A Bio-Impedance Readout IC with Digital-Assisted Baseline Cancellation for 2-Electrode Measurement

📋 论文概要

该论文提出一种用于2电极测量的生物阻抗读数IC，采用数字辅助基线取消技术，有效降低了低频噪声。与常规方法相比，噪声密度从310 nV/√Hz降至98 nV/√Hz，积分噪声从619 nVrms降至198 nVrms。

💡 主要创新点

• 提出数字辅助基线取消技术，在2电极生物阻抗测量中实现大幅噪声降低。
• 通过在第一级仪表放大器中减去大基线，允许使用更高增益配置。

🏷 关键词

📄 原文摘要

KU Leuven, Heverlee, Belgium Figure 22.5.3 compares the measured noise performance with and without baseline cancellation. All noise numbers are measured by applying a current to a known resistor and taking the digital output to include all noise sources (CG, RFE, IDAC and ADC). A noise density at 1Hz and an integrated noise (0.1 to 4Hz) have been reduced from 310 to 98nV/√Hz and 619 to 198nVRMS, respectively (with the largest input for the conventional CBIA (25mVPK)). Furthermore, since the large baseline is subtracted in the first TC stage, the CBIA can be configured to the largest gain (160V/V) relaxing the ADC noise requirement over the whole extended input range (<125mVPK). In the conventional case [2], the IA gain must be reduced to accommodate a large input resulting in noise fluctuation when gain changes (Fig. 22.5.3). Recent advances in wearables allow for monitoring the health status of users

👥 作者与机构

imec - Netherlands, Eindhoven, The Netherlands

imec, Heverlee, Belgium