基于跨阻放大的微弱电容检测电路

在微弱信号的检测中有两大难点：一是检测电路精度低,无法实现对交流小信号的识别,二是信号处理电路难以将小信号从庞大的噪声流中分离出来。文中介绍的基于跨阻放大的检测电路可以实现1fF/ms的检测精度,且应用AD835的相敏解调电路及后续的低通滤波电路可以很好的将有用信号从噪声流中分离出来,克服了上述难点,实现了对微弱信号的提取。...

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Bibliographic Details
Published in电测与仪表 Vol. 52; no. 18; pp. 85 - 89
Main Author 穆林枫 张文栋 何常德 薛晨阳
Format Journal Article
LanguageChinese
Published 中北大学测试技术重点实验室，太原030051 2015
中北大学仪器科学与动态测试教育部重点实验室，太原030051
Subjects
噪声流
微弱信号
相敏解调
跨阻放大
weak signal
transimpedance amplifier
微弱信号
噪声流
相敏解调
phase sensitive demodulation
noise flow
跨阻放大
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ISSN1001-1390

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Summary:在微弱信号的检测中有两大难点：一是检测电路精度低,无法实现对交流小信号的识别,二是信号处理电路难以将小信号从庞大的噪声流中分离出来。文中介绍的基于跨阻放大的检测电路可以实现1fF/ms的检测精度,且应用AD835的相敏解调电路及后续的低通滤波电路可以很好的将有用信号从噪声流中分离出来,克服了上述难点,实现了对微弱信号的提取。
Bibliography:There are two challenges in the detection of micro capacitance , firstly, the low precision of measuring cir-cuit leads to the difficulty in recognizing AC small signal;secondly , the signal processing circuit couldn ’ t separate the weak signal from huge noise flow .A detection circuit based on the transimpedance amplifier is presented in the paper , whose detection precision is 1fF/ms.The application of phase sensitive demodulation circuit based on AD 835 and low-pass filter circuit can separate the useful signals from noise flow .The methods overcome the aboved difficulties and ac-complish the extraction of weak signal .
23-1202/TH
weak signal, noise flow, transimpedance amplifier, phase sensitive demodulation
Mu Linfeng, Zhang Wendong, He Changde, Xue Chenyang （1. Key Laboratory of Instrumentation Science ＆ Dynamic Measurement, Ministry of Education, North University of China, Taiyuan 030051, China; 2. Key Laboratory of Science and Technology on Electronic Test ＆ Measurement, North University of China, Taiyu
ISSN:1001-1390