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本文提出了一款无电池无线电化学接口SoC，采用自适应性逐步下沉技术和频率-数字混合结构，实现了143dB的动态范围和0.99997的高线性度，功耗仅23.3μW，适用于多模态可穿戴生理监测。
Abstract A battery-free wireless electrochemical-interface SoC is implemented and demonstrated in a sweatband prototype for physiological monitoring in body sweat, where the proposed techniques improve the dynamic range with a high linearity and low power consumption: 1) A self-adaptive stepwise-sinking technique for an OTA-less potentiostat extends the dynamic range to 143dB with 23.3μW power. 2) A frequency-digital-hybrid structure helps to ensure a high linearity of R2=0.99997 across the 143dB range. Electrochemical sensors can be used to detect various physiological parameters on the human body, such as glucose, lactate, alcohol, uric acid, etc. Due to the low fabrication cost, electrochemical sensors are potentially widely-adopted in disposable wearables, e.g. contact lenses [1], wristbands [2], bandages [3], and various patches [4,5]. However, various substances on the body surface require different types of electrochemical sensors,
Weixiao Wang, Yili Shen, Tianyi Cai, Qijing Xiao, Yuxuan Luo, Bo Zhao
Zhejiang University, Hangzhou, China