一种改进型微弱电流低噪声放大应用电路

针对微弱电流信号检测技术存在的背景噪声、电路噪声、元器件噪声等的干扰往往大于信号本身,从而影响测量结果准确性的问题,设计了一种微弱电流低噪声信号放大应用电路.该设计采用高精度、小阻值的反馈电阻和高性能运算放大器AD795对T型I/V转换电路进行改进,选用高性能分立元件搭建前置放大电路,进而基于调制-解调原理设计锁相放大电路.软件仿真结果表明,电路具有较强的噪声抑制能力和稳定性,可以满足各种传感器微弱信号的测量要求....

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Published in郑州轻工业学院学报（自然科学版） Vol. 30; no. 3; pp. 118 - 122
Main Author 姜利英 岳保磊 梁茂 周鹏磊 肖小楠
Format Journal Article
LanguageChinese
Published 郑州轻工业学院 电气信息工程学院,河南 郑州,450002 2015
Subjects
T型I/V转换
低噪声
前置放大
微弱电流
锁相放大
低噪声
T-type I /V conversion
锁相放大
T型I/V转换
low noise
preamplifier
phase-locked amplifier
微弱电流
前置放大
weak current
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Summary:针对微弱电流信号检测技术存在的背景噪声、电路噪声、元器件噪声等的干扰往往大于信号本身,从而影响测量结果准确性的问题,设计了一种微弱电流低噪声信号放大应用电路.该设计采用高精度、小阻值的反馈电阻和高性能运算放大器AD795对T型I/V转换电路进行改进,选用高性能分立元件搭建前置放大电路,进而基于调制-解调原理设计锁相放大电路.软件仿真结果表明,电路具有较强的噪声抑制能力和稳定性,可以满足各种传感器微弱信号的测量要求.
Bibliography:weak current ; low noise ; T-type I/V conversion ; preamplifier; phase-locked amplifier
41-1422/TS
In order to solve the problem in weak current signal detection technology that the interference of background noise,circuit noise and component noise is stronger than signal itself,a weak current low noise amplifier application circuit was designed. The model improved T-type I / V conversion circuit by adopting high precision and small resistance value feed back resistance and high performance operational amplifier AD795,set up preamplifier circuit by high performance discrete elements and designed phrase-locked amplifier circuit based on modulation and demodulation principle. The simulation analysis showed that the circuit had higher noise suppression capability and stability and could meet the weak current measurement requirement of various sensors.
JIANG Li-ying, YUE Bao-lei, LIANG Mao, ZHOU Peng-lei, XIAO Xiao-nan （ College of Electric and Information Engineering, Zhengzhou University of Light Industry, Zhengzh
ISSN:2095-476X
DOI:10.3969/j.issn.2095-476X.2015.3/4.026