A 10μA on-chip electrochemical impedance spectroscopy system for wearables/implantables
A-SSCC（2014）
摘要
This work proposes a new time-domain integration method to realize Electrochemical Impedance Spectroscopy (EIS). Unlike traditional EIS systems which use a quadrature sinusoid stimulus, we propose a low-frequency, low-amplitude sinusoid stimulus, which is realized through a sinusoid DAC without the need for analog filter. The error caused by harmonic generation can be suppressed through integration in detection. The response current is sensed by a switched capacitor integrator with control synchronized with sinusoid DAC. The integration output is sampled and digitized by an 8-bit SAR ADC. The (1×1.1)mm2 prototype is fabricated in a 130nm CMOS process. It consumes 10μA from a 1.2V supply.
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关键词
cmos integrated circuits,analogue-digital conversion,digital-analogue conversion,electrochemical impedance spectroscopy,filters,harmonic generation,integrated circuit testing,prosthetics,switched capacitor networks,time-domain analysis,cmos process,eis system,sar adc,analog filter,current 10 mua,implantables,on-chip electrochemical impedance spectroscopy system,quadrature sinusoid stimulus,response current,sinusoid dac,size 1 mm,size 1.1 mm,size 130 nm,switched capacitor integrator,time-domain integration method,voltage 1.2 v,wearables,time-domain integration,capacitors,synchronization,impedance,harmonic analysis
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