101. a sub-1 uw multiparameter injectable biomote for continuous alcohol monitoring

Department: Electrical & Computer Engineering
Faculty Advisor(s): Drew A. Hall

Primary Student
Name: Haowei Jiang
Email: haj019@ucsd.edu
Phone: 858-249-9840
Grad Year: 2019

Student Collaborators
xiahan zhou, xiz250@eng.ucsd.edu

We present a wireless, fully-integrated, miniature "BioMote" sensor node that can be injected through a 16-gauge syringe for continuous, long-term alcohol monitoring. A microelectrode electrochemical sensor array that measures alcohol, background, and pH was implemented to differentially measure ethanol while removing interference and motion artifacts. The low-power multi-technique potentiostat supports both amperometric and potentiometric techniques achieving 2.5 nA sensitivity with 30.1 dB dynamic range and 0.5 mV sensitivity with 43 dB dynamic range, respectively. The measurements are transmitted to a wearable device through backscatter using a self-oscillating current-to-frequency (I-to-F) converter. The system is wirelessly powered via the coupling between an on-chip 4-turn coil and a wearable device at 985 MHz. The self-contained 0.851.5 mm2 chip is implemented in 65 nm CMOS and consumes 970 nW.

Industry Application Area(s)
Electronics/Photonics | Life Sciences/Medical Devices & Instruments | Semiconductor

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