A 0.5mΩ/√Hz 106dB SNR 0.45cm2 Dry-Electrode Bioimpedance Interface with Current Mismatch Cancellation and Boosted Input Impedance of 100MΩ at 50kHz

📋 论文概要

本文提出了一种用于干电极的生物阻抗接口芯片，通过电流失配消除和输入增强技术，实现了0.5mΩ/√Hz的低噪声和106dB的高信噪比，面积仅0.45cm²，适用于可穿戴健康监测中的阻抗心动图应用。

💡 主要创新点

• 提出电流失配消除技术，有效抑制干电极接口中的非理想效应，提升测量精度。
• 采用输入增强架构，在保持低噪声的同时提高信号动态范围，实现106dB SNR。

🏷 关键词

📄 原文摘要

Bioimpedance (BioZ) analysis has been recognized as a new paradigm to derive a number of body composition and hemodynamic measures in a non-invasive manner. Measuring the changes in electrical resistance of the thorax during a cardiac cycle, known as impedance cardiography (ICG), is beneficial in detecting early signs of heart failure deterioration [1]. This raises the need for power-efficient wearable BioZ sensors to enable long-term and user-friendly health monitoring, while state-of-the-art designs still suffer from a few drawbacks. First, conventional BioZ interfaces typically rely on gel electrodes (>10cm2) for low-impedance contact between skin and electrodes [1-2]. This not only hampers the long-term recording but also causes user discomfort. However, it is very challenging to perform small-size dry-electrode BioZ sensing at the frequency range of 1kHz to 1MHz, where both the increased electrode-tissue impedance (ETI)

👥 作者与机构

Qinjing Pan, Tianxiang Qu, Biao Tang, Fei Shan, Zhiliang Hong, Jiawei Xu

Fudan University, Shanghai, China