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A 26.6–119.3-µW 101.9-dB SNR Direct Digitization Bio-Impedance Readout IC Tan-Tan Zhang
一种高功率噪声效率的直接数字化生物阻抗读出IC，采用ΔΣ调制和反馈电流导向DAC技术。
101.9-dB SNR, 4-Hz带宽, 0.1-Hz 1/f噪声角, 152.6-dB FoM
生物阻抗直接数字化ΔΣ调制动态元件匹配电流平衡仪表放大器
▸基于ΔΣ调制的生物阻抗读出拓扑结构
▸反馈电流导向DAC减少残余电流
▸动态元件匹配技术降低1/f噪声和开关噪声
Abstract
This article presents a direct digitization bio- impedance (BioZ) readout IC with high power-to-noise efficiency over a wide input impedance range. This design features a delta- sigma (16)-based BioZ readout topology with the first-order noise shaping and a feedback current-steering digital-to-analog converter (IDAC) that minimizes the residual current to sup- press the input-dependent noise modulation in current bal- ancing instrumentation amplifier (CBIA). Furthermore, various dynamic element matching (DEM) techniques are applied to mit- igate the impact of 1/ f noise and switching noise during analog to digital conversion. The proposed BioZ readout circuit was implemented in a standard 40-nm CMOS process. Measurement results showed 101.9-dB SNR within 4-Hz bandwidth with lower than 0.1-Hz 1/ f noise corner and 152.6-dB figure-of-merit (FoM) for I path.