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Differential amplifier common-mode rejection ratio and gain trimming circuit

A technology of differential amplifier and common mode rejection ratio, which is applied in the electronic field, can solve the problems of increasing the cost of test and adjustment time, increasing the cost of the circuit, etc., and achieve the effect of reducing the cost of test and adjustment, low circuit cost and reducing the cost of the circuit

Active Publication Date: 2020-06-26
SHANGHAI ANALOGY SEMICON TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only greatly increases the cost of the circuit, but also increases the cost of test and adjustment time

Method used

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  • Differential amplifier common-mode rejection ratio and gain trimming circuit
  • Differential amplifier common-mode rejection ratio and gain trimming circuit
  • Differential amplifier common-mode rejection ratio and gain trimming circuit

Examples

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Embodiment 1

[0040] This embodiment discloses a differential amplifier common-mode rejection ratio and gain trimming circuit, image 3A schematic diagram of the common-mode rejection ratio and gain trimming circuit of the differential amplifier in this embodiment is shown. The trimming circuit includes: a first trimming unit 10 and a second trimming unit 20 connected between the non-inverting input voltage INP and a reference voltage Vref, the first trimming unit 10 and the second trimming unit 20 The positive input terminal of the differential amplifier 50 is connected by means of a tap switch; the third trimming unit 30 and the fourth trimming unit 40 connected between the inverting input voltage INN and the output terminal Vout of the differential amplifier 50, said The third trimming unit 30 and the fourth trimming unit 40 are connected to the negative input end of the differential amplifier 50 through a tap switch. The gain can be fine-tuned by changing the tap positions of the first...

Embodiment 2

[0057] The trimming circuit in this embodiment is basically the same as the trimming circuit in Embodiment 1. The difference is that in this embodiment, the second trimming resistor strings R4a, R4b, R5a, and R5b respectively include 2 m unit resistance, therefore, the trimming bit in this embodiment is m+1bit.

Embodiment 3

[0059] The trimming circuit in this embodiment is basically the same as the trimming circuit in Embodiment 1, the difference is that in this embodiment, the second trimming auxiliary trimming resistor string R8a, R8b, R9a, R9b includes 2 parallel-connected n unit resistance. The first trimming resistor string R3a, R3b, R5a, R5b includes 2 n -1 unit resistance. In this example, the minimum resistance is Different minimum resistor values ​​can be used as desired.

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Abstract

The invention provides a differential amplifier common-mode rejection ratio and gain trimming circuit which comprises a first trimming unit and a second trimming unit which are connected between in-phase input voltage and reference voltage, wherein the first trimming unit and the second trimming unit are connected with the positive input end of a differential amplifier; a third trimming unit and afourth trimming unit which are connected between the inverted input voltage and the output end of the differential amplifier, and are connected with the negative input end of the differential amplifier; the first trimming unit, the second trimming unit, the third trimming unit and the fourth trimming unit comprise a first trimming resistor string and a second trimming resistor string which are connected in series, the first trimming resistor string is connected with a first trimming auxiliary resistor string in series, and the second trimming resistor string is connected with a second trimming auxiliary resistor string in series; the second trimming resistor string of the first trimming unit is connected with the second trimming resistor string of the second trimming unit, and the secondtrimming resistor string of the third trimming unit is connected with the second trimming resistor string of the fourth trimming unit.

Description

technical field [0001] The invention generally relates to the field of electronic technology, in particular to a differential amplifier common-mode rejection ratio and gain trimming circuit. Background technique [0002] With the rapid development of electronic technology, operational amplifier circuits have also been widely used. There are many types of integrated operational amplifiers. As a high-performance amplifier, instrumentation amplifiers are popular in data acquisition, sensor signal amplification, high-speed signal conditioning, medical instruments, and high-end audio equipment. The instrumentation amplifier integrates key components inside the amplifier, and achieves high common-mode rejection ratio, high input impedance, low noise, low linearity error, low offset drift gain, flexible setting and convenient use with a specific structure. [0003] The differential voltage amplifier is the core structural unit in the instrumentation amplifier circuit, and its typi...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03G3/30
CPCH03F3/45932H03G3/3089H03F3/45995H03F2203/45042H03F2203/45538H03G2201/106H03F2203/45594
Inventor 张俊杜毅颜志豪
Owner SHANGHAI ANALOGY SEMICON TECH LTD
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