A driving circuit for reducing the influence of ground resistance on the precision of a current mirror

Abstract

The application relates to a driving circuit for reducing the influence of ground resistance on the precision of a current mirror, comprising a reference voltage source, a first voltage follower circuit, a current mirror module, and a second voltage follower circuit; the reference voltage source comprises a reference voltage source and a voltage amplification adjustment circuit connected in sequence; the current mirror module comprises a first current mirror circuit, a channel selection module, a second current mirror circuit, and a third current mirror circuit; the output ends of the second current mirror circuit and the third current mirror circuit are respectively electrically connected with the input ends of the second voltage follower circuit. The driving circuit for reducing the influence of ground resistance on the precision of a current mirror can select different channels when different current outputs are needed, so that the precision requirements of large current output and small current output can be met simultaneously.

Description

Technical Field

[0001] This disclosure belongs to the field of constant current source technology, and specifically relates to a drive circuit that reduces the impact of grounding resistance on the accuracy of a current mirror. Background Technology

[0002] Device mismatch is prevalent in integrated circuits, especially in advanced manufacturing processes. As the feature dimensions of the process approach the physical dimensions of atoms and the wavelengths of lithography rays, the relative proportion of deviations in device channel length and width gradually increases. Various factors in the process flow, such as humidity and temperature, affect device parameter variations. Even devices designed identically will always exhibit some degree of difference after manufacturing, even within the same process. Factories strive to minimize these deviations through strict process control. However, the impact of grounding resistance on the accuracy of current mirrors cannot be eliminated, and output accuracy remains a challenge when current mirrors output a wide range of currents. Summary of the Invention

[0003] This invention provides a drive circuit that reduces the impact of grounding resistance on the accuracy of a current mirror, aiming to at least solve one of the technical problems existing in the prior art.

[0004] The technical solution of this invention is a driving circuit for reducing the impact of grounding resistance on the accuracy of a current mirror, comprising: a reference voltage source, the reference voltage source including a reference voltage source and a voltage amplification and adjustment circuit connected in sequence; a first voltage follower circuit, the first voltage follower circuit being electrically connected to the voltage amplification and adjustment circuit; a current mirror module, the current mirror module including a first current mirror circuit, a channel selection module, a second current mirror circuit, and a third current mirror circuit, the channel selection module being used to select whether the current of the second current mirror circuit and the third current mirror circuit is connected, the input terminal of the first current mirror circuit is electrically connected to the output terminal of the first voltage follower circuit, the output terminal of the first current mirror circuit is connected to the input terminal of the channel selection module, the input terminals of the second current mirror circuit and the third current mirror circuit are respectively connected to the output terminal of the channel selection module; and a second voltage follower circuit, the output terminals of the second current mirror circuit and the third current mirror circuit being respectively electrically connected to the input terminal of the second voltage follower circuit.

[0005] Furthermore, the reference voltage source is a bandgap reference voltage source, and the input terminal of the voltage amplification and adjustment circuit is electrically connected to the output terminal of the reference voltage source. The voltage amplification and adjustment circuit includes a first operational amplifier, a first resistor, a second resistor, and a third resistor. The output terminal of the bandgap reference voltage source is connected to the inverting input terminal of the first operational amplifier through the second resistor, the non-inverting input terminal of the first operational amplifier is grounded through the first resistor, and the output terminal of the first operational amplifier is connected to the inverting input terminal of the first operational amplifier through the third resistor.

[0006] Furthermore, the first voltage follower circuit includes a second operational amplifier, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, the output terminal of the first operational amplifier is connected to the non-inverting input terminal of the second operational amplifier through a fourth resistor, and the non-inverting input terminal of the second operational amplifier is grounded through a fifth resistor.

[0007] Furthermore, the fourth resistor is an adjustable resistor.

[0008] Furthermore, the first current mirror circuit includes a first field-effect transistor (FET), a second field-effect transistor (FET), a third field-effect transistor (FET), a fourth field-effect transistor (FET), and a sixth resistor. The gates and drains of the first, second, third, and fourth FETs are respectively connected to the output of the first voltage follower circuit. The source of the first FET is connected to the drain of the second FET. The source of the second FET is connected to the sixth resistor. The other end of the sixth resistor is connected to ground. The sixth resistor is a grounding resistor. The current flowing through the sixth resistor is a first current. The source of the third FET is connected to the drain of the fourth FET. The source of the fourth FET outputs a second current, which is input to the channel selection module.

[0009] Furthermore, it also includes a current monitoring module, which is connected to the source of the fourth field-effect transistor, and the current monitoring module includes at least one reference current input.

[0010] Furthermore, the second current mirror circuit includes a fifth field-effect transistor, a sixth field-effect transistor, and a seventh resistor. The drain of the fifth field-effect transistor is connected to the output of the first current mirror circuit, the source of the fifth field-effect transistor is connected to the drain of the sixth field-effect transistor, the gate of the fifth field-effect transistor is connected to the source of the sixth field-effect transistor, the source of the sixth field-effect transistor is connected to one end of the seventh resistor, the gate of the sixth field-effect transistor is connected to the other end of the seventh resistor, and the other end of the seventh resistor outputs a third current, which is input to the channel selection module.

[0011] Furthermore, the third current mirror circuit includes a seventh field-effect transistor and an eighth field-effect transistor. The source of the seventh field-effect transistor is connected to the output of the channel selection module, the gate of the seventh field-effect transistor is connected to the gate of the eighth field-effect transistor, the drain of the seventh field-effect transistor and the drain of the eighth field-effect transistor are grounded, and the source of the eighth field-effect transistor outputs a fourth current.

[0012] Furthermore, the second voltage follower circuit includes a third operational amplifier, the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier, the output terminal of the current mirror module is connected to the non-inverting input terminal of the third operational amplifier through a seventh resistor, and the non-inverting input terminal of the third operational amplifier is grounded through an eighth resistor.

[0013] Furthermore, the eighth resistor is an adjustable resistor.

[0014] The beneficial effects of the present invention are as follows:

[0015] This application proposes a driving circuit to reduce the impact of grounding resistance on the accuracy of a current mirror. This driving circuit can select different channels for different current outputs, simultaneously meeting the accuracy requirements of both high and low current outputs. Specifically, the channel selection module can determine whether to use the second or third current mirror circuit as the output, or to connect both, based on the detection of the output current of the first current mirror circuit by the current monitoring module. Furthermore, the adjustable fourth resistor in the voltage amplification and adjustment circuit, the first voltage follower circuit, and the second voltage follower circuit, as well as the adjustable seventh resistor, also achieve the technical effect of current regulation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a drive circuit according to the present invention for reducing the influence of grounding resistance on the accuracy of the current mirror.

[0017] Figure 2 This is a voltage amplification and adjustment circuit for a drive circuit that reduces the impact of grounding resistance on the accuracy of the current mirror according to the present invention.

[0018] Figure 3 This is the first voltage follower circuit of the drive circuit according to the present invention for reducing the influence of grounding resistance on the accuracy of the current mirror.

[0019] Figure 4 This is the first current mirror circuit according to the present invention, which reduces the influence of grounding resistance on the accuracy of the current mirror.

[0020] Figure 5This is the second current mirror circuit according to the present invention, which is a microfluidic chip insertion drive circuit that reduces the influence of grounding resistance on the accuracy of the current mirror.

[0021] Figure 6 This is the third current mirror circuit of the microfluidic chip insertion drive circuit according to the present invention, which reduces the influence of grounding resistance on the accuracy of the current mirror.

[0022] Figure 7 This is a second voltage follower circuit of the microfluidic chip insertion drive circuit according to the present invention, which reduces the influence of grounding resistance on the accuracy of the current mirror.

[0023] In the above figure, 100 is the reference voltage source; 110 is the reference voltage source; 120 is the voltage amplification and adjustment circuit; 200 is the first voltage follower circuit; 300 is the current mirror module; 310 is the first current mirror circuit; 320 is the channel selection module; 330 is the second current mirror circuit; 340 is the third current mirror circuit; and 400 is the second voltage follower circuit. Detailed Implementation

[0024] The following will provide a clear and complete description of the concept, specific structure, and technical effects of the present invention in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of the present invention. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0025] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," "right," "top," and "bottom" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings.

[0026] Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and not for limiting the invention. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0027] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various elements, these elements should not be limited to these terms. These terms are only used to distinguish elements of the same type from one another. For example, without departing from the scope of this disclosure, a first element may also be referred to as a second element, and similarly, a second element may also be referred to as a first element.

[0028] Reference Figures 1 to 7This application proposes a driving circuit to reduce the impact of grounding resistance on the accuracy of a current mirror, comprising: (referring to...) Figure 1 The system includes a reference voltage source 100, comprising a reference voltage source 110 and a voltage amplification and adjustment circuit 120 connected in sequence; a first voltage follower circuit 200 electrically connected to the voltage amplification and adjustment circuit 120; and a current mirror module 300, comprising a first current mirror circuit 310, a channel selection module 320, a second current mirror circuit 330, and a third current mirror circuit 340, wherein the channel selection module 320 is used to select whether the second current mirror circuit 330 and the third current mirror circuit are connected. The input terminal of the first current mirror circuit 310 is electrically connected to the output terminal of the first voltage follower circuit 200, and the output terminal of the first current mirror circuit 310 is connected to the input terminal of the channel selection module 320. The input terminals of the second current mirror circuit 330 and the third current mirror circuit 340 are respectively connected to the output terminal of the channel selection module 320. The second voltage follower circuit 400 has its output terminals of the second current mirror circuit 330 and the third current mirror circuit 340 respectively electrically connected to the input terminal of the second voltage follower circuit 400.

[0029] The beneficial effects of the present invention are as follows:

[0030] This application proposes a driving circuit to reduce the impact of grounding resistance on the accuracy of a current mirror. This driving circuit can select different channels for different current outputs, simultaneously meeting the accuracy requirements of both high and low current outputs. Specifically, the channel selection module 320 can determine whether to use the second current mirror circuit 330 or the third current mirror circuit 340 as the output, or to simultaneously connect both, based on the detection of the output current of the first current mirror circuit 310 by the current monitoring module. Furthermore, the adjustable fourth resistor of the voltage amplification and adjustment circuit 120, the first voltage follower circuit, and the seventh resistor of the second voltage follower circuit 400 also achieve the technical effect of current regulation.

[0031] Furthermore, refer to Figure 2The reference voltage source 110 is a bandgap reference voltage source 110. The input terminal of the voltage amplification and adjustment circuit 120 is electrically connected to the output terminal of the reference voltage source 110. The voltage amplification and adjustment circuit 120 includes a first operational amplifier U1, a first resistor R1, a second resistor R2, and a third resistor R3. The output terminal of the bandgap reference voltage source 110 is connected to the inverting input terminal (-) of the first operational amplifier U1 through the second resistor R2. The non-inverting input terminal (+) of the first operational amplifier U1 is grounded through the first resistor R1. The output terminal of the first operational amplifier U1 is connected to the inverting input terminal (-) of the first operational amplifier U1 through the third resistor R3.

[0032] Furthermore, refer to Figure 3 The first voltage follower circuit 200 includes a second operational amplifier U2. The inverting input (-) of the second operational amplifier U2 is connected to its output. The output of the first operational amplifier U1 is connected to the non-inverting input (+) of the second operational amplifier U2 through a fourth resistor R4. The non-inverting input (+) of the second operational amplifier U2 is grounded through a fifth resistor R5. The first voltage follower circuit 200 provides circuit isolation.

[0033] Furthermore, refer to Figure 3 The fourth resistor R4 is an adjustable resistor. The adjustable nature of the fourth resistor R4 allows the user to adjust its resistance value in real time, thereby controlling the voltage amplification factor.

[0034] Furthermore, refer to Figure 4 The first current mirror circuit 310 includes a first field-effect transistor M1, a second field-effect transistor M2, a third field-effect transistor M3, a fourth field-effect transistor M4, and a sixth resistor R6. The gates and drains of the first field-effect transistor M1, the second field-effect transistor M2, the third field-effect transistor M3, and the fourth field-effect transistor M4 are respectively connected to the output of the first voltage follower circuit 200. The source of the first field-effect transistor M1 is connected to the drain of the second field-effect transistor M2. The source of the second field-effect transistor M2 is connected to the sixth resistor R6. The other end of the sixth resistor R6 is connected to ground. The sixth resistor R6 is a grounding resistor. The current flowing through the sixth resistor R6 is the first current I1. The source of the third field-effect transistor M3 is connected to the drain of the fourth field-effect transistor M4. The source of the fourth field-effect transistor M4 outputs a second current I2. The second current I2 is input to the channel selection module 320.

[0035] Furthermore, refer to Figure 4It also includes a current monitoring module, which is connected to the source of the fourth field-effect transistor M4. The current monitoring module includes at least one reference current input. The current monitoring module monitors the magnitude of the second current, thereby providing a basis for the channel selection module's judgment.

[0036] Furthermore, refer to Figure 5 The second current mirror circuit 330 includes a fifth field-effect transistor M5, a sixth field-effect transistor M6, and a seventh resistor R7. The drain of the fifth field-effect transistor M5 is connected to the output of the first current mirror circuit 310, the source of the fifth field-effect transistor M5 is connected to the drain of the sixth field-effect transistor M6, the gate of the fifth field-effect transistor M5 is connected to the source of the sixth field-effect transistor M6, the source of the sixth field-effect transistor M6 is connected to one end of the seventh resistor R7, the gate of the sixth field-effect transistor M6 is connected to the other end of the seventh resistor R7, and the other end of the seventh resistor R7 outputs a third current I3, which is input to the channel selection module 320.

[0037] Furthermore, refer to Figure 6 The third current mirror circuit 340 includes a seventh field-effect transistor M7 and an eighth field-effect transistor M8. The source of the seventh field-effect transistor M7 is connected to the output of the channel selection module 320, the gate of the seventh field-effect transistor M7 is connected to the gate of the eighth field-effect transistor M8, the drain of the seventh field-effect transistor M7 and the drain of the eighth field-effect transistor M8 are grounded, and the source of the eighth field-effect transistor M8 outputs a fourth current.

[0038] Furthermore, refer to Figure 7 The second voltage follower circuit 400 includes a third operational amplifier U3. The inverting input terminal (-) of the third operational amplifier U3 is connected to the output terminal of the third operational amplifier U3. The output terminal of the current mirror module 300 is connected to the non-inverting input terminal (+) of the third operational amplifier U3 through a seventh resistor R7. The non-inverting input terminal (+) of the third operational amplifier U3 is grounded through an eighth resistor.

[0039] Furthermore, the eighth resistor R8 is an adjustable resistor. The adjustable nature of the eighth resistor R8 allows the user to adjust its resistance value in real time, thereby controlling the voltage amplification factor.

[0040] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this disclosure, as long as they achieve the same technical effects, should be included within the scope of protection of this disclosure and fall under the protection scope of the present invention. Within the protection scope of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A drive circuit for reducing the impact of grounding resistance on the accuracy of a current mirror, characterized in that, include: A reference voltage source (100) includes a reference voltage source (110) and a voltage amplification and regulation circuit (120) connected in sequence. A first voltage follower circuit (200) is electrically connected to the voltage amplification and regulation circuit (120); A current mirror module (300) includes a first current mirror circuit (310), a channel selection module (320), a second current mirror circuit (330), and a third current mirror circuit (340). The channel selection module (320) is used to select whether the current of the second current mirror circuit (330) and the third current mirror circuit is connected. The input terminal of the first current mirror circuit (310) is electrically connected to the output terminal of the first voltage follower circuit (200). The output terminal of the first current mirror circuit (310) is connected to the input terminal of the channel selection module (320). The input terminals of the second current mirror circuit (330) and the third current mirror circuit (340) are respectively connected to the output terminal of the channel selection module (320). The first current mirror circuit (310) includes a first field-effect transistor, a second field-effect transistor, a third field-effect transistor, a fourth field-effect transistor, and a sixth resistor. The gates and drains of the first, second, third, and fourth field-effect transistors are respectively connected to the output of the first voltage follower circuit (200). The source of the first field-effect transistor is connected to the drain of the second field-effect transistor. The source of the second field-effect transistor is connected to the sixth resistor. The other end of the sixth resistor is connected to ground. The sixth resistor is a grounding resistor. The current flowing through the sixth resistor is the first current. The source of the third field-effect transistor is connected to the drain of the fourth field-effect transistor. The source of the fourth field-effect transistor outputs a second current. The second current is input to the channel selection module (320). The second current mirror circuit (330) includes a fifth field-effect transistor, a sixth field-effect transistor, and a seventh resistor. The drain of the fifth field-effect transistor is connected to the output of the first current mirror circuit (310). The source of the fifth field-effect transistor is connected to the drain of the sixth field-effect transistor. The gate of the fifth field-effect transistor is connected to the source of the sixth field-effect transistor. The source of the sixth field-effect transistor is connected to one end of the seventh resistor. The gate of the sixth field-effect transistor is connected to the other end of the seventh resistor. The other end of the seventh resistor outputs a third current, which is input to the channel selection module (320). The third current mirror circuit (340) includes a seventh field-effect transistor and an eighth field-effect transistor. The source of the seventh field-effect transistor is connected to the output of the channel selection module (320), the gate of the seventh field-effect transistor is connected to the gate of the eighth field-effect transistor, the drain of the seventh field-effect transistor and the drain of the eighth field-effect transistor are grounded, and the source of the eighth field-effect transistor outputs a fourth current. The output terminals of the second voltage follower circuit (400), the second current mirror circuit (330), and the third current mirror circuit (340) are electrically connected to the input terminal of the second voltage follower circuit (400), respectively.

2. The driving circuit for reducing the influence of grounding resistance on the accuracy of the current mirror according to claim 1, characterized in that, The reference voltage source (110) is a bandgap reference voltage source (110). The input terminal of the voltage amplification and adjustment circuit (120) is electrically connected to the output terminal of the reference voltage source (110). The voltage amplification and adjustment circuit (120) includes a first operational amplifier, a first resistor, a second resistor, and a third resistor. The output terminal of the bandgap reference voltage source (110) is connected to the inverting input terminal of the first operational amplifier through the second resistor. The non-inverting input terminal of the first operational amplifier is grounded through the first resistor. The output terminal of the first operational amplifier is connected to the inverting input terminal of the first operational amplifier through the third resistor.

3. The driving circuit for reducing the influence of grounding resistance on the accuracy of the current mirror according to claim 2, characterized in that, The first voltage follower circuit (200) includes a second operational amplifier, the inverting input terminal of the second operational amplifier is connected to the output terminal of the second operational amplifier, the output terminal of the first operational amplifier is connected to the non-inverting input terminal of the second operational amplifier through a fourth resistor, and the non-inverting input terminal of the second operational amplifier is grounded through a fifth resistor, wherein the fourth resistor is an adjustable resistor.

4. The driving circuit for reducing the influence of grounding resistance on the accuracy of the current mirror according to claim 1, characterized in that, It also includes a current monitoring module, which is connected to the source of the fourth field-effect transistor, and the current monitoring module includes at least one reference current input.

5. The driving circuit for reducing the influence of grounding resistance on the accuracy of the current mirror according to claim 1, characterized in that, The second voltage follower circuit (400) includes a third operational amplifier, the inverting input terminal of the third operational amplifier is connected to the output terminal of the third operational amplifier, the output terminal of the current mirror module (300) is connected to the non-inverting input terminal of the third operational amplifier through a seventh resistor, and the non-inverting input terminal of the third operational amplifier is grounded through an eighth resistor, which is an adjustable resistor.

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