期刊
IEEE JOURNAL OF SOLID-STATE CIRCUITS
卷 53, 期 11, 页码 3126-3139出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2018.2869569
关键词
Analog-to-digital converter (ADC); biofuel cell (BFC); biosensor; delta-sigma modulator; glucose; lactate; passive filter; self-powered; switched capacitor (SC); wearables
资金
- UC San Diego Center for Wearable Sensors
- Arnold and Mabel Beckman Foundation
- National Institute of Biomedical Imaging and Bioengineering of NIH [R21EB019698]
This paper presents a self-powered wireless physiochemical sensing system for monitoring of glucose or lactate in bodily fluids. The biosensor chip consists of a duty-cycled biofuel cell (BFC) maximum power point tracker analog front end, a passive Delta Sigma analog-to-digital converter (ADC), an RF power oscillator transmitter using a 1-cm external loop antenna, digital data storage, and timing and clock generation circuitries, all designed to operate from the dynamic 0.3-V BFC output voltage. The biosensor chip, implemented in 65-nm CMOS and exclusively powered via an enzymatic BFC, can successfully detect changes in glucose/lactate concentration between 2.5 and 15 mM, for the first demonstration of an integrated self-powered chemical biosensing system with digital wireless readout. The biosensor consumes an average power of 1.15 mu W.
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