A static current control circuit and operational amplifier

Abstract

This invention provides a static current control circuit and an operational amplifier. The control circuit includes a static control feedback module. The static control feedback module is connected to a current source drive module and a current sink drive module. When the current source drive voltage is less than a first reference voltage, the current sink drive current output to the current sink drive module is increased. The current sink drive module decreases the output target voltage according to the current sink drive current and feeds the target voltage back to the input stage module. The input stage module decreases the output gain drive current to the gain module according to the decreased input target voltage. The gain module increases the input current source drive current to the current source drive module according to the decreased drive current. The current source drive module increases the static current of the drive stage according to the increased current source drive current, thereby keeping the static current of the drive stage balanced.

Description

Technical Field

[0001] This invention relates to the field of integrated circuit technology, and in particular to a static current control circuit and an operational amplifier. Background Technology

[0002] Operational amplifiers are widely used in integrated circuits, and quiescent current is a crucial parameter for power operational amplifiers. The quiescent current is the total current of an operational amplifier when it is unloaded, with stable DC input and output voltages, and both input and output voltages are within their operating range. The quiescent current of a power operational amplifier equals the sum of the driver stage quiescent current and the quiescent currents of other components, with the driver stage quiescent current accounting for the majority of the total quiescent current. Therefore, the magnitude of the total quiescent current of an operational amplifier is primarily determined by the driver stage quiescent current, and the total quiescent current is controlled by controlling the driver stage quiescent current.

[0003] In existing technologies, the quiescent current of the drive stage is usually controlled by adjusting the resistance value in the operational amplifier. However, this method is affected by the absolute parameters of the operational amplifier, such as the amplification factor of the transistor, the base-emitter voltage of the transistor, and the resistance value. Since there is a certain error between the absolute parameters and the actual values, the quiescent current of the operational amplifier cannot be accurately adjusted. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a static current control circuit and operational amplifier, which solves the problem that the static current of operational amplifiers cannot be precisely adjusted in existing technologies.

[0005] In a first aspect, the present invention provides a static current control circuit applied to an operational amplifier, the operational amplifier comprising: an input stage module, a gain module, a current source drive module, and a current sink drive module, characterized in that the control circuit comprises: a static control feedback module; the static control feedback module is connected to the current source drive module and the current sink drive module respectively, and is further configured to increase the output current sink drive current to the current sink drive module when the current source drive voltage of the current source drive module is less than a first reference voltage; the output terminal of the current sink drive module is connected to the input stage module, and is configured to decrease the output target voltage according to the current sink drive current, and is further configured to feed the target voltage back to the input stage module; the input stage module is connected to the gain module, and is configured to decrease the output gain drive current to the gain module according to the decreased target voltage; the gain module is connected to the current source drive module respectively, and is configured to increase the input current source drive current to the current source drive module according to the decreased gain drive current; the current source drive module is further configured to increase the static current of the drive stage according to the increased current source drive current.

[0006] Optionally, the static control feedback module includes a second amplifier; the non-inverting input of the second amplifier is used to input a first reference voltage; the inverting input of the second amplifier is connected to the current source drive module, and the output of the second amplifier is connected to the current sink drive module.

[0007] Optionally, the control circuit further includes: a first reference source module, which is connected to the static control feedback module and is used to provide a first reference voltage to the static control feedback module; the first reference source module includes: a third current source, a tenth N-type transistor, a sixth resistor, and a fourth current source; the first terminal of the third current source is connected to the first terminal of an external power supply, and the second terminal of the third current source is connected to the collector of the tenth N-type transistor; the base of the tenth N-type transistor is connected to the first terminal of the fourth current source and the non-inverting input terminal of the second amplifier through the sixth resistor, the collector of the tenth N-type transistor is connected to the base, and the emitter of the tenth N-type transistor is connected to the current sink drive module through a seventh resistor; the second terminal of the fourth current source is connected to the second terminal of the external power supply; and the inverting input terminal of the second amplifier is connected to the base of the third N-type transistor.

[0008] Optionally, the control circuit further includes: a first reference source module, which is connected to the static control feedback module and is used to provide a first reference voltage to the static control feedback module; the first reference source module includes: a third current source, a tenth N-type transistor, an eleventh N-type transistor, a sixth resistor, a seventh resistor, and a fourth current source; the first terminal of the third current source is connected to the first terminal of an external power supply, and the second terminal of the third current source is connected to the collector of the tenth N-type transistor; the base of the tenth N-type transistor is connected to the first terminal of the fourth current source and the non-inverting input terminal of the second amplifier through the sixth resistor; the collector of the tenth N-type transistor is connected to the base, and the emitter of the tenth N-type transistor is connected to the collector of the eleventh N-type transistor; the base of the eleventh N-type transistor is connected to the collector, and the emitter of the tenth N-type transistor is connected to the current sink drive module through the seventh resistor; the second terminal of the fourth current source is connected to the second terminal of the external power supply; and the inverting input terminal of the second amplifier is connected to the base of the second N-type transistor.

[0009] Optionally, the second operational amplifier includes: an eighteenth N-type transistor, a nineteenth N-type transistor, a twentieth N-type transistor, a twenty-first N-type transistor, a twenty-second N-type transistor, a fourth P-type transistor, a fifth P-type transistor, an eighteenth P-type transistor, and a nineteenth P-type transistor; the base of the eighteenth N-type transistor is used to receive a reference current, and the collector of the eighteenth N-type transistor is connected to the emitter of the nineteenth N-type transistor and the emitter of the twentieth N-type transistor, respectively. The second terminal of the transistor is connected to an external power supply; the base of the nineteenth N-type transistor is connected to the first reference source module, and the collector of the nineteenth N-type transistor is connected to the collector of the fifth P-type transistor and the emitter of the nineteenth P-type transistor, respectively; the base of the twentieth N-type transistor is connected to the current sink drive module, and the collector of the twentieth N-type transistor is connected to the collector of the fourth P-type transistor and the emitter of the eighteenth P-type transistor, respectively; the base of the fourth P-type transistor is connected to the second P-type transistor... The base of the fourth P-type transistor is connected to the base of the fifth P-type transistor; the emitter of the fourth P-type transistor is connected to the second terminal of the external power supply; and the collector of the fourth P-type transistor is connected to the eighteenth P-type transistor. The emitter of the fifth P-type transistor is connected to the first terminal of the external power supply; and the collector of the fifth P-type transistor is connected to the emitter of the nineteenth P-type transistor. The base of the eighteenth P-type transistor is used to input the second bias voltage; and the collector of the eighteenth P-type transistor is connected to the collector of the twenty-first N-type transistor. The base of the nineteenth P-type transistor is connected to the base of the eighteenth P-type transistor, and the collector of the nineteenth P-type transistor is connected to the collector of the twelfth N-type transistor and the current sink drive module, respectively; the base of the twelfth N-type transistor is connected to the base of the twelfth N-type transistor, the collector of the twelfth N-type transistor is connected to the base, and the emitter of the twelfth N-type transistor is connected to the second terminal of the external power supply; the emitter of the twelfth N-type transistor is connected to the second terminal of the external power supply.

[0010] Optionally, the control circuit further includes: a first reference source module, which is connected to the static control feedback module and is used to provide a first reference voltage and a reference current to the static control feedback module; the first reference source module includes: a seventh current source, a fourteenth N-type transistor, a fifteenth N-type transistor, a second P-type transistor, a tenth N-type transistor, and a seventeenth N-type transistor; the first terminal of the seventh current source is connected to the first terminal of an external power supply, and the second terminal of the seventh current source is connected to the collector of the fourteenth N-type transistor; the base of the fourteenth N-type transistor is connected to the base of the fifteenth N-type transistor, the collector of the fourteenth N-type transistor is connected to the base, and the emitter of the fourteenth N-type transistor is connected to the second terminal of the external power supply; the collector of the fifteenth N-type transistor... The base of the 17th N-type transistor is connected to the base of the 15th N-type transistor, and the collector of the 17th N-type transistor is connected to the emitter of the 10th N-type transistor and the base of the 19th N-type transistor. The emitter of the 17th N-type transistor is connected to the second terminal of the external power supply. The base and collector of the 10th N-type transistor are connected, and the collector of the 10th N-type transistor is connected to the current source drive module. The base of the second P-type transistor is connected to the base of the fourth P-type transistor and the base of the fifth P-type transistor. The collector of the second P-type transistor is connected to the first terminal of the external power supply, and the collector and base of the second P-type transistor are connected.

[0011] Optionally, the control circuit further includes: a first reference source module, which is connected to the static control feedback module and is used to provide a first reference voltage and a reference current to the static control feedback module; the first reference source module includes: a seventh current source, a fourteenth N-type transistor, a fifteenth N-type transistor, a second P-type transistor, a seventeenth N-type transistor, a sixth resistor, a twentieth P-type transistor, a tenth P-type transistor, and an eleventh P-type transistor; the first terminal of the seventh current source is connected to the first terminal of an external power supply, and the second terminal of the seventh current source is connected to the collector of the fourteenth N-type transistor; the base of the fourteenth N-type transistor is connected to the base of the fifteenth N-type transistor, the collector of the fourteenth N-type transistor is connected to the base, and the emitter of the fourteenth N-type transistor is connected to the second terminal of an external power supply; the collector of the fifteenth N-type transistor is connected to the collector of the second P-type transistor, and the emitter of the fifteenth N-type transistor is connected to the second terminal of an external power supply. The second terminal of the external power supply is connected; the base of the seventeenth N-type transistor is connected to the base of the fifteenth N-type transistor, the collector of the seventeenth N-type transistor is connected to the first terminal of the sixth resistor and the base of the nineteenth N-type transistor, and the emitter of the seventeenth N-type transistor is connected to the second terminal of the external power supply; the base of the tenth N-type transistor is connected to the collector and the second terminal of the sixth resistor, the collector of the tenth N-type transistor is connected to the collector of the twentieth P-type transistor, and the emitter of the tenth N-type transistor is connected to the collector and base of the eleventh N-type transistor; the emitter of the eleventh N-type transistor is connected to the current source drive module; the base of the twentieth P-type transistor is connected to the base of the second P-type transistor, the collector of the twentieth P-type transistor is connected to the first terminal of the external power supply; the base and collector of the second P-type transistor are connected, and the emitter of the second P-type transistor is connected to the first terminal of the external power supply.

[0012] In a second aspect, the present invention provides an operational amplifier, the operational amplifier further comprising: an input stage module, a gain module, a current source drive module, and a current sink drive module; the input stage module includes a first amplifier; the non-inverting input terminal of the first amplifier is connected to the output terminal of the current sink drive module, and the output terminal of the first amplifier is connected to the gain module; the current source drive module includes: a second N-type transistor, a third N-type transistor, a second resistor, and a third resistor; the current sink drive module includes: a fourth N-type transistor, a fifth N-type transistor, a fourth resistor, and a fifth resistor; the base of the second N-type transistor is connected to the first N-type transistor... The collector of the first N-type transistor is connected to the first terminal of the external power supply, and the emitter of the second N-type transistor is connected to the first terminal of the second resistor; the base of the second N-type transistor is also connected to the inverting input terminal of the second amplifier, or the emitter of the second N-type transistor is also connected to the inverting input terminal of the second amplifier; the base of the third N-type transistor is connected to the emitter of the second N-type transistor, the collector of the third N-type transistor is connected to the first terminal of the external power supply, and the emitter of the third N-type transistor is connected to the first terminal of the third resistor; the third The second terminal of the resistor is connected to the first terminal of the second resistor; the base of the fourth N-type transistor is connected to the output terminal of the second amplifier, the collector of the fourth N-type transistor is connected to the first terminal of the external power supply, and the emitter of the fourth N-type transistor is connected to the first terminal of the fourth resistor; the second terminal of the fourth resistor is connected to the second terminal of the external power supply; the base of the fifth N-type transistor is connected to the emitter of the fourth N-type transistor, the collector of the fifth N-type transistor is connected to the second terminal of the second resistor, and the collector of the fifth N-type transistor is also connected to the input stage module. The emitter of the transistor is connected to the first terminal of the fifth resistor; the second terminal of the fifth resistor is also connected to the second terminal of the fourth resistor; the gain module includes: a first N-type transistor, a first current source, and a second current source; the base of the first N-type transistor is connected to the output terminal of the input stage module, and the collector of the first N-type transistor is connected to the second terminal of the second current source and the current source driving module, respectively; the emitter of the first N-type transistor is connected to the first terminal of the first current source; the first terminal of the second current source is connected to the first terminal of an external power supply; the second terminal of the first current source is connected to the second terminal of an external power supply.

[0013] Optionally, the operational amplifier further includes: a first limit control module and a second limit control module; the first limit control module is connected to the current source drive module and is used to shunt the current source drive current of the current source drive module when the current source output voltage of the current source drive module is less than the second reference voltage; the current source drive module is used to reduce the output first limit current according to the reduced current source drive current; the second limit control module is connected to the current sink drive module and is used to shunt the current sink drive current of the current sink drive module when the current sink output voltage of the current sink drive module is greater than the third reference voltage; the current sink drive module is used to reduce the output second limit current according to the reduced current source drive current.

[0014] Thirdly, the present invention provides an operational amplifier, which further includes: an input stage module, a gain module, a current source drive module, and a current sink drive module; the input stage module includes a first amplifier; the non-inverting input terminal of the first amplifier is connected to the output terminal of the current sink drive module, and the output terminal of the first amplifier is connected to the gain module; the current source drive module includes: a second N-type transistor, a third N-type transistor, a second resistor, and a third resistor; the current sink drive module includes: a fourth N-type transistor, a fifth N-type transistor, a fourth resistor, and a fifth resistor; the base of the second N-type transistor is connected to the collector of the first N-type transistor, and the collector of the second N-type transistor is connected to a first terminal of an external power supply. The emitter of the second N-type transistor is connected to the first terminal of the second resistor; the base of the second N-type transistor is also connected to the inverting input terminal of the second amplifier, or the emitter of the second N-type transistor is also connected to the inverting input terminal of the second amplifier; the base of the third N-type transistor is connected to the emitter of the second N-type transistor, the collector of the third N-type transistor is connected to the first terminal of the external power supply, and the emitter of the third N-type transistor is connected to the first terminal of the third resistor; the second terminal of the third resistor is connected to the first terminal of the second resistor; the base of the fourth N-type transistor is connected to the output terminal of the second amplifier, and the collector of the fourth N-type transistor is connected to the first terminal of the external power supply. The emitter of the fourth N-type transistor is connected to the first terminal of the fourth resistor; the second terminal of the fourth resistor is connected to the second terminal of the external power supply; the base of the fifth N-type transistor is connected to the emitter of the fourth N-type transistor, the collector of the fifth N-type transistor is connected to the second terminal of the second resistor, the collector of the fifth N-type transistor is also connected to the input stage module, the emitter of the fifth N-type transistor is connected to the first terminal of the fifth resistor, and the second terminal of the fifth resistor is also connected to the second terminal of the fourth resistor; the gain module includes: a first N-type transistor, a third P-type transistor, a ninth N-type transistor, and a sixteenth N-type transistor; the base of the first N-type transistor is connected to the output terminal of the first amplifier. The collector of the first N-type transistor is connected to the collector of the third P-type transistor, and the emitter of the first N-type transistor is connected to the collector of the sixteenth N-type transistor. The base of the sixteenth N-type transistor is connected to the base of the fifteenth N-type transistor, and the emitter of the sixteenth N-type transistor is connected to the second terminal of an external power supply. The base of the ninth N-type transistor is used to input a first reference voltage, the collector of the ninth N-type transistor is connected to the first terminal of an external power supply, and the emitter of the ninth N-type transistor is connected to the emitter of the first N-type transistor. The base of the third P-type transistor is connected to the base of the second P-type transistor, and the emitter of the third P-type transistor is connected to the first terminal of an external power supply.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The static control feedback module is connected to both the current source drive module and the current sink drive module. When the current source drive voltage is less than the first reference voltage, the current sink drive current output to the current sink drive module is increased. The current sink drive module decreases the output target voltage based on the current sink drive current and feeds the target voltage back to the input stage module. The input stage module decreases the output gain drive current to the gain module based on the decreased input target voltage. The gain module increases the input current source drive current to the current source drive module based on the decreased drive current. The current source drive module increases the static current of the drive stage based on the increased current source drive current, thereby keeping the static current of the drive stage balanced. This avoids the influence of the absolute parameters of the operational amplifier on the control of the static current of the drive stage achieved by adjusting the resistance value in the operational amplifier in the prior art, and achieves precise control of the static current of the drive stage. Attached Figure Description

[0017] Figure 1 This is a structural diagram of a static current control circuit provided in an embodiment of the present invention;

[0018] Figure 2 A circuit diagram of a first static current control circuit provided in an embodiment of the present invention;

[0019] Figure 3 A circuit diagram of a second static current control circuit provided in an embodiment of the present invention;

[0020] Figure 4 A circuit diagram of a third static current control circuit provided in an embodiment of the present invention;

[0021] Figure 5 A circuit diagram of a fourth static current control circuit provided in an embodiment of the present invention;

[0022] Figure 6 A circuit diagram of the fifth static current control circuit provided in this embodiment of the invention; Detailed Implementation

[0023] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Explanation of symbols used in all formulas of this invention:

[0025] NX represents an NPN transistor; PX represents a PNP transistor.

[0026] This indicates the current amplification factor of an NPN transistor; This represents the current amplification factor of a PNP transistor.

[0027] IX indicates a current source, and the numbers following it indicate the resistor's serial number; I X This indicates the current value of the current source with the same serial number, and the number following it indicates the serial number of the current source.

[0028] RX represents resistance, and the numbers following it indicate the resistor's serial number; R X This indicates the resistance value of the resistor with the same serial number, and the number following it indicates the serial number of the resistor.

[0029] I PXX This indicates the current at a certain port of a PNP device, where I represents the current symbol, P represents the symbol of a PNP bipolar transistor in the subscript PXX, the first X represents the device number, which is Arabic numerals such as 1, 2, 3, etc.; the second X represents the port of the device, which is C (collector), B (base) and E (emitter).

[0030] I NXX This indicates the current at a certain port of an NPN device, where I represents the current symbol, NXX represents the NPN bipolar transistor symbol, the first X represents the device number (e.g., 1, 2, 3, etc.), and the second X represents the port of the device (C (collector), B (base), and E (emitter).

[0031] V PXX This indicates the voltage at a certain port of a PNP device, where V represents the voltage symbol, P represents the symbol for a PNP bipolar transistor in the subscript PXX, the first X represents the device number, which is Arabic numerals such as 1, 2, 3, etc.; the second X represents the port of the device, which is C (collector), B (base) and E (emitter).

[0032] V NXX This indicates the voltage at a certain port of an NPN device, where V represents the voltage symbol, NXX represents the NPN bipolar transistor symbol, the first X represents the device number (e.g., 1, 2, 3, etc.), and the second X represents the port of the device (C (collector), B (base), and E (emitter).

[0033] V BEPX This indicates the BE junction voltage of a PNP device, where V represents the voltage symbol, the subscript BEPXX indicates BE junction, P indicates PNP bipolar transistor symbol, and X indicates the device number, which is an Arabic numeral such as 1, 2, 3, etc.

[0034] V BENXThis indicates the BE junction voltage of a certain NPN device, where V represents the voltage symbol, the subscript BENXX indicates BE junction, N represents the NPN bipolar transistor symbol, and X represents the device number, which is an Arabic numeral such as 1, 2, 3, etc.

[0035] I SPX This indicates the saturation current of a PNP device, where I represents the current symbol, S in the subscript SPX indicates saturation, P represents the symbol for a PNP bipolar transistor, and X represents the device number, which is an Arabic numeral such as 1, 2, 3, etc.

[0036] I SNX This represents the saturation current of a certain NPN device, where I represents the current symbol, the subscript SNX indicates saturation, N represents the NPN bipolar transistor symbol, and X represents the device number, which is an Arabic numeral such as 1, 2, 3, etc.

[0037] K XXXX This represents the ratio of the emitter areas of two bipolar transistor devices. The first and third X's indicate the device type, which is either P or N; the second and fourth X's indicate the device number, which is Arabic numerals such as 1, 2, 3, etc.

[0038] V RX This represents the voltage across a resistor, where V represents the voltage symbol, R represents the resistance symbol, and X represents the component number, which is an Arabic numeral such as 1, 2, 3, etc.

[0039] I RX This represents the current flowing through a certain resistive element, where I represents the current symbol, R represents the resistance symbol, and X represents the element number, which is an Arabic numeral such as 1, 2, 3, etc.

[0040] K RXRX This indicates the ratio of the resistance values ​​of two resistors. The two R's in the subscript represent the resistor symbol, and the two X's represent the component number, which is Arabic numerals such as 1, 2, 3, etc.

[0041] Figure 1 A structural diagram of a static current control circuit provided in an embodiment of the present invention is shown below. Figure 1 As shown, the static current control circuit is applied to an operational amplifier, which includes: an input stage module 100, a gain module 200, a current source drive module 400, and a current sink drive module 500; the control circuit includes: a static control feedback module 300.

[0042] The static control feedback module 300 is connected to the current source drive module 400 and the current sink drive module 500 respectively, and is also used to increase the output current sink drive current to the current sink drive module 500 when the current source drive voltage of the current source drive module 400 is less than the first reference voltage.

[0043] The output terminal of the current sinking drive module 500 is connected to the input stage module 100, and is used to reduce the output target voltage according to the current sinking drive current, and also to feed the target voltage back to the input stage module 100.

[0044] The input stage module 100 is connected to the gain module 200 and is used to reduce the output gain drive current to the gain module 200 according to the reduced target voltage.

[0045] The gain module 200 is connected to the current source drive module 400 and is used to increase the input current source drive current to the current source drive module 400 according to the decrease in gain drive current.

[0046] The current source drive module 400 is further configured to increase the static current of the drive stage according to the increased current source drive current, and to increase the current source drive voltage to the first reference source voltage according to the increased current source drive current.

[0047] In this embodiment, the static control feedback module 300 collects the current source drive voltage of the current source drive module 400. When the current source drive voltage is less than the first reference voltage, the current source drive voltage is increased and output to the current sink drive module 500. The current sink drive module 500 outputs a target voltage based on the smaller current sink drive voltage and feeds the target voltage back to the input stage module 100. The input stage module 100 outputs a gain drive current to the gain module 200 based on the reduced target voltage. The gain module 200 increases the current source drive current input to the current source drive module 400 based on the reduced gain drive current. The current source drive module 400 increases the drive stage static current based on the increased current source drive current, and increases the current source drive voltage to the first reference voltage based on the increased current source drive current, thereby keeping the drive stage static current balanced.

[0048] Figure 2 A circuit diagram of a static current control circuit provided in an embodiment of the present invention is shown below. Figure 2 As shown, the input stage module 100 includes a first amplifier A1; the non-inverting input terminal of the first amplifier A1 is connected to the output terminal of the current sink drive module 500, and the output terminal of the first amplifier A1 is connected to the gain module 200.

[0049] In this embodiment of the invention, when the inverting input terminal of the first amplifier A1 detects a decrease in the target voltage output by the current sinking drive module 500, the output terminal of the first amplifier A1 reduces the output gain drive current to the gain module 200.

[0050] like Figure 2 As shown, the gain module 200 includes: a first N-type transistor N1, a first current source I1, and a second current source I2; the base of the first N-type transistor N1 is connected to the output terminal of the input stage module 100, and the collector of the first N-type transistor N1 is connected to the second terminal of the second current source I2 and the current source driving module 400, respectively; the emitter of the first N-type transistor N1 is connected to the first terminal of the first current source I1; the first terminal of the second current source I2 is connected to the first terminal of an external power supply; and the second terminal of the first current source I1 is connected to the second terminal of an external power supply.

[0051] The static control feedback module 300 includes a second amplifier A2; the non-inverting input of the second amplifier A2 is used to input the first reference source voltage; the inverting input of the second amplifier A2 is connected to the current source drive module 400, and the output of the second amplifier A2 is connected to the current source drive module 500. It should be noted that the dashed lines in the figure represent two connection methods between the second amplifier A2 and the current source drive module 400. In actual use, the two dashed lines cannot be connected simultaneously; only one dashed line should be selected for connection each time.

[0052] The current source drive module 400 includes: a second N-type transistor N2, a third N-type transistor N3, a second resistor R2, and a third resistor R3; the base of the second N-type transistor N2 is connected to the collector of the first N-type transistor N1, the collector of the second N-type transistor N2 is connected to the first terminal of an external power supply, and the emitter of the second N-type transistor N2 is connected to the first terminal of the second resistor R2; the base of the second N-type transistor N2 is also connected to the inverting input terminal of the second amplifier A2, or the emitter of the second N-type transistor N2 is also connected to the inverting input terminal of the second amplifier A2; the base of the third N-type transistor N3 is connected to the emitter of the second N-type transistor N2, the collector of the third N-type transistor N3 is connected to the first terminal of the external power supply, and the emitter of the third N-type transistor N3 is connected to the first terminal of the third resistor R3; the second terminal of the third resistor R3 is connected to the first terminal of the second resistor R2.

[0053] It should be noted that the third N-type transistor N3 is a current source drive transistor, the second N-type transistor N2 and the third N-type transistor N3 form a Darlington structure, and the third resistor R3 is the degradation resistor of the third N-type transistor N3, which generally has a very small resistance value.

[0054] The current sinking drive module 500 includes: a fourth N-type transistor N4, a fifth N-type transistor N5, a fourth resistor R4, and a fifth resistor R5; the base of the fourth N-type transistor N4 is connected to the output terminal of the second amplifier A2, the collector of the fourth N-type transistor N4 is connected to the first terminal of an external power supply, and the emitter of the fourth N-type transistor N4 is connected to the first terminal of the fourth resistor R4; the second terminal of the fourth resistor R4 is connected to the second terminal of the external power supply; the base of the fifth N-type transistor N5 is connected to the emitter of the fourth N-type transistor N4, the collector of the fifth N-type transistor N5 is connected to the second terminal of the second resistor R2, the collector of the fifth N-type transistor N5 is also connected to the input stage module 100, the emitter of the fifth N-type transistor N5 is connected to the first terminal of the fifth resistor R5; the second terminal of the fifth resistor R5 is also connected to the second terminal of the fourth resistor R4.

[0055] It should be noted that the fourth N-type transistor N4 and the fifth N-type transistor N5 form a Darlington structure, and the fifth resistor R5 is the degradation resistor of the fifth N-type transistor N5, which generally has a very small resistance value.

[0056] When the static control feedback module 300 detects that the current source drive voltage of the current source drive module 400 is less than the first reference voltage, it increases the current sink drive current output to the current sink drive module 500, that is, the base current of the fourth N-type transistor N4 increases, thereby increasing the target voltage V output by the current sink drive module 500. OUT When the voltage at the non-inverting input of the first amplifier A1 increases, the output current of the first amplifier A1 decreases, and the current received at the base of the first N-type transistor N1 decreases. This decreases the collector current of the first N-type transistor N1, thus increasing the current input to the base of the second N-type transistor N2. The emitter current of the third N-type transistor N3 also increases, resulting in an increase in the drive stage current, thereby maintaining the balance of the current.

[0057] Figure 3 A circuit diagram of the second static current control circuit provided in the embodiments of the present invention is shown below. Figure 3As shown, the control circuit further includes: a first reference source module, which is connected to the static control feedback module 300 and is used to provide a first reference voltage to the static control feedback module 300; the first reference source module includes: a third current source I3, a tenth N-type transistor N10, an eleventh N-type transistor N11, a sixth resistor R6, a seventh resistor R7, and a fourth current source I4; the first terminal of the third current source I3 is connected to the first terminal of an external power supply, and the second terminal of the third current source I3 is connected to the collector of the tenth N-type transistor N10; the base of the tenth N-type transistor N10 is connected to the sixth resistor R6. 6 is connected to the first terminal of the fourth current source I4 and the non-inverting input terminal of the second amplifier A2 respectively. The collector and base of the tenth N-type transistor N10 are connected, and the emitter of the tenth N-type transistor N10 is connected to the collector of the eleventh N-type transistor N11. The base and collector of the eleventh N-type transistor N11 are connected, and the emitter of the tenth N-type transistor N10 is connected to the current sink drive module 500 through the seventh resistor R7. The second terminal of the fourth current source I4 is connected to the second terminal of the external power supply. The inverting input terminal of the second amplifier A2 is connected to the base of the second N-type transistor N2.

[0058] In this embodiment, the third current source I3, the fourth current source I4, the tenth N-type transistor N10, the eleventh N-type transistor N11, the sixth resistor R6, and the seventh resistor R7 constitute a dynamic reference source, and the dynamic reference voltage equation is:

[0059]

[0060] in, , Therefore:

[0061]

[0062] Due to the virtual short-circuit characteristic of the second amplifier A2A2, the voltages at its two input terminals are equal, therefore:

[0063]

[0064] Therefore, the quiescent current of the drive stage is:

[0065]

[0066] Among them, the second N-type transistor N2, the third N-type transistor N3, the tenth N-type transistor N10, and the eleventh N-type transistor N11 are similar devices, and their base-emitter voltages can be considered to be close. Therefore:

[0067]

[0068] In the design, the third resistor R3, the sixth resistor R6, and the seventh resistor R7 are all of the same type. Therefore, the final static current value of the drive stage is entirely determined by the ratio of the resistance values ​​of the third current source I3, the fourth current source I4, the sixth resistor R6, and the third resistor R3. And the ratio of the resistance of the seventh resistor R7 to the resistance of the third resistor R3 This allows for precise control of the quiescent current of the drive stage.

[0069] It should be noted that during the design process, if the current and emitter area of ​​the third N-type transistor N3 and the tenth N-type transistor N10 are not proportional due to device structure and layout, the static current of the drive stage can be set to a reasonable value by appropriately adjusting the resistance values ​​of the sixth resistor R6 and the seventh resistor R7.

[0070] Figure 4 The circuit diagram of the third static current control circuit provided in the embodiments of the present invention is as follows: Figure 4 As shown, the control circuit further includes: a first reference source module, which is connected to the static control feedback module 300 and is used to provide a first reference voltage to the static control feedback module 300; the first reference source module includes: a third current source I3, a tenth-type N transistor N10, a sixth resistor R6, and a fourth current source I4; the first terminal of the third current source I3 is connected to the first terminal of an external power supply, and the second terminal of the third current source I3 is connected to the collector of the tenth-type N transistor N10; the base of the tenth-type N transistor N10 is connected to the first terminal of the fourth current source I4 and the non-inverting input terminal of the second amplifier A2 through the sixth resistor R6, the collector of the tenth-type N transistor N10 is connected to the base, and the emitter of the tenth-type N transistor N10 is connected to the current sink drive module 500 through the seventh resistor R7; the second terminal of the fourth current source I4 is connected to the second terminal of an external power supply; the inverting input terminal of the second amplifier A2 is connected to the base of the third N transistor N3.

[0071] In this embodiment, the third current source I3, the fourth current source I4, the tenth N-type transistor N10, the sixth resistor R6, and the seventh resistor R7 constitute a dynamic reference source circuit, and the dynamic reference voltage equation is:

[0072]

[0073] in, , Therefore:

[0074]

[0075] Due to the virtual short-circuit characteristic of the second amplifier A2, the voltages at its two input terminals are equal.

[0076]

[0077] Since the third N-type transistor N3 and the tenth N-type transistor N10 are similar devices, their base-emitter voltages can be considered to be close. Therefore:

[0078]

[0079] If the sixth resistor R6 and the seventh resistor R7 are of the same type, then the final static current value of the drive stage is entirely determined by the ratio of the resistance values ​​of the third current source I3 and the fourth current source I4, and the resistance value of the sixth resistor R6 to the resistance value of the third resistor R3. And the ratio of the resistance of the seventh resistor R7 to the resistance of the third resistor R3 This allows for precise control of the quiescent current of the drive stage.

[0080] It should be noted that during the design process, if the current and emitter area of ​​the third N-type transistor N3 and the tenth N-type transistor N10 are not proportional due to device structure and layout, the static current of the drive stage can be set to a reasonable value by appropriately adjusting the resistance values ​​of the sixth resistor R6 and the seventh resistor R7.

[0081] In this embodiment of the invention, the operational amplifier further includes: a first limit control module 600 and a second limit control module 700;

[0082] The first limit control module 600 is connected to the current source drive module 400 and is used to shunt the current source drive current of the current source drive module 400 when the current source output voltage of the current source drive module 400 is less than the second reference voltage.

[0083] The current source drive module 400 is used to reduce the output first limit current according to the reduced current source drive current;

[0084] The second limit control module 700 is connected to the current sinking drive module 500 and is used to shunt the current sinking drive current of the current sinking drive module 500 when the current sinking output voltage of the current sinking drive module 500 is greater than the third reference voltage.

[0085] The current sinking drive module 500 is used to reduce the output second limit current according to the reduced current source drive current.

[0086] In this embodiment, the first limit control module 600 compares the acquired current source output voltage with the second reference voltage. When the current source output voltage is less than the second reference voltage, the current source drive current of the current source drive module 400 is shunted. The current source drive module 400 reduces the output first current according to the reduced current source drive current, thereby achieving precise control of the first limit current. The second limit control module 700 compares the current sink output voltage of the current sink drive module 500 with the third reference voltage. When the current sink output voltage is greater than the third reference voltage, the current sink drive module 500 is shunted. The current sink drive module 500 reduces the output second limit current according to the reduced current source drive current, thereby achieving precise control of the second limit current.

[0087] Figure 5 The circuit diagram of the fourth static current control circuit provided in the embodiments of the present invention is as follows: Figure 5As shown, the second operational amplifier includes: an eighteenth N-type transistor N18, a nineteenth N-type transistor N19, a twentieth N-type transistor N20, a twenty-first N-type transistor N21, a twenty-second N-type transistor N22, a fourth P-type transistor P4, a fifth P-type transistor P5, an eighteenth P-type transistor P18, and a nineteenth P-type transistor P19; the base of the eighteenth N-type transistor N18 is used to receive a reference current, and the collector of the eighteenth N-type transistor N18 is connected to the emitter of the nineteenth N-type transistor N19 and the emitter of the twenty-second N-type transistor N20, respectively. The emitter of the nineteenth N-type transistor N18 is connected to the second terminal of the external power supply; the base of the nineteenth N-type transistor N19 is connected to the first reference source module, and the collector of the nineteenth N-type transistor N19 is connected to the collector of the fifth P-type transistor P5 and the emitter of the nineteenth P-type transistor P19, respectively; the base of the twentieth N-type transistor N20 is connected to the current sink drive module, and the collector of the twentieth N-type transistor N20 is connected to the collector of the fourth P-type transistor P4 and the emitter of the eighteenth P-type transistor P18, respectively; the base of the fourth P-type transistor P4 is connected to the... The base of the second P-type transistor P2 is connected to the base of the fifth P-type transistor P5; the emitter of the fourth P-type transistor P4 is connected to the second terminal of an external power supply; and the collector of the fourth P-type transistor P4 is connected to the eighteenth P-type transistor P18. The emitter of the fifth P-type transistor P5 is connected to the first terminal of an external power supply; and the collector of the fifth P-type transistor P5 is connected to the emitter of the nineteenth P-type transistor P19. The base of the eighteenth P-type transistor P18 is used to input a second bias voltage, and the collector of the eighteenth P-type transistor P18 is connected to the collector of the twenty-first N-type transistor N21. The electrodes are connected; the base of the nineteenth P-type transistor P19 is connected to the base of the eighteenth P-type transistor P18, and the collector of the nineteenth P-type transistor P19 is connected to the collector of the twenty-second N-type transistor N22 and the current sink drive module, respectively; the base of the twenty-first N-type transistor N21 is connected to the base of the twenty-second N-type transistor N22, the collector of the twenty-first N-type transistor N21 is connected to the base, and the emitter of the twenty-first N-type transistor is connected to the second terminal of the external power supply; the emitter of the twenty-second N-type transistor N22 is connected to the second terminal of the external power supply.

[0088] The control circuit further includes: a first reference source module, which is connected to the static control feedback module and is used to provide a first reference voltage and a reference current to the static control feedback module; the first reference source module includes: a seventh current source I7, a fourteenth N-type transistor N14, a fifteenth N-type transistor N15, a second P-type transistor P2, a tenth N-type transistor N10, and a seventeenth N-type transistor N17; the first terminal of the seventh current source I7 is connected to the first terminal of an external power supply, and the second terminal of the seventh current source I7 is connected to the collector of the fourteenth N-type transistor N14; the base of the fourteenth N-type transistor N14 is connected to the base of the fifteenth N-type transistor N15, the collector of the fourteenth N-type transistor N14 is connected to the base, and the emitter of the fourteenth N-type transistor N14 is connected to the second terminal of an external power supply; the collector of the fifteenth N-type transistor N15 is connected to the base of the external power supply. The collector of the second P-type transistor P2 is connected to the collector of the fifteenth N-type transistor N15, and the emitter of the fifteenth N-type transistor N15 is connected to the second terminal of an external power supply. The base of the seventeenth N-type transistor N17 is connected to the base of the fifteenth N-type transistor N15, and the collector of the seventeenth N-type transistor N17 is connected to the emitter of the tenth N-type transistor N10 and the base of the nineteenth N-type transistor N19, respectively. The emitter of the seventeenth N-type transistor N17 is connected to the second terminal of an external power supply. The base and collector of the tenth N-type transistor N10 are connected, and the collector of the tenth N-type transistor N10 is connected to a current source drive module. The base of the second P-type transistor P2 is connected to the base of the fourth P-type transistor P4 and the base of the fifth P-type transistor P5, respectively. The collector of the second P-type transistor P2 is connected to the first terminal of an external power supply, and the collector and base of the second P-type transistor P2 are connected.

[0089] The gain module includes: a first N-type transistor N1, a third P-type transistor P3, a ninth N-type transistor N9, and a sixteenth N-type transistor N16; the base of the first N-type transistor N1 is connected to the output terminal of the first amplifier, the collector of the first N-type transistor N1 is connected to the collector of the third P-type transistor P3, and the emitter of the first N-type transistor N1 is connected to the collector of the sixteenth N-type transistor N16; the base of the sixteenth N-type transistor N16 is connected to the fifteenth N-type transistor N16. The base of the first N-type transistor N16 is connected to the base of the second N-type transistor N1, and the emitter of the sixth N-type transistor N16 is connected to the second terminal of the external power supply. The base of the ninth N-type transistor N9 is used to input the first reference voltage, the collector of the ninth N-type transistor N9 is connected to the first terminal of the external power supply, and the emitter of the ninth N-type transistor N9 is connected to the emitter of the first N-type transistor N1. The base of the third P-type transistor P3 is connected to the base of the second P-type transistor, and the emitter of the third P-type transistor P3 is connected to the first terminal of the external power supply.

[0090] This embodiment is applicable to power operational amplifiers with low output current capability and small emitter area of ​​driving transistors. Such operational amplifiers can be designed with parameters so that the quiescent current of the tenth N-type transistor N10 and the third N-type transistor N3 are proportional to the emitter area.

[0091] The first amplifier A1 is the input stage circuit;

[0092] The first N-type transistor N1 is the input transistor of the main operational amplifier gain stage. The first N-type transistor N1, the ninth N-type transistor N9, the sixteenth N-type transistor N16 and the third P-type transistor P3 constitute the gain stage.

[0093] The ninth N-type transistor N9 forms a shunt circuit;

[0094] V1 and V2 are bias voltages;

[0095] The seventh current source I7 is the reference current. The fourteenth N-type transistor N14, the fifteenth N-type transistor N15, and the second P-type transistor P2 are mirror circuits that mirror the reference current to other circuits proportionally.

[0096] The eighteenth N-type transistor N18, the nineteenth N-type transistor N19, the twentieth N-type transistor N20, the twenty-first N-type transistor N21, the twenty-second N-type transistor N22, the fourth P-type transistor P4, the fifth P-type transistor P5, the eighteenth P-type transistor P18, and the nineteenth P-type transistor P19 are static current controlled operational amplifiers;

[0097] The positive input terminal of the static current control op-amp is connected to the OUT port, and the voltage of the OUT port is used as the dynamic reference. The positive input terminal of the static current control op-amp is the base of the twentieth N-type transistor N20.

[0098] The tenth N-type transistor N10 forms a step-down circuit, and the seventeenth N-type transistor N17 provides it with bias current;

[0099] The base voltage of the third N-type transistor N3 is stepped down by the tenth N-type transistor N10 and then connected to the negative input terminal of the static current control operational amplifier, which is the base of the nineteenth N-type transistor N19.

[0100] Due to the virtual short characteristic of the quiescent current controlled operational amplifier,

[0101]

[0102] again

[0103]

[0104] If the voltage drop across the degradation resistor is ignored, then

[0105]

[0106] If both the second N-type transistor N2 and the third N-type transistor N3 operate in the amplification region, then the quiescent current of the driver stage is mainly determined by the collector current of the third N-type transistor N3. Therefore, the quiescent current of the driver stage is...

[0107]

[0108] because As the reference current, , All of these are proportional constants, thus achieving the goal of precisely controlling the static current of the drive stage.

[0109] In another embodiment of the invention, Figure 6 The circuit diagram of the fifth static current control circuit provided in the embodiments of the present invention is as follows: Figure 6As shown, the control circuit further includes: a first reference source module, which is connected to the static control feedback module and is used to provide a first reference voltage and a reference current to the static control feedback module; the first reference source module includes: a seventh current source I7, a fourteenth N-type transistor N14, a fifteenth N-type transistor N15, a second P-type transistor P2, a seventeenth N-type transistor N17, a sixth resistor R6, a twentieth P-type transistor P20, a tenth P-type transistor P10, and an eleventh P-type transistor; the seventh current source I7 The first terminal of the seventh current source I7 is connected to the first terminal of the external power supply; the second terminal of the seventh current source I7 is connected to the collector of the fourteenth N-type transistor N14; the base of the fourteenth N-type transistor N14 is connected to the base of the fifteenth N-type transistor N15; the collector of the fourteenth N-type transistor N14 is connected to the base; the emitter of the fourteenth N-type transistor N14 is connected to the second terminal of the external power supply; the collector of the fifteenth N-type transistor N15 is connected to the collector of the second P-type transistor P2; the fifteenth N-type transistor N... The emitter of transistor N15 is connected to the second terminal of an external power supply; the base of the seventeenth N-type transistor N17 is connected to the base of the fifteenth N-type transistor N15; the collector of the seventeenth N-type transistor N17 is connected to the first terminal of the sixth resistor R6 and the base of the nineteenth N-type transistor; the emitter of the seventeenth N-type transistor N17 is connected to the second terminal of an external power supply; the base of the tenth N-type transistor is connected to the collector and the second terminal of the sixth resistor R6; the collector of the tenth N-type transistor is connected to the second terminal of the twentyth N-type transistor N15. The collector of P-type transistor P20 is connected, and the emitter of the tenth N-type transistor is connected to the collector and base of the eleventh N-type transistor; the emitter of the eleventh N-type transistor is connected to the current source drive module; the base of the twentieth P-type transistor P20 is connected to the base of the second P-type transistor P2, and the collector of the twentieth P-type transistor P20 is connected to the first terminal of the external power supply; the base and collector of the second P-type transistor P2 are connected, and the emitter of the second P-type transistor P2 is connected to the first terminal of the external power supply.

[0110] The circuit in this embodiment is suitable for power operational amplifiers with large output current capability and large driving transistor area. Because of the large output current capability, the area of ​​the third N-type transistor N3 is large. However, the emitter current of the third N-type transistor N3 is small when unloaded. Therefore, it is difficult to make the static current of N10, N11 and N3 proportional to the emitter area through parameter design.

[0111] A1 is the input stage circuit;

[0112] N1 is the input transistor of the main operational amplifier gain stage, and N1, N9, N16, and P3 constitute the gain stage;

[0113] N9 forms a shunt circuit;

[0114] V1 and V2 are bias voltages;

[0115] N2, N3, N4, N5, R2, R3, R4, and R5 constitute the drive stage;

[0116] N3 is a current source drive transistor, and N2 and N3 form a Darlington structure; R3 is the degenerate resistor of N3, which is generally very small in resistance.

[0117] N5 is a current sink drive transistor, and N4 and N5 form a Darlington structure; R5 is the degradation resistor of N5, which is generally very small in resistance.

[0118] I7 is the reference current, and N14, N15, and P2 are mirror circuits that mirror the reference current to other circuits proportionally.

[0119] N18, N19, N20, N21, N22, P4, P5, P18, and P19 are static current controlled operational amplifiers;

[0120] The positive input terminal of the quiescent current-controlled operational amplifier is connected to the collector of N17, and... As a dynamic reference, the positive input terminal of the static current-controlled op-amp is the base of N19;

[0121] P20, N10, N11, N17, and R6 constitute a dynamic reference circuit, and the dynamic reference voltage is...

[0122]

[0123]

[0124] Therefore

[0125]

[0126] Based on the virtual short characteristic of the quiescent current-controlled operational amplifier, we have

[0127]

[0128] If both N2 and N3 operate in the amplification region, then the quiescent current of the driver stage is mainly determined by the collector current of N3. Therefore, the quiescent current of the driver stage is...

[0129]

[0130] Since N2 and N10 are similar devices, and the area of ​​N2 is not large, their base-emitter voltages can be considered to be similar.

[0131]

[0132] From the above equation, it can be seen that the static current of the drive stage is related to... The base-emitter voltage and other process parameters of the NPN transistor are irrelevant. Although the quiescent current of the drive stage is still related to the resistance value, it is not relevant to the process parameters of the NPN transistor. Figure 6 For power operational amplifiers with large output current capability and large driver transistor area, it is reasonable to appropriately relax the static current parameter. However, this invention still limits the deviation of the static current to the smallest possible range.

[0133] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0134] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A quiescent current control circuit for an operational amplifier, the operational amplifier comprising: The input stage module, the gain module, the current source driving module and the current sink driving module are characterized in that the control circuit comprises a static control feedback module; The static control feedback module is connected with the current source driving module and the current sink driving module respectively, and is used for increasing the current sink driving current output to the current sink driving module when the current source driving voltage of the current source driving module collected is less than the first reference voltage; The output end of the current sink driving module is connected with the input stage module, and the current sink driving module is used for decreasing the target voltage according to the current sink driving current, and is further used for feeding back the target voltage to the input stage module; The input stage module is connected with the gain module, and is used for decreasing the gain driving current output to the gain module according to the decreased target voltage; The gain module is connected with the current source driving module, and is used for increasing the current source driving current input to the current source driving module according to the decreased gain driving current; The current source driving module is further used for increasing the driving stage static current according to the increased current source driving current.

2. A quiescent current control circuit as claimed in claim 1, characterized in that The static control feedback module comprises a second amplifier; The non-inverting input end of the second amplifier is used for inputting the first reference voltage, the inverting input end of the second amplifier is connected with the current source driving module, and the output end of the second amplifier is connected with the current sink driving module.

3. A quiescent current control circuit as claimed in claim 2, characterized in that The control circuit further comprises a first reference source module connected with the static control feedback module, and used for providing the first reference voltage for the static control feedback module; The first end of the third current source is connected with the first end of an external power supply, and the second end of the third current source is connected with the collector of the tenth N-type transistor; The base of the tenth N-type transistor is connected with the first end of the fourth current source and the non-inverting input end of the second amplifier through the sixth resistor respectively, the collector of the tenth N-type transistor is connected with the base, and the emitter of the tenth N-type transistor is connected with the current sink driving module through the seventh resistor; The second end of the fourth current source is connected with the second end of the external power supply; The inverting input end of the second amplifier is connected with the base of the third N-type transistor.

4. A quiescent current control circuit as claimed in claim 2, characterized in that The control circuit further comprises a first reference source module connected with the static control feedback module, and used for providing the first reference voltage for the static control feedback module; The first reference source module comprises a third current source, a tenth N-type transistor, an eleventh N-type transistor, a sixth resistor, a seventh resistor and a fourth current source; The first end of the third current source is connected with the first end of an external power supply, and the second end of the third current source is connected with the collector of the tenth N-type transistor; The base of the tenth N-type transistor is connected with the first end of the fourth current source and the non-inverted input end of the second amplifier through the sixth resistor, the collector of the tenth N-type transistor is connected with the base, and the emitter of the tenth N-type transistor is connected with the collector of the eleventh N-type transistor; The base of the eleventh N-type transistor is connected with the collector, and the emitter of the tenth N-type transistor is connected with the current sink driving module through the seventh resistor; The second end of the fourth current source is connected with the second end of the external power supply; The non-inverted input end of the second amplifier is connected with the base of the second N-type transistor.

5. A quiescent current control circuit as defined in claim 2, wherein, The second amplifier comprises an eighteenth N-type transistor, a nineteenth N-type transistor, a twentieth N-type transistor, a twenty-first N-type transistor, a twenty-second N-type transistor, a fourth P-type transistor, a fifth P-type transistor, an eighteenth P-type transistor and a nineteenth P-type transistor; The base of the eighteenth N-type transistor is used for receiving a reference current, the collector of the eighteenth N-type transistor is connected with the emitter of the nineteenth N-type transistor and the emitter of the twentieth N-type transistor, and the emitter of the eighteenth N-type transistor is connected with the second end of the external power supply; The base of the nineteenth N-type transistor is connected with the first reference source module, the collector of the nineteenth N-type transistor is connected with the collector of the fifth P-type transistor and the emitter of the nineteenth P-type transistor; The base of the twentieth N-type transistor is connected with the current sink driving module, the collector of the twentieth N-type transistor is connected with the collector of the fourth P-type transistor and the emitter of the eighteenth P-type transistor; The base of the fourth P-type transistor is connected with the base of the second P-type transistor and the base of the fifth P-type transistor, the emitter of the fourth P-type transistor is connected with the second end of the external power supply, and the collector of the fourth P-type transistor is connected with the eighteenth P-type transistor; The emitter of the fifth P-type transistor is connected with the first end of the external power supply, and the collector of the fifth P-type transistor is connected with the emitter of the nineteenth P-type transistor; The base of the eighteenth P-type transistor is used for inputting a second bias voltage, and the collector of the eighteenth P-type transistor is connected with the collector of the twenty-first N-type transistor; The base of the nineteenth P-type transistor is connected with the base of the eighteenth P-type transistor, and the collector of the nineteenth P-type transistor is connected with the collector of the twenty-second N-type transistor and the current sink driving module; The base of the twenty-first N-type transistor is connected with the base of the twenty-second N-type transistor, the collector of the twenty-first N-type transistor is connected with the base, and the emitter of the twenty-first N-type transistor is connected with the second end of the external power supply; The emitter of the twenty-second N-type transistor is connected with the second end of the external power supply.

6. A quiescent current control circuit as claimed in claim 5, characterized in that The control circuit further comprises a first reference source module connected with the static control feedback module, for providing a first reference voltage and a reference current for the static control feedback module. The first reference source module comprises a seventh current source, a fourteenth N-type transistor, a fifteenth N-type transistor, a second P-type transistor, a tenth N-type transistor and a seventeenth N-type transistor; The first end of the seventh current source is connected with the first end of an external power supply, and the second end of the seventh current source is connected with the collector of the fourteenth N-type transistor; The base of the fourteenth N-type transistor is connected with the base of the fifteenth N-type transistor, the collector of the fourteenth N-type transistor is connected with the base, and the emitter of the fourteenth N-type transistor is connected with the second end of the external power supply; The collector of the fifteenth N-type transistor is connected with the collector of the second P-type transistor, and the emitter of the fifteenth N-type transistor is connected with the second end of the external power supply; The base of the seventeenth N-type transistor is connected with the base of the fifteenth N-type transistor, the collector of the seventeenth N-type transistor is connected with the emitter of the tenth N-type transistor and the base of the nineteenth N-type transistor respectively, and the emitter of the seventeenth N-type transistor is connected with the second end of the external power supply; The base of the tenth N-type transistor is connected with the collector, and the collector of the tenth N-type transistor is connected with a current source driving module; The base of the second P-type transistor is connected with the base of a fourth P-type transistor and the base of a fifth P-type transistor respectively, the collector of the second P-type transistor is connected with the first end of the external power supply, and the collector of the second P-type transistor is connected with the base.

7. A quiescent current control circuit as claimed in claim 5, characterized in that The control circuit further comprises a first reference source module connected with the static control feedback module, for providing a first reference voltage and a reference current for the static control feedback module; The first reference source module comprises a seventh current source, a fourteenth N-type transistor, a fifteenth N-type transistor, a second P-type transistor, a seventeenth N-type transistor, a sixth resistor, a twentieth P-type transistor, a tenth N-type transistor and an eleventh N-type transistor; The first end of the seventh current source is connected with the first end of an external power supply, and the second end of the seventh current source is connected with the collector of the fourteenth N-type transistor; The base of the fourteenth N-type transistor is connected with the base of the fifteenth N-type transistor, the collector of the fourteenth N-type transistor is connected with the base, and the emitter of the fourteenth N-type transistor is connected with the second end of the external power supply; The collector of the fifteenth N-type transistor is connected with the collector of the second P-type transistor, and the emitter of the fifteenth N-type transistor is connected with the second end of the external power supply; The base of the seventeenth N-type transistor is connected with the base of the fifteenth N-type transistor, the collector of the seventeenth N-type transistor is connected with the first end of the sixth resistor and the base of the nineteenth N-type transistor respectively, and the emitter of the seventeenth N-type transistor is connected with the second end of the external power supply; The base of the tenth N-type triode is connected with the collector and the second end of the sixth resistor respectively, the collector of the tenth N-type triode is connected with the collector of the twentieth P-type triode, and the emitter of the tenth N-type triode is connected with the collector and the base of the eleventh N-type triode; The emitter of the eleventh N-type triode is connected with a current source driving module; The base of the twentieth P-type triode is connected with the base of the second P-type triode, and the collector of the twentieth P-type triode is connected with the first end of an external power supply; The base of the second P-type triode is connected with the collector, and the emitter of the second P-type triode is connected with the first end of an external power supply.

8. An operational amplifier characterized by comprising: The static current control circuit comprises the input stage module, the gain module, the current source driving module and the current sink driving module. The input stage module comprises a first amplifier, the non-inverting input end of the first amplifier is connected with the output end of the current sink driving module, and the output end of the first amplifier is connected with the gain module; The current source driving module comprises a second N-type triode, a third N-type triode, a second resistor and a third resistor, and the current sink driving module comprises a fourth N-type triode, a fifth N-type triode, a fourth resistor and a fifth resistor; The base of the second N-type triode is connected with the collector of the first N-type triode, the collector of the second N-type triode is connected with the first end of an external power supply, and the emitter of the second N-type triode is connected with the first end of the second resistor; the base of the second N-type triode is also connected with the inverting input end of the second amplifier, or the emitter of the second N-type triode is also connected with the inverting input end of the second amplifier; The base of the third N-type triode is connected with the emitter of the second N-type triode, the collector of the third N-type triode is connected with the first end of an external power supply, and the emitter of the third N-type triode is connected with the first end of the third resistor; The second end of the third resistor is connected with the first end of the second resistor; The base of the fourth N-type triode is connected with the output end of the second amplifier, the collector of the fourth N-type triode is connected with the first end of an external power supply, and the emitter of the fourth N-type triode is connected with the first end of the fourth resistor; The second end of the fourth resistor is connected with the second end of the external power supply; The base of the fifth N-type triode is connected with the emitter of the fourth N-type triode, the collector of the fifth N-type triode is connected with the second end of the second resistor, the collector of the fifth N-type triode is also connected with the input stage module, and the emitter of the fifth N-type triode is connected with the first end of the fifth resistor; The second end of the fifth resistor is also connected with the second end of the fourth resistor; The gain module comprises a first N-type triode, a first current source and a second current source; The base of the first N-type triode is connected with the output end of the input stage module, the collector of the first N-type triode is connected with the second end of the second current source and the current source driving module respectively, and the emitter of the first N-type triode is connected with the first end of the first current source. The first end of the second current source is connected with the first end of an external power supply. The second end of the first current source is connected with the second end of the external power supply.

9. An operational amplifier as claimed in claim 8, characterised in that, The operational amplifier further comprises a first limit control module and a second limit control module. The first limit control module is connected with the current source driving module, and is used for shunting the current source driving current of the current source driving module when the collected current source output voltage output by the current source driving module is less than a second reference voltage. The current source driving module is used for reducing the output of a first limit current according to the reduced current source driving current. The second limit control module is connected with the current sink driving module, and is used for shunting the current sink driving current of the current sink driving module when the collected current sink output voltage output by the current sink driving module is greater than a third reference voltage. The current sink driving module is used for reducing the output of a second limit current according to the reduced current source driving current.

10. An operational amplifier characterized by comprising: The static current control circuit comprises the input stage module, the gain module, the current source driving module and the current sink driving module. The input stage module comprises a first amplifier, the non-inverting input end of the first amplifier is connected with the output end of the current sink driving module, and the output end of the first amplifier is connected with the gain module. The current source driving module comprises a second N-type triode, a third N-type triode, a second resistor and a third resistor, and the current sink driving module comprises a fourth N-type triode, a fifth N-type triode, a fourth resistor and a fifth resistor. The base of the second N-type triode is connected with the collector of the first N-type triode, the collector of the second N-type triode is connected with the first end of an external power supply, the emitter of the second N-type triode is connected with the first end of the second resistor, the base of the second N-type triode is further connected with the inverting input end of the second amplifier, or the emitter of the second N-type triode is further connected with the inverting input end of the second amplifier. The base of the third N-type triode is connected with the emitter of the second N-type triode, the collector of the third N-type triode is connected with the first end of the external power supply, and the emitter of the third N-type triode is connected with the first end of the third resistor. The second end of the third resistor is connected with the first end of the second resistor. The base of the fourth N-type triode is connected with the output end of the second amplifier, the collector of the fourth N-type triode is connected with the first end of an external power supply, the emitter of the fourth N-type triode is connected with the first end of the fourth resistor. The second end of the fourth resistor is connected with the second end of the external power supply. The base of the fifth N-type triode is connected with the emitter of the fourth N-type triode, the collector of the fifth N-type triode is connected with the second end of the second resistor, the collector of the fifth N-type triode is also connected with the input stage module, and the emitter of the fifth N-type triode is connected with the first end of the fifth resistor; The second end of the fifth resistor is also connected with the second end of the fourth resistor; The gain module comprises a first N-type triode, a third P-type triode, a ninth N-type triode and a sixteenth N-type triode; The base of the first N-type triode is connected with the output end of the first amplifier, the collector of the first N-type triode is connected with the collector of the third P-type triode, and the emitter of the first N-type triode is connected with the collector of the sixteenth N-type triode; The base of the sixteenth N-type triode is connected with the base of the fifteenth N-type triode, and the emitter of the sixteenth N-type triode is connected with the second end of the external power supply; The base of the ninth N-type triode is used for inputting a first reference voltage, the collector of the ninth N-type triode is connected with the first end of the external power supply, and the emitter of the ninth N-type triode is connected with the emitter of the first N-type triode; The base of the third P-type triode is connected with the base of the second P-type triode, and the emitter of the third P-type triode is connected with the first end of the external power supply.

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