a nw-level wireless ion sensing system

Department: Electrical & Computer Engineering
Research Institute Affiliation: Center for Wearable Sensors
Faculty Advisor(s): Patrick P. Mercier | Joseph Wang

Primary Student
Name: Xiaoyang Wang
Email: xiw271@ucsd.edu
Phone: 858-228-7614
Grad Year: 2020

This paper presents a battery-connected wireless ion sensing system comprising a Na+-selective electrode, a 406 pW potentiometric front end, a 780 pW reference-free asynchronous SAR ADC, a 2.4 GHz power oscillator-based transmitter that consumes 2.4 nW when transmitting 100 bps, a 485 pW quiescent power 1.8-to-0.6 V switched-capacitor DC-DC converter with 96.8% peak efficiency, and two temperature-stabilized relaxation oscillators that serve as clocks for the DC-DC converter, ADC, and power gating switches, consuming 140 pW each. The system was tested in-vitro, where measurement results exhibit a linear, near-Nertian response to varying Na+ concentration with a slope of 71 mV/Log10[Na+]. The system is aimed to be small and ultra-low power so that it can be seamlessly integrated into daily life and minimize re-changing times.

Industry Application Area(s)
Electronics/Photonics | Internet, Networking, Systems | Life Sciences/Medical Devices & Instruments

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