The Research of Common-mode Rejection Capability of the Differential Amplifier

NIU Bin; CHEN Song-jing; SUN Jing-hua; LIANG Yuan-hua

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The Research of Common-mode Rejection Capability of the Differential Amplifier

更新时间：2026-07-10

- The Research of Common-mode Rejection Capability of the Differential Amplifier
- Vol. 14, Issue 1, Pages: 92-95(2009)
- 作者机构：
  
  哈尔滨理工大学测控技术与通信工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN722
- Published：2009
- 稿件说明：
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NIU Bin, CHEN Song-jing, SUN Jing-hua, et al. The Research of Common-mode Rejection Capability of the Differential Amplifier[J]. 2009, 14(1): 92-95.
DOI：

NIU Bin, CHEN Song-jing, SUN Jing-hua, et al. The Research of Common-mode Rejection Capability of the Differential Amplifier[J]. 2009, 14(1): 92-95. DOI：

摘要

电磁流量计输出的流速信号非常微弱

且常叠加共模干扰

经信号调理电路放大后

会导致信噪比很低

甚至淹没有用信号.针对这问题提出了利用前置放大电路有效抑制共模干扰

对其进行定性、定量分析

给出实际可行的提高差动放大电路输入阻抗的设计

并进行分析、推导和对比计算

证明其可以很大限度抑制共模干扰

提高测量准确度.

Abstract

The common-mode interference is always interfused with the weak velocity signal of the electromagnetic flowmeter

which can be amplified by the signal processing circuit.This causes low signal-to-noise ratio and even submerge the velocity signal.The paper used the preamplifier to reject common-mode interference effectively.We did qualitative analysis and quantitative analysis.We also showed practical design which can improve the amplifier’s input impedence.Then we did analysis

deduction and contrast for it.T...

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Related Author

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Related Institution

School of Measure-control Technology and Communications Engineering

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