The fact that most of these topologies need laser-trimming technique to improve the match precision to reach high CMRR is found after investigating several instrumentation amplifier topologies.

• 本文研究了几种常用仪表放大器电路结构,发现多需通过激光调阻技术来提高电阻网络的匹配精度以达到高的共模抑制比。