微伏级直流电压信号放大电路设计  

Design of amplifying circuit for microvolt-level DC voltage signal

作　　者：闫岩[1] 行鸿彦[2] YAN Yan;XING Hongyan(Collaborative Center on Forecast & Evaluation of Meteorological Disasters,Nanjing University of Information Science & Technology,Nanjing 210044,China;Jiangsu Technology & Engineering Center of Meteorological Sensor Network,Nanjing University of Information Science & Technology,Nanjing 210044,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心,江苏南京210044 [2]南京信息工程大学江苏省气象传感网技术工程中心,江苏南京210044

出　　处：《现代电子技术》2017年第14期149-153,157,共6页Modern Electronics Technique

基　　金：国家自然科学基金(61072133);江苏省产学研联合创新资金计划(BY2013007-02);江苏省高校自然科学研究重大项目(15KJA460008);江苏省"六大人才高峰"计划和江苏省"信息与通信工程"优势学科资助

摘　　要：针对微伏级直流电压信号测量过程中存在信噪比低、测量精度不高和抗干扰能力差的问题,设计一种以TLC2652为核心器件的放大测量电路,实现了对5~45μV范围内电压信号的精准放大。电路采用低通滤波电路、陷波电路降低内部噪声与外部干扰;采用隔离电路,隔离测量端对采集端的影响;采用线性稳压芯片进行电源模块的设计,提高测量精度并降低功耗。经仿真实验验证,说明所设计的微伏级直流电压信号放大电路具有抑制共模干扰、抑制温漂、稳定性好、抗干扰性强等特点,测量精度达到0.044%。In view of the facts that the low signal-to-noise ratio,poor anti-interference ability and low measurement accuracy exist in the measuring process of microvolt-level DC voltage signal,an amplifying measurement circuit taking TLC2652as itscore device is proposed in this paper to realize precision amplification of voltage signals(5~45μV).The low-pass filtering cir-cuit and band-stop circuit are adopted to reduce its internal noise and external interference.The isolation circuit is adopted toisolate the effect of the measuring end on the collection end.The linear regulating chip is used in power module design to improve the measurement accuracy and reduce power consumption.The simulation experiment result proves that the amplifyingmeasurement circuit for microvolt-level DC voltage signal can suppress common mode interference and temperature drifting,hasgood stability and strong anti-interference,and its accuracy can reach to0.044%.

关 键 词：信号放大电路 放大测量电路 低通滤波电路 影响隔离 

分 类 号：TN721.5-34[电子电信—电路与系统] TM930[电气工程—电力电子与电力传动]