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 | |
| Format | Journal Article |
| Language | Chinese |
| Published |
郑州轻工业学院 电气信息工程学院,河南 郑州,450002
2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 2095-476X |
| DOI | 10.3969/j.issn.2095-476X.2015.3/4.026 |
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| Abstract | 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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| AbstractList | TP216; 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。 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. |
| Abstract_FL | 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 am-plifier circuit based on modulation and demodulation principle.The simulation analysis showed that the cir-cuit had higher noise suppression capability and stability and could meet the weak current measurement re-quirement of various sensors. |
| Author | 姜利英 岳保磊 梁茂 周鹏磊 肖小楠 |
| AuthorAffiliation | 郑州轻工业学院电气信息工程学院,河南郑州450002 |
| AuthorAffiliation_xml | – name: 郑州轻工业学院 电气信息工程学院,河南 郑州,450002 |
| Author_FL | ZHOU Peng-lei YUE Bao-lei LIANG Mao JIANG Li-ying XIAO Xiao-nan |
| Author_FL_xml | – sequence: 1 fullname: JIANG Li-ying – sequence: 2 fullname: YUE Bao-lei – sequence: 3 fullname: LIANG Mao – sequence: 4 fullname: ZHOU Peng-lei – sequence: 5 fullname: XIAO Xiao-nan |
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| Keywords | 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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| Notes | 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 |
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| SubjectTerms | T型I/V转换 低噪声 前置放大 微弱电流 锁相放大 |
| Title | 一种改进型微弱电流低噪声放大应用电路 |
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