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Current mirror for effectively inhibiting power source voltage influence

A power supply voltage and current mirror technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problem of large influence of output current, and achieve the effect of suppressing the influence of output current, offsetting errors, and improving the power supply rejection ratio

Active Publication Date: 2016-08-17
WUXI PROFESSIONAL COLLEGE OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Aiming at the problem that the drain-source voltage difference of the current mirror mirror tube has a great influence on the output current, the present invention provides a current mirror that can effectively suppress the influence of the power supply voltage, which can effectively improve the ability of the output current to suppress the fluctuation of the power supply voltage, and ensure Current accuracy

Method used

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  • Current mirror for effectively inhibiting power source voltage influence
  • Current mirror for effectively inhibiting power source voltage influence
  • Current mirror for effectively inhibiting power source voltage influence

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 2 , image 3 As shown, the reference current generating circuit includes a PMOS transistor PM1 and an NMOS transistor NM1, the gate of the PMOS transistor PM1 is connected to the drain of the NMOS transistor NM1, the source of the PMOS transistor PM1 is connected to the power supply, and the drain of the PMOS transistor PM1 is connected to the drain of the NMOS transistor NM1. drain; the gate of the NMOS transistor NM1 is connected to the bias voltage Vbias of the external port, and the source of the NMOS transistor NM1 is grounded; the first mirror circuit includes a PMOS transistor PM2 and an NMOS transistor NM2, and the gate of the PMOS transistor PM2 is connected to that of the NMOS transistor NM1 Drain, the source of the PMOS transistor PM2 is connected to the power supply, the drain of the PMOS transistor PM2 is connected to the drain of the NMOS transistor NM2, the gate of the NMOS transistor NM2 is connected to the drain of the NMOS transistor NM...

Embodiment 2

[0043] Such as Figure 4 As shown, the reference current generation circuit includes a PMOS transistor PM1 and an NMOS transistor NM1, the gate of the PMOS transistor PM1 is connected to the bias voltage Vbias of the external port, the source of the PMOS transistor PM1 is connected to the power supply, and the drain of the PMOS transistor PM1 is connected to the NMOS transistor NM1 The drain of the NMOS transistor NM1 is connected to the drain of the NMOS transistor NM1, and the source of the NMOS transistor NM1 is grounded; the first mirror circuit includes a PMOS transistor PM2 and an NMOS transistor NM2, and the gate of the PMOS transistor PM2 is connected to that of the NMOS transistor NM2. Drain, the source of the PMOS transistor PM2 is connected to the power supply, the drain of the PMOS transistor PM2 is connected to the drain of the NMOS transistor NM2, the gate of the NMOS transistor NM2 is connected to the drain of the NMOS transistor NM1, and the source of the NMOS t...

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PUM

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Abstract

The invention provides a current mirror for effectively inhibiting power source voltage influence. The inhibiting capability of output current on power supply voltage fluctuation can be effectively improved, and the current precision is ensured. The current mirror comprises a reference current generating circuit, a first mirror image circuit, a second mirror image circuit and a current output circuit, wherein the output end of the reference current generating circuit is connected with the input end of the first mirror image circuit and the input end of the second mirror image circuit; the output end of the first mirror image circuit and the output end of the second mirror image circuit output to the current output circuit.

Description

technical field [0001] The invention relates to the technical field of analog circuit design, in particular to a current mirror, in particular to a current mirror that effectively suppresses the influence of a power supply voltage. Background technique [0002] In analog circuit design, circuit modules often need to use more accurate bias current, which is very important for the stability and improvement of circuit performance, especially with the popularization of portable consumer electronics products in recent years, the power supply voltage is required to be within a certain The equipment can work normally within the changing range, which puts forward higher requirements for the design of the current mirror circuit. [0003] Conventional current mirror circuits such as figure 1 As shown, all the tubes in the circuit are required to work in the saturation region, where the gate of the PMOS tube PM1 is connected to the drain of the NMOS tube NM1, the source of the PMOS tu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F3/26
CPCG05F3/26
Inventor 王宇星钱英杰居吉乔
Owner WUXI PROFESSIONAL COLLEGE OF SCI & TECH
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