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A 130-dB CMRR Instrumentation Amplifier With Common-Mode Replication Sanfeng Zhan
提出一种共模复制技术，实现130dB CMRR和50GΩ输入共模阻抗的仪表放大器。
130dB CMRR, 50GΩ输入共模阻抗, 1.86μA@1.8V, 0.227mm²
仪表放大器共模抑制比共模复制高阻抗低功耗
▸共模复制技术（CM-REP）消除共模电流及其失配效应
▸同时提升CMRR和输入共模阻抗
▸针对输入共模范围和寄生效应的实用技术
Abstract
High common-mode rejection ratio (CMRR) of
an analog front end (AFE) requires high intrinsic CMRR of
the front-end amplifier with high input common-mode (CM)
impedance. This article presents a common-mode replication
(CM-REP) technique, which replicates the input CM voltage
over the front-end amplifier. By eliminating the CM current flow
and its mismatch effect, CM-REP improves CMRR and input
CM impedance simultaneously. Implementation considerations
regarding the input CM range, on-chip, and off-c