2 . the input stages of the ccii and the operational amplifier in transimpedance implifier are realized with folded cascode amplifier to reach high cmrr , large open loop gain and low offset 2 .為了提高儀表放大器的電源抑制比,并得到大的開(kāi)環(huán)增益,相對(duì)低的失調(diào)等性能,電流傳輸器的輸入級(jí)和跨阻放大器中運(yùn)算放大器輸入級(jí)均采用折疊共源共柵放大器。