基于nA级电流信号的多通道高精度采集系统设计  

Design of Multi-channel High Precision Data Acquisition System Based on nA Level Current Signal

作　　者：闫静纯[1] 富帅[1] 苏浩航[1] 荣鹏[1] 申一伟 YAN Jingchun;FU Shuai;SU Haohang;RONG Peng;SHEN Yiwei(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《红外技术》2021年第5期417-421,共5页Infrared Technology

基　　金：国家重点研发计划项目(2016YFB0500703)。

摘　　要：在大气成份和含量探测的傅里叶变换光谱探测技术中,红外探测器输出的电流信号一般极其微弱。本文针对电流信号频率为kHz级、电流强度在nA级的多元型红外探测器,通过分析系统噪声来源,选取高精度、低噪声的精密集成运算放大器,合理选取电路参数,设计了一种多通道微弱电流信号高精度采集电路。通过对电路性能进行分析,结果表明,该系统可以精确采集到nA级的1 kHz微弱电流信号,系统的噪声低,满足设计要求。In the Fourier transform spectrum detection technology of atmospheric composition and content detection,the output current signal of infrared detector is generally very weak.In this paper,a multi-channel weak current signal high-precision acquisition circuit is designed by analyzing the source of system noise,using high-precision and low-noise integrated operational amplifier,and reasonably selecting circuit parameters.An analysis of the circuit performance shows that the system can accurately acquire the nA level 1kHz current signal,and meet the requirements of weak signal detection.

关 键 词：微弱电流信号 高精度 低噪声 数据采集系统 

分 类 号：TN23[电子电信—物理电子学]