A 27.8μW Biopotential Amplifier Tolerant to 30Vpp Common-Mode Interference for Two-Electrode ECG Recording in 0.18μm CMOS

📋 论文概要

本文提出了一种用于双电极心电图记录的生物电位放大器，能够容忍高达30Vpp的共模干扰，解决了无参考电极时电源线耦合导致的巨大共模干扰问题。该放大器采用0.18μm CMOS工艺，功耗仅为27.8μW。

💡 主要创新点

• 提出了一种新型共模干扰抑制技术，使放大器能承受30Vpp的共模输入，远超传统设计。
• 实现了极低功耗（27.8μW）下的高共模容限，适用于便携式双电极ECG设备。

🏷 关键词

📄 原文摘要

Two-electrode ECG devices have gained popularity in the recent past to enable comfortable and long-term monitoring of cardiovascular health. As a ground or bias electrode is not used in a two-electrode ECG device, common-mode interference (CMI) caused by powerline coupling to the human body can be as large as a few tens of volts. Such a large CMI ruins the ECG recording, and thus the analog front-end of the ECG device must be immune to large CMI. The input common-mode range of a front-end amplifier is limited as the input transistors must operate in the saturation region. Although a CM cancellation path can increase the CM range, it is useful only when the CMI is smaller than the supply voltage [1,3]. For large CMI that exceeds the supply rail, the ESD diode is turned on, and the input is saturated to supply or ground. Unfortunately, current state-of-the-art ECG devices available commercially or in research papers do not

👥 作者与机构

Nahmil Koo, SeongHwan Cho

KAIST, Daejeon, Korea