A 22.6µW Biopotential Amplifier with Adaptive Common-Mode Interference Cancelation Achieving Total-CMRR of 104dB and CMI Tolerance of 15Vpp in 0.18µm CMOS

📋 论文概要

本文提出一种22.6µW的生物电位放大器，采用自适应共模干扰消除技术，解决了双电极心电图记录中因电极阻抗不匹配导致的共模转差模干扰以及电源饱和问题，实现了104dB的总共模抑制比。

💡 主要创新点

• 提出自适应共模干扰消除电路，实时抑制因电极阻抗失配引起的共模到差模转换。
• 在极低功耗（22.6µW）下实现高达104dB的总共模抑制比，显著提升双电极ECG记录可靠性。

🏷 关键词

📄 原文摘要

Korea Aerospace Research Institute, Daejeon, Korea 1 2 Improving robustness to common-mode interference (CMI) is imperative for reliable two-electrode ECG recording. CMI degrades the signal quality in two ways. First, it appears as a differential-mode signal together with the ECG, because of common-mode to differential-mode (CM-DM) conversion. This is often due to the electrode impedance mismatch [1], as contacts inevitably lose their properties differently during long-term recording. Second, CMI that exceeds the supply voltage saturates the amplifier and distorts the recording when the subject is near power lines [4]. To address both of these issues, the recoding IC must withstand large CMI and also have a large total-CMRR (TCMRR) that includes the effect of electrode mismatch. Unfortunately, prior works provide solutions to only one of them, and thus there is a lack of reliable long-term ECG recording

👥 作者与机构

Nahmil Koo1, Hyojun Kim2, SeongHwan Cho1

KAIST, Daejeon, Korea