- the horizontal axis is time.
- the fluctuating potentials of the common emitter points P2 and P3 are indicated by solid lines, which are almost equal.
- the fluctuating potential of the common emitter point P1 is indicated by an alternate long and short dash line
- the fluctuating potential of the common emitter point P4 is indicated by an alternate long and two short dashes line.
- the potential fluctuation width exceeds 0.
- the present invention has been made to solve the problems of the prior art as described above, and provides a high-speed logic circuit with an improved error rate that suppresses waveform distortion due to clock signal interference.
- the purpose is
- a logic circuit of the present invention is provided with a first differential transistor pair operating in response to an input data signal and a current supplied to the first differential transistor pair.
- a first transistor connected between the common emitter of the first differential transistor pair and the current source and operating in response to the input clock signal, and a first differential transistor pair
- a first potential stabilization circuit connected to a first connection point between the common emitter of the first transistor and the collector of the first transistor for stabilizing the potential of the first connection point.
- the potential stabilizing circuit is provided between the first differential transistor pair and the first transistor, the first transistor operates in accordance with the clock signal.
- the first transistor operates in accordance with the clock signal.
- the logic circuit of the present invention stabilizes the potential of the common emitter of the differential transistor pair that processes data signals, thereby suppressing distortion (clock signal interference) in the output waveform that occurs in synchronization with the clock signal. Thus, a high speed circuit with an improved error rate can be obtained.
- FIG. 1 is a circuit diagram of a conventional latch circuit.
- FIG. 2 is a circuit diagram of a conventional flip flop circuit.
- FIG. 3 is an example of calculation of the output waveform of the conventional flip flop circuit.
- Figure 4 is a diagram of the common emitter point of the differential pair for data processing of the conventional flip-flop circuit. It is an example of calculation showing order change.
- FIG. 5 is a circuit diagram of the latch circuit of the first embodiment.
- FIG. 6 is a circuit diagram of the flip flop circuit according to the first embodiment.
- FIG. 7 is a circuit diagram of the selector circuit of the first embodiment.
- FIG. 8 is a circuit diagram of a latch circuit according to a second embodiment.
- FIG. 9 is a circuit diagram of a flip flop circuit according to a second embodiment.
- FIG. 10 is a calculation example of the output waveform of the flip-flop circuit of the second embodiment.
- FIG. 11 is a calculation example showing the potential fluctuation of the common emitter point of the differential pair for data processing of the flip-flop circuit of the second embodiment.
- FIG. 12 is a circuit diagram of a clocked inverter type flip-flop circuit according to a second embodiment.
- FIG. 13 is a circuit diagram of a selector circuit of a second embodiment.
- FIG. 14 is a circuit diagram of a latch circuit of a third embodiment.
- FIG. 15 is a circuit diagram of a flip flop circuit according to a third embodiment.
- FIG. 16 is a calculation example of the output waveform of the flip flop circuit of the third embodiment.
- FIG. 17 is a calculation example showing the potential fluctuation at the common emitter point of the differential pair for data processing of the flip-flop circuit of the third embodiment.
- FIG. 18 is a circuit diagram of a selector circuit of a third embodiment.
- FIG. 19 is a circuit diagram of a latch circuit according to a fourth embodiment.
- FIG. 20 is a circuit diagram of a flip flop circuit according to a fourth embodiment.
- FIG. 21 is a calculation example of the output waveform of the flip flop circuit of the fourth embodiment.
- FIG. 22 is a calculation example showing the potential fluctuation of the common emitter point of the differential pair for data processing of the flip-flop circuit of the fourth embodiment.
- FIG. 23 is a circuit diagram of a selector circuit according to a fourth embodiment.
- FIG. 24 is a circuit diagram of a latch circuit of a fifth embodiment.
- FIG. 25 is a circuit diagram of a latch circuit according to a sixth embodiment.
- FIG. 26 is a circuit diagram of a latch circuit according to a seventh embodiment.
- FIG. 27 is a circuit diagram of a latch circuit according to an eighth embodiment.
- FIG. 28 is a circuit diagram of a latch circuit of a ninth embodiment.
- FIG. 29 is a circuit diagram of a latch circuit of a tenth embodiment.
- FIG. 30 is a circuit diagram of a latch circuit according to an eleventh embodiment.
- FIG. 31 is a circuit diagram of a latch circuit of a twelfth embodiment.
- FIG. 32 is a circuit diagram of a flip-flop circuit according to a twelfth embodiment.
- the logic circuit of the present invention is characterized in that a potential stabilizing circuit is provided in the common emitter of the differential transistor pair.
- FIG. 5 is a circuit diagram showing a configuration example of the latch circuit of the present embodiment.
- the same components as those of the conventional latch circuit shown in FIG. 1 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit of the present embodiment has a connection point S1 between the common emitter point P1 of the first differential pair and the third differential pair, Potential stabilization circuits 30a and 30b are respectively connected to the junction point S2 between the common emitter point P2 of the second differential pair and the second differential pair and the third differential pair.
- the potential of the common emitter point of the differential pair of the data signal processing unit is focused. Since each of the common emitter points P1 to P4 is also the output end (collector point) of the transistor that inputs the clock signal, the potential fluctuates in synchronization with the input collector signal.
- the difference between the potential level of the data signal input to the base point thereof and the potential of the common emitter point of the differential pair corresponds to the input potential.
- the collector current of the transistor is determined according to the size. The value obtained by multiplying the collector current by the load resistance is the potential level of the output signal. Therefore, when there is a large fluctuation synchronized with the clock signal as shown in FIG. 4 in the potential of the common emitter point of P1 to P4, the fluctuation is superimposed as noise on the input potential of the differential pair, and the output waveform Distortion will occur in synchronization with the clock signal.
- the potential fluctuation of the common emitter points P1 and P2 occurring in synchronization with the clock signal is reduced by the potential stabilization circuits 30a and 30b.
- the first It is possible to suppress the noise caused by the clock signal from being superimposed on the input potential of the differential pair and the second differential pair, and to obtain a good output waveform without clock signal interference.
- a logic circuit having a first differential pair (Q1, Q2), a transistor Q5 connected to a current source, and a potential stabilizing circuit 30a may be Also in this case, it is possible to obtain the effect of suppressing the clock signal interference from increasing the potential fluctuation of the common emitter point P1.
- the present invention is not limited to the latch circuit shown in FIG.
- the specific example is explained below. It may be a functional circuit such as a flip flop circuit using the latch circuit shown in FIG.
- FIG. 6 shows an example of a master-slave flip-flop circuit using the latch circuit of this embodiment.
- the same components as those of the conventional flip-flop circuit shown in FIG. 2 are designated by the same reference numerals and their detailed description will be omitted.
- the master side circuit is a junction point S1 of the common emitter point P1 of the first differential pair and the third differential pair, similarly to the latch circuit shown in FIG.
- Potential stabilization circuits 30a and 30b are respectively connected to the junction point S2 of the common emitter point P2 of the second differential pair and the second differential pair and the connection point S2 of the third differential pair.
- the slave side circuit also includes a junction point S3 between the common emitter point P3 of the fourth differential pair and the sixth differential pair, and a common emitter point P4 between the fifth differential pair and the sixth point.
- Potential stabilization circuits 30c and 30d are respectively connected to the connection points S4 of the differential pair.
- noise due to the clock signal is superimposed on the input potentials of the first differential pair and the second differential pair. Can be reduced. Moreover, as a result of reducing the potential fluctuation of P3 and P4 points generated in synchronization with the clock signal by the potential stabilization circuit 30a, 30b, a clock signal is input to the input potential of the fourth differential pair and the fifth differential pair It can suppress that the noise which originates is superimposed. Therefore, it is possible to obtain a good output waveform without clock signal interference.
- FIG. 7 is a view showing an example of a selector circuit using the latch circuit of the present embodiment.
- the same components as those of the latch circuit of FIG. 5 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit shown in FIG. 5 is used for the data reading circuit of the selector circuit. It has been In this selector circuit, as in the latch circuit shown in FIG. 5, the connection point S1 between the common emitter point P1 of the first differential pair and the third differential pair, and the common emission point between the second differential pair Potential stabilization circuits 30a and 30b are connected to the connection point S2 of the footer point P2 and the third differential pair, respectively.
- the input potentials of the first and second differential pairs are reduced. It is possible to suppress the superposition of noise caused by the clock signal, and to obtain a good output waveform without clock signal interference.
- FIG. 8 is a diagram showing a configuration example of the latch circuit of the present embodiment. The same components as those of the latch circuit shown in FIG. 5 are designated by the same reference numerals and their detailed description will be omitted.
- a capacitance C1 is provided between high potential power terminal 5 and connection point S1, and between high potential power terminal 5 and connection point S2. Is equipped with a capacity C2.
- FIG. 9 is a diagram showing a circuit example of a flip flop using the latch circuit shown in FIG.
- the same components as those of the flip flop circuit shown in FIG. 6 are designated by the same reference numerals and their detailed description will be omitted.
- a capacitor C1 is provided between high potential power supply terminal 5 and connection point S1, and high potential power supply terminal 5 and connection point S2 are provided. A capacitance C2 is provided between them.
- a capacitor C3 is provided between the high potential power supply terminal 5 and the connection point S3, and a capacitance C4 is provided between the high potential power supply terminal 5 and the connection point S4.
- Fig. 10 shows the output data waveform that is output to the connection points 4a and 4b when the 40 Gbps data signal is input to the data input terminals la and lb and the 40 GHz clock signal is input to the clock input terminals 2a and 2b. It is a graph which shows the result of making it calculate. Output data waveform shown in Figure 10 As compared with the waveform shown in FIG. 3, distortion of the waveform is suppressed.
- FIG. 11 is a graph showing the state of the potential fluctuation of the common emitter points Pl, P2, P3 and P4.
- the vertical axis is the fluctuating potential
- the horizontal axis is the time.
- the fluctuating potentials of the common emitter points P2 and P3 are indicated by solid lines
- the fluctuating potentials of the common emitter point P1 are indicated by alternate long and short dashed lines
- the fluctuating potential of the common emitter point P4 is indicated by dashed double dotted lines.
- the fluctuation range is almost in the range of-1.75 V to-1. 80 V for all common emitter points.
- the variation in potential shown in FIG. 11 is smaller than the variation in potential shown in FIG. 4 and is uniform between the connection points.
- the potentials of common emitter points Pl, P2, P3 and P4 are stabilized as compared with the prior art, and as a result, clock signal interference to the data output waveform is suppressed. .
- connection target is not limited to the high potential power supply terminal 5 and may be stable as long as it is stable (grounded), for example, ground (ground potential) or the low voltage shown in FIG.
- the potential power supply terminal 6 may be used.
- the configuration of the present embodiment is not limited to the latch circuit shown in FIG. 8 or the master slave type flip-flop circuit shown in FIG. The case where the present invention is applied to a clocked inverter type flip-flop circuit will be described.
- FIG. 12 shows a clocked inverter type flip-flop circuit.
- the same components as those of the flip-flop circuit shown in FIG. 9 are designated by the same reference numerals and their detailed description will not be repeated.
- the clocked inverter type flip flop circuit removes the second differential pair, the fifth differential pair, and the sixth differential pair from the flip flop circuit shown in FIG.
- the pair is connected to a first differential pair and a fourth differential pair.
- one terminal of a capacitor C1 is connected to a connection point S1 between the common emitter point P1 of the first differential pair and the third differential pair.
- one terminal of a capacitor C3 is connected to a connection point S3 between the common emitter point P3 of the fourth differential pair and the third differential pair.
- the other terminals of the capacitors Cl and C3 are connected to the high potential power supply terminal 5.
- FIG. 13 shows a selector circuit configured using the data read circuit that constitutes the latch circuit shown in FIG.
- capacitances Cl and C2 are provided as potential stabilization circuits of the selector circuit shown in FIG.
- One terminal of the capacitor C1 is connected to the connection point S1 between the common emitter point P1 of the first differential pair and the third differential pair, and the other terminal is connected to the high potential power supply terminal 5 .
- One terminal of the capacitor C2 is connected to the connection point S2 between the common emitter point P2 of the second differential pair and the third differential pair, and the other terminal is connected to the high potential power terminal 5 There is.
- the latch circuit shown in FIG. 8 may be applied to a wide range of logic circuits such as flip flop circuits and selector circuits.
- FIG. 14 is a view showing an example of the configuration of the latch circuit of this embodiment.
- the same components as those of the latch circuit shown in FIG. 5 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit shown in FIG. 14 is provided with a resistance dividing circuit as the potential stabilizing circuit shown in FIG.
- the connection point S1 between the common emitter point P1 of the first differential pair and the third differential pair is connected to the high potential power supply terminal 5 via the resistor R11, and the low potential power supply terminal via the resistor R12 Connected to six.
- the connection point S2 between the common emitter point P2 of the second differential pair and the third differential pair is connected to the high potential power supply terminal 5 via the resistor R13, and the low potential power supply terminal via the resistor R14. Connected to six.
- Each resistance value of the resistance division circuit is determined such that the connection points Sl and S2 have a desired potential.
- the potential applied to the high potential power supply terminal 5 is not limited to the power supply potential if it is a stable reference potential.
- FIG. 15 shows a circuit example of a flip flop using the latch circuit shown in FIG.
- the same components as those of the flip-flop circuit shown in FIG. 6 are designated by the same reference numerals and their detailed description will be omitted.
- resistors R11 and R12 connected in series between high potential power supply terminal 5 and low potential power supply terminal 6 are divided at connection point S1.
- a resistor R13 and a resistor R14 connected in series between the high potential power terminal 5 and the low potential power terminal 6 are divided at a connection point S2.
- the resistor R15 and the resistor R16 connected in series between the high potential power supply terminal 5 and the low potential power supply terminal 6 are divided at the connection point S3, and the high potential power supply terminal 5 and the low potential power supply terminal 6
- a resistor R17 and a resistor R18 connected in series between the two are divided at a connection point S4.
- Figure 16 The data signal of 40 Gbps is input to the data input terminals la and lb, and the clock signal of 40 GHz is input to the clock input terminals 2a and 2b, and the output data waveform output to the points 4a and 4b is simulated. It is a graph which shows the result of making it calculate. In the output data waveform shown in FIG. 16, distortion of the waveform is suppressed as compared to the waveform shown in FIG.
- FIG. 17 is a graph showing the state of potential fluctuation of the common emitter points Pl, P2, P3 and P4.
- the vertical axis is the fluctuating potential
- the horizontal axis is the time.
- the fluctuating potentials of the common emitter points P2 and P3 are indicated by solid lines
- the fluctuating potentials of the common emitter point P1 are indicated by alternate long and short dashed lines
- the fluctuating potential of the common emitter point P4 is indicated by dashed double dotted lines.
- the potential fluctuation at any common emitter point is within ⁇ 0.05V around -1.80V.
- the variation range is smaller than the potential variation shown in Fig. 4 and the variation range is even between the connection points.
- the potentials of common emitter points Pl, P2, P3 and P4 are stabilized as compared with the prior art, and as a result, clock signal interference to the data output waveform is suppressed. .
- the configuration of the present embodiment is not limited to the latch circuit shown in FIG. 14 or the master slave type flip-flop circuit shown in FIG. The configuration in which the latch circuit shown in FIG. 14 is used for the selector circuit will be described.
- FIG. 18 shows a selector circuit using a data read circuit constituting the latch circuit shown in FIG.
- the same components as those of the selector circuit shown in FIG. 7 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit shown in FIG. 14 is used for the data read circuit of the selector circuit.
- the resistors R11 and R12 connected in series between the high potential power supply terminal 5 and the low potential power supply terminal 6 are divided at the connection point S1 similarly to the latch circuit shown in FIG.
- a resistor R13 and a resistor R14 connected in series between the potential power terminal 5 and the low potential power terminal 6 are divided at a connection point S2.
- the latch circuit shown in FIG. 14 may be widely applied to logic circuits such as selector circuits.
- FIG. 19 is a diagram showing a configuration example of the latch circuit of the present embodiment. The same components as those of the latch circuit shown in FIG. 5 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit shown in FIG. 19 is provided with a capacitance C5 between the connection point S1 and the connection point S2 as the potential stabilization circuit shown in FIG.
- FIG. 20 shows a circuit example of a flip flop using the latch circuit shown in FIG.
- the same components as those of the flip-flop circuit shown in FIG. 6 are designated by the same reference numerals and their detailed description will be omitted.
- a capacitor C5 is provided between the connection point S1 and the connection point S2 similarly to the latch circuit shown in FIG.
- a capacitor C6 is provided between the connection point S3 and the connection point S4.
- Figure 21 shows simulated output data waveforms at points 4a and 4b when a 40 Gbps data signal is input to the data input terminals la and lb and a 40 GHz clock signal is input to the clock input terminals 2a and 2b. It is a graph showing the result calculated by the In the output data waveform shown in FIG. 21, distortion of the waveform is suppressed compared to the waveform shown in FIG.
- FIG. 22 is a graph showing the state of potential fluctuation of the common emitter points Pl, P2, P3 and P4.
- the vertical axis is the fluctuating potential
- the horizontal axis is the time.
- the fluctuating potentials of the common emitter points P2 and P3 are indicated by solid lines
- the fluctuating potentials of the common emitter point P1 are indicated by alternate long and short dashed lines
- the fluctuating potential of the common emitter point P4 is indicated by dashed double dotted lines.
- the fluctuation range for the fluctuation potentials of the common emitter points P1 and P4 is as follows:-1. 82 V to 1. 73 V at 0. 09 V. .
- the fluctuation range of the common emitter point P2 and P3 is 0. 05V.
- the potential fluctuation at each common emitter point has a fluctuation width equal to that of the potential fluctuation shown in FIG.
- the potentials of common emitter points Pl, P2, P3 and P4 are stabilized compared to the conventional one, and as a result, clock signal interference to the data output waveform is suppressed. .
- the configuration of this embodiment is the same as that of the latch circuit shown in FIG. 19 or the master thread shown in FIG. It is not limited to the loop type flip flop circuit. A configuration in which the latch circuit shown in FIG. 19 is used for the selector circuit will be described.
- FIG. 23 shows a selector circuit using the latch circuit shown in FIG.
- the same components as those of the selector circuit shown in FIG. 7 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit shown in FIG. 19 is used for the data reading circuit.
- a capacitor C5 is provided between the connection point S1 and the connection point S2.
- the latch circuit shown in FIG. 19 may be widely applied to logic circuits such as a selector circuit.
- the latch circuit of this embodiment is a combination of the second embodiment and the third embodiment.
- FIG. 24 is a view showing an example of the configuration of the latch circuit of the present embodiment.
- the same components as those of the latch circuit shown in FIGS. 8 and 14 are designated by the same reference numerals and their detailed description will be omitted.
- a capacitor C1 is provided between connection point S1 of latch circuit shown in FIG. 8 and high potential power supply terminal 5, and connection point S1 is a high potential power supply terminal.
- a resistor R11 and a resistor R12 connected in series between 5 and the low potential power supply terminal 6 are divided.
- a capacitor C2 is provided between the connection point S2 and the high potential power supply terminal 5, and the connection point S2 is connected in series between the high potential power supply terminal 5 and the low potential power supply terminal 6 and a resistor R13 and a resistor R14. Is divided.
- potential stabilization of common emitter points Pl and P2 is performed as in the second and third embodiments, and the effect of data output waveform improvement can be obtained.
- the latch circuit of the present embodiment or the data read circuit constituting the same can be used as a basic element circuit of a logic circuit in any semiconductor integrated circuit such as a flip flop circuit or a selector circuit.
- the combination of capacitance and resistance allows for more diverse layout patterns than either of the elements, thus increasing the freedom of design layout.
- FIG. 25 is a diagram showing one configuration example of the latch circuit of the present embodiment. Shown in Figure 8 and Figure 19 The same components as those of the latch circuit are designated by the same reference numerals and their detailed description will be omitted.
- capacitance C1 is provided between connection point S1 of latch circuit shown in FIG. 8 and high potential power supply terminal 5, and connection point S2 and high potential power supply terminal A capacitance C2 is provided between this and the 5th. Also, a capacitance C5 is provided between the connection point S1 and the connection point S2.
- the potential stabilization of common emitter points Pl and P2 is performed as in the second and fourth embodiments, and the effect of data output waveform improvement can be obtained.
- the latch circuit of the present embodiment or the data read circuit constituting the same can be used as a basic element circuit of a logic circuit in any semiconductor integrated circuit such as a flip flop circuit or a selector circuit. Furthermore, it can be designed by combining the capacitance values of capacitance C1 and capacitance C2 and capacitance C5, and the degree of freedom in design layout is increased.
- FIG. 26 is a diagram showing one configuration example of the latch circuit of the present embodiment.
- the same components as those of the latch circuit shown in FIGS. 14 and 19 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit includes a resistor R11 and a resistor connected in series between the high potential power supply terminal 5 and the low potential power supply terminal 6 at the connection point S1 of the latch circuit shown in FIG. R12 is divided.
- a connection point S2 divides a resistor R13 and a resistor R14 connected in series between the high potential power supply terminal 5 and the low potential power supply terminal 6.
- a capacitance C5 is provided between the connection point S1 and the connection point S2.
- the potentials of the connection points P1 and P2 are stabilized as in the third and fourth embodiments, and the effect of data output waveform improvement can be obtained.
- the latch circuit of the present embodiment or the data reading circuit constituting the same can be used as a basic element circuit of a logic circuit in any semiconductor integrated circuit such as a flip flop circuit or a selector circuit. By combining capacitance and resistance, more layout patterns can be considered than in either case, and the freedom of design layout is increased.
- FIG. 27 is a view showing an example of the configuration of the latch circuit of the present embodiment.
- the same components as those of the latch circuit shown in FIGS. 8, 14, and 19 are designated by the same reference numerals and their detailed description will not be repeated.
- the latch circuit has a configuration in which a capacitor C5 is provided between the connection point S1 and the connection point S2 of the latch circuit shown in FIG.
- connection points P1 and P2 are performed as in the second, third, and fourth embodiments, and the effect of data output waveform improvement is obtained.
- the latch circuit of the present embodiment or the data reading circuit constituting the same can be used as a basic element circuit of a logic circuit in any semiconductor integrated circuit such as a flip flop circuit or a selector circuit.
- Capacitance C1 and Capacitance C2 and Capacitance C5 just by combining the capacitance value by combining the capacitance and resistance! /, A wider variety of layout patterns can be considered than in the case of only one element, and design layout is free The degree increases.
- the latch circuit of this embodiment is one in which the potential stabilization circuits 30a and 30b in the latch circuit of the first embodiment can also adjust the external force.
- FIG. 28 is a view showing an example of the configuration of the latch circuit of the present embodiment. The same components as those of the latch circuit shown in FIG. 5 are designated by the same reference numerals and their detailed description will be omitted.
- the latch circuit has a configuration in which an external adjustment terminal is connected to the potential stabilization circuit 30a, 30b of the latch circuit shown in FIG.
- the potential stabilization circuits 30a and 30b have their circuit parameters adjusted by the voltage or current input through the external adjustment terminal.
- the potential fluctuation of the common emitter points Pl and P2 generated in synchronization with the clock signal is reduced by each potential stabilization circuit.
- noise due to the clock signal can be prevented from being superimposed on the input potentials of the first differential pair and the second differential pair, and a good output waveform without clock signal interference can be obtained.
- the second embodiment has the same effects as the first embodiment in terms of points.
- the circuit parameter of the potential stabilization circuit can be adjusted by the value of the voltage or current input to each external adjustment, whereby the clock signal interference suppression amount can be controlled so as to obtain the desired output data waveform.
- the present invention is not limited to the latch circuit shown in FIG. 28, and is configured using this latch circuit.
- the present invention is applicable to functional circuits such as flip flop circuits.
- the present invention is widely applied to logic circuits such as a selector circuit configured using a data read circuit that configures this latch circuit.
- FIG. 29 is a diagram showing a configuration example of the latch circuit of the present embodiment.
- the same components as those of the latch circuit shown in FIG. 5 are designated by the same reference numerals and their detailed description will be omitted.
- varactor diode D1 of variable capacitance is connected to connection point S1 as the potential stabilization circuit shown in FIG. 28, and varactor diode is connected to connection point S2.
- D2 is connected.
- the external adjustment terminals 7 and 8 are connected to the noractor diodes D1 and D2, respectively. If there is an abnormality in the output waveform from data output terminals 3a and 3b, it is possible to change the capacitance value of NORACARD diode D1 and D2 by adjusting the potential level input to external adjustment terminals 7 and 8. .
- the circuit parameter is the capacitance value of the varactor diodes D1 and D2.
- the capacitance value of the varactor diode is controlled, and as a result, the amount of suppression of clock signal interference is also controlled. Therefore, according to the present invention, even after the circuit chip is manufactured, the output data waveform can be improved to have a desired shape by adjusting the potential level of the external adjustment terminals 7 and 8 while monitoring the output data waveform.
- the present invention is not limited to the latch circuit shown in FIG. 29, but can be applied to a functional circuit such as a flip flop circuit configured using this latch circuit.
- the present invention is widely applied to logic circuits such as a selector circuit configured using a data read circuit that configures this latch circuit.
- FIG. 30 is a view showing an example of the configuration of the latch circuit of this embodiment.
- the latch shown in Figure 5 The same components as those of the circuit are denoted by the same reference numerals, and the detailed description thereof is omitted.
- an output waveform determination circuit 40 is connected to the potential stabilization circuit 30a, 30b of the latch circuit shown in FIG.
- the output waveform determination circuit 40 is connected to the data output terminals 3a and 3b.
- Output waveform determination circuit 40 determines whether or not the output waveform received from data output terminals 3a and 3b has a value higher than a predetermined threshold voltage due to jitter or the like, and an output including information of the determination result
- the data signal is transmitted to the potential stabilizing circuits 30a and 30b.
- the potential stabilization circuits 30a and 30b receive the output data signal, they adjust circuit parameters in accordance with the information of the determination result included in the output data signal.
- the potential stabilization circuits reduce the potential fluctuation of the connection points Pl and P2 generated in synchronization with the clock signal.
- noise due to the clock signal can be suppressed from being superimposed on the input potentials of the first differential pair and the second differential pair, and a good output waveform without clock signal interference can be obtained.
- the second embodiment has the same effects as the first embodiment in terms of points.
- the output waveform determination circuit 40 feeds back information received from the data output terminals 3a and 3b and supplies the information to each potential stabilization circuit to adjust the circuit parameter of the potential stabilization circuit, whereby a desired output data waveform is obtained. The amount of interference suppression can be controlled so as to obtain.
- the present invention is not limited to the latch circuit shown in FIG. 30, but can be applied to a functional circuit such as a flip flop circuit configured using this latch circuit.
- the present invention is widely applied to logic circuits such as a selector circuit configured using a data read circuit that configures this latch circuit.
- the latch circuit of this embodiment is provided with an error detector for feeding back error information to the varactor diode in the latch circuit of the tenth embodiment.
- FIG. 31 is a view showing an example of the configuration of the latch circuit of the present embodiment.
- the same components as those of the latch circuit shown in FIG. 29 are designated by the same reference numerals and their detailed description will be omitted.
- the error detector 50 is connected to the varactor diodes D1, D2 of the latch circuit shown in FIG.
- the error detector 50 is connected to the data output terminals 3a, 3b.
- the error detector 50 receives an output from the data output terminals 3a and 3b.
- the waveform is determined in advance, and it is detected whether the force exceeds the value voltage.
- the error detector 50 maintains the voltage value output to the varactor diodes D1 and D2 if the output waveform is smaller than the threshold voltage.
- the voltage value output to the noractor diodes D1 and D2 is changed by a predetermined amount.
- the latch diodes Dl and D2 change the capacitance value corresponding to the voltage value input from the error detector 50.
- the capacitance value of the non-nodal diode D1 or D2 is increased, the potential fluctuation range of the common emitter point P1 or P2 of the latch circuit is reduced, and the varactor diode D1 or D2 is input from the error detector 50.
- the capacitance value is increased as the voltage value is increased, the following operation is performed.
- the error detector 50 detects a portion above the threshold voltage in the output waveform, the error detector 50 increases the voltage output to the varactor diode D1, D2 by a predetermined amount.
- the noractors D1 and D2 increase the capacitance according to the voltage input from the error detector 50.
- FIG. 32 shows a circuit example of a flip flop using the latch circuit shown in FIG.
- the same components as those of the flip-flop circuit shown in FIG. 6 are designated by the same reference numerals and their detailed description will be omitted.
- the knotter diodes D1 and D2 are connected to the error detector 50.
- a varactor diode D3 is connected to the connection point S3
- a varactor diode D4 is connected to the connection point S4.
- the varactor diodes D3 and D4 are connected to the error detector 50.
- the output waveform is adjusted to have a desired shape, whereby clock signal interference is caused.
- the amount of suppression can be controlled.
- the configuration of the present embodiment is not limited to the latch circuit shown in FIG. 31 or the master slave type flip flop circuit shown in FIG. 32.
- a clocked inverter type flip flop circuit or this latch circuit These circuits are widely applied to logic circuits such as selector circuits configured using data reading circuits that make up the In the present invention, as described above, the latch circuit and the data read circuit forming the latch circuit are stabilized by setting the potential of the common emitter of the differential transistor pair that processes the data signal. The distortion of the output waveform (clock signal interference) generated in synchronization with the clock signal can be suppressed, and a high-speed logic circuit with an improved error rate can be obtained. In addition, the same effect can be obtained also in a flip flop circuit using these circuits.
- circuit parameter of the potential stabilization circuit of the common emitter variable it is possible to control the amount of suppression of clock signal interference, and to optimize the performance of the logic circuit. It will be possible to This makes it possible to control so that a desired output waveform can be obtained even when the performance of the active element and the passive element in the circuit fluctuates due to process variations and aging, so that the yield and reliability of the circuit can be improved. Have.
- the present invention has been described on the assumption that a bipolar transistor is used as the active element, the present invention is not limited to the type of the active element.
- HEMT High Electron Mobility Transistor
- FET devices such as MOSFETs.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006539294A JP4683234B2 (ja) | 2004-10-05 | 2005-10-04 | 論理回路 |
US11/576,682 US7671652B2 (en) | 2004-10-05 | 2005-10-04 | Logic circuit for use in a latch circuit and a data reading circuit or the like which includes such a latch circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-292678 | 2004-10-05 | ||
JP2004292678 | 2004-10-05 |
Publications (1)
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WO2006038612A1 true WO2006038612A1 (ja) | 2006-04-13 |
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PCT/JP2005/018342 WO2006038612A1 (ja) | 2004-10-05 | 2005-10-04 | 論理回路 |
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US (1) | US7671652B2 (ja) |
JP (1) | JP4683234B2 (ja) |
WO (1) | WO2006038612A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008211615A (ja) * | 2007-02-27 | 2008-09-11 | Hitachi Ltd | 論理回路 |
JP2011155452A (ja) * | 2010-01-27 | 2011-08-11 | Renesas Electronics Corp | 差動論理回路、分周回路、及び周波数シンセサイザ |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP6245063B2 (ja) * | 2014-05-13 | 2017-12-13 | 富士通株式会社 | コンパレータシステム |
US10315696B2 (en) | 2017-04-03 | 2019-06-11 | Robby Gordon | Rod-end front suspension |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS631212A (ja) * | 1986-06-20 | 1988-01-06 | Fujitsu Ltd | Ecl回路 |
JPS63240117A (ja) * | 1987-03-27 | 1988-10-05 | Hitachi Ltd | 半導体集積回路装置 |
JPH05259830A (ja) * | 1992-03-16 | 1993-10-08 | Yokogawa Electric Corp | ラッチ回路 |
JPH0918312A (ja) * | 1995-06-30 | 1997-01-17 | Nec Corp | 半導体集積回路 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5916421A (ja) * | 1982-07-19 | 1984-01-27 | Nec Corp | スイッチング回路 |
KR890016669A (ko) * | 1988-04-02 | 1989-11-29 | 미다 가쓰시게 | 반도체 집적회로 |
JP2747467B2 (ja) | 1991-08-19 | 1998-05-06 | 日本電信電話株式会社 | スタティック型フリップフロップ回路 |
US6538486B1 (en) * | 2000-10-11 | 2003-03-25 | Lucent Technologies Inc. | Latch chain having improved sensitivity |
US7135894B1 (en) * | 2002-09-13 | 2006-11-14 | National Semiconductor Corporation | Dual-output current driver |
-
2005
- 2005-10-04 JP JP2006539294A patent/JP4683234B2/ja not_active Expired - Fee Related
- 2005-10-04 US US11/576,682 patent/US7671652B2/en not_active Expired - Fee Related
- 2005-10-04 WO PCT/JP2005/018342 patent/WO2006038612A1/ja active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS631212A (ja) * | 1986-06-20 | 1988-01-06 | Fujitsu Ltd | Ecl回路 |
JPS63240117A (ja) * | 1987-03-27 | 1988-10-05 | Hitachi Ltd | 半導体集積回路装置 |
JPH05259830A (ja) * | 1992-03-16 | 1993-10-08 | Yokogawa Electric Corp | ラッチ回路 |
JPH0918312A (ja) * | 1995-06-30 | 1997-01-17 | Nec Corp | 半導体集積回路 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008211615A (ja) * | 2007-02-27 | 2008-09-11 | Hitachi Ltd | 論理回路 |
JP2011155452A (ja) * | 2010-01-27 | 2011-08-11 | Renesas Electronics Corp | 差動論理回路、分周回路、及び周波数シンセサイザ |
Also Published As
Publication number | Publication date |
---|---|
JP4683234B2 (ja) | 2011-05-18 |
US20080030234A1 (en) | 2008-02-07 |
JPWO2006038612A1 (ja) | 2008-08-07 |
US7671652B2 (en) | 2010-03-02 |
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