用于可穿戴健康监测的带电流匹配和共模抑制回路的生物阻抗传感接口集成电路

IF 2.2 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Sensors Letters Pub Date : 2024-09-10 DOI:10.1109/LSENS.2024.3457614

Risheng Su;Longbin Zhu;Wenjie Wang;Yang Zhou;Jianan Zheng;Zhengtao Zhu;Fan Luo;Siyuan Xie;Jihong Li;Zhijun Zhou;Fanyi Meng;Keping Wang

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引用次数: 0

摘要

这封信介绍了一种生物阻抗（Bio-Z）传感接口集成电路，它具有电流匹配和共模抑制（CMCS）环路，适用于长期健康监测应用。CMCS 回路消除了电流发生器（CG）源和汇刺激电流之间的不匹配，同时将 CG 的面积减小了一半。此外，CMCS 回路还重新利用了 Bio-Z 仪表放大器的共模反馈回路，从而大幅提高了接口的共模抑制比 (CMRR)，同时降低了功耗和面积开销。拟议的 Bio-Z 接口采用 130 纳米 CMOS 技术设计。通过采用 CMCS 回路，该接口的 CMRR 达到 127 dB，输入参考阻抗噪声为 3.84-mΩ/√Hz，占地面积为 0.07 mm2，读出前端的功耗为 10.4 µW，CG 的功耗为 12.9-122.7 µW。

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A Bioimpedance Sensing Interface IC With Current Matching and Common-Mode Suppressing Loop for Wearable Health Monitoring

This letter presents a bioimpedance (Bio-Z) sensing interface IC with a current matching and common-mode suppressing (CMCS) loop for long-term health monitoring applications. The CMCS loop eliminates the mismatch between the source and sink stimulation currents of the current generator (CG), while reducing the area of the CG by half. Furthermore, the CMCS loop reuses the common-mode feedback loop of the Bio-Z instrumentation amplifier to substantially enhance the common-mode rejection ratio (CMRR) of the interface with reduced power consumption and area overhead. The proposed Bio-Z interface is designed in 130-nm CMOS technology. By employing the CMCS loop, it achieves a CMRR of 127 dB, exhibits a 3.84-mΩ/√Hz input-referred impedance noise, occupies an area of 0.07 mm ² , and consumes a power of 10.4 µW for the readout front end and 12.9–122.7 µW for the CG.

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来源期刊

IEEE Sensors Letters Engineering-Electrical and Electronic Engineering

CiteScore

3.50

自引率

7.10%

发文量

194