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在生物电信号的采集放大过程中，电极电位常可引起不易察觉的干扰和信号畸变，影响正常波形的判断识别。主要影响机制为：放大器前级部分阻塞、“高频斩波”式干扰、分布电容变化干扰及电极引线漏电噪声。作者提出电极电位抵消和前级高频预滤波电路，并结合前级隔离、驱动屏蔽技术应用于放大器的前级设计，可大大提高放大器对电极电位的耐受能力，基本消除电极电位的影响。
In the process of collecting and amplifying bioelectric signals, the electrode potential often causes imperceptible interference and signal distortion, which affects the judgment and recognition of normal waveforms. The main impact of the mechanism: the amplifier part of the obstruction, “high-frequency chopping” interference, changes in distribution of capacitance and electrode lead leakage noise. The authors propose the electrode potential cancellation and the pre-stage high-frequency prefiltering circuit. Combined with the pre-isolation and driving shielding technology applied to the pre-amplifier design, the amplifier can greatly enhance the electrode’s tolerance to the amplifier and basically eliminate the influence of the electrode potential.