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A 136-G Input-Impedance Active Electrode for Non-Contact Biopotential Signals Mo
一种136GΩ输入阻抗的有源电极电路，用于非接触式生物电位信号检测。
136GΩ@60Hz, 19.5fF, 700mVpp, 0.72µVrms, 10.46µW@1.2V
超高输入阻抗有源电极非接触检测生物电位信号寄生电容消除
▸采用自动校准正反馈环路消除片上寄生电容
▸结合SAR辅助PFL校准的电容降尺度技术实现飞法级分辨率
▸采用虚拟输入结构和主动屏蔽技术消除PCB板外寄生电容
Abstract
This article describes an ultra-high input-
impedance active electrode (AE) circuit and the system to sense
biopotential signals through a capacitively coupled interface.
Various techniques from both circuit and system aspects are used
to eliminate the input parasitic capacitance of the AE. On-chip
parasitic capacitance is compensated by an auto-calibrated
positive feedback loop (PFL) without applying any reference
signal. A capacitor down-scaling technique combined with SAR-
assisted PFL calibr