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A 140 dB-CMRR Current-Feedback Instrumentation Amplifier Employing Ping-Pong Auto-Zeroing and Chopping Michiel A. P . Pertijs, Senior Member , IEEE, and Wilko J. Kindt
提出一种结合乒乓自归零和斩波技术的高精度电流反馈仪表放大器，有效消除偏移和低频噪声。
2.8 µV偏移, 140 dB CMRR
仪表放大器电流反馈放大器动态偏移消除斩波自归零
▸创新点1：结合乒乓自归零和斩波技术，通过乒乓自归零输入级与斩波调制协同工作，有效抵消偏移和低频噪声，同时避免传统单一技术带来的输出纹波或噪声增加问题。
▸创新点2：采用慢速偏移归零环路设计，将噪声带宽限制在自归零频率的一半以下，显著降低低频噪声影响，提升系统信噪比。
▸创新点3：通过斩波调制将低频噪声从直流区域移开，降至27 nV/√Hz的白噪声水平，且不引入额外输出纹波，实现高精度信号处理。
▸创新点4：在自归零过程中加入稳定阶段，进一步减少输出瞬态干扰，优化动态性能，确保系统在复杂环境下的稳定性。
Abstract
Senior Member , IEEE, and Wilko J. Kindt
Abstract—This paper presents a precision general-purpose
current-feedback instrumentation amplifier (CFIA) that employs
a combination of ping-pong auto-zeroing and chopping to cancel
its offset and
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noise. A comparison of offset-cancellation
techniques shows that neither chopping nor auto-zeroing is an
ideal solution for general-purpose CFIAs, since chopping results
in output ripple, and auto-zeroing is associated with increased
low-frequency noise. Th