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本文提出一种用于大规模压阻传感器阵列的快速阻抗测量IC，采用统一差分时域解调架构，通过激励电路直接读出阻抗，并利用预饱和自适应偏置技术提高能效。该芯片在125kHz下扫描253个传感器仅需12.2ms（82fps），功耗158μW，实现了0.5%误差和71.1dB SNR。
Abstract This paper presents a fast impedance-measurement IC for large-scale piezo-resistive sensor arrays. It features a unified differential time-to-digital demodulation architecture that reads out impedance directly through the excitation circuit. A pre-saturation adaptive bias technique further improves power efficiency. The chip scans 253 sensors in 12.2ms (82fps) at 125kHz, consuming 158μW (7.5nJ/sensor). With loads from 20$ to 500k$, it achieves 0.5% error and up to 71.1dB SNR. Frailty increases sharply with age and is the major cause of falls, leading to severe injury and fatality. While fall risks can be effectively predicted using gait analysis, it is often limited in laboratory settings. Piezo-resistive crossbar sensor arrays (Fig. 36.11.1 (top)) can be used towards lab-grade, yet wearable insoles. However, several challenges remain: 1) high sensor density (>250 per insole); 2) high temporal resolution required (50 to 100 frames
Jiayang Li1,2, Qingyu Zhang2, Sohmyung Ha2,3, Andreas Demosthenous2, Dai Jiang2, Yu Wu2
University of Bristol, Bristol, United Kingdom, 2University College London, London, United Kingdom, 3New York University Abu Dhabi, Abu Dhabi, United Arab Emirates