摘要
微弱小信号采集在电子设计和数据采集中尤为重要,要有效处理小信号必须进行放大,但放大小信号的同时会将干扰放大并引起误差。为有效解决小信号放大中干扰和失调误差,文中在仔细研究小信号特性的基础上,提出采用精密仪表放大器和自归零技术对微弱信号放大,精密仪表放大器实现更高的共模抑制比,自归零技术减少失调误差,两者相结合可实现微弱信号稳定有效放大110倍。测试结果:在TINA-TI下进行仿真,可对毫伏级的信号稳定放大到几伏,并有效抑制干扰和失调误差。该设计具有一定的实用和参考价值,对研究小信号放大链路提供了一种新思路和设计方法。
It is very important to sample small signal in electronic design and data acquisition. The small signal must be amplified for application,but at the same time noise is also amplified and may cause tolerance. This paper carefully researches small signal characters,adopts precision instrument amplifier and auto-zeroing technique to amplify weak signal. The precision instrument amplifier can achieve high common mode rejection ratio,auto-zeroing technique can reduce disturbance error. both use can effective amplify small signal upto 110 times. Simulation was completed under TINA-TI,the test result showed that an input signal with m V level can be amplified to V level,and could effectively resist interference and disturbance error. This design has practical and reference values,it provides a new idea and design method for small signal amplification chain research.
出处
《实验室研究与探索》
CAS
北大核心
2016年第10期143-146,共4页
Research and Exploration In Laboratory
基金
西京学院院科研基金项目资助(XJ120115)
关键词
小信号
仪表放大器
自归零技术
共模抑制比
small signal
instrument operational amplifier
auto-zeroing technique
CMRR
