A 1.74.12 mm3 Fully Integrated pH Sensor for Implantable Applications using Differential Sensing and Drift-Compensation
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Date
2019
Publication Type
Other Conference Item
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yes
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Abstract
This paper presents a 1.7×4.1×2 mm3 pH sensor that is a fully integrated, stand-alone and implantable system. Instead of a bulky cm size Ag/AgCl electrode, we use a mm-size integrated platinum electrode, and differential sensing using ISFET and REFET pair to compensate for unstable fluid potential. We also propose a drift compensation technique in which the leakage from the source and drain through the gate oxide is canceled, reducing drift >100×.
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published
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Book title
2019 Symposium on VLSI Circuits
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Publisher
IEEE
Event
33rd Symposium on VLSI Circuits
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Software
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Subject
Sensors; Electrodes; Calibration; Logic gates; Electric potential; Fluids; Platinum
Organisational unit
09647 - Jang, Taekwang / Jang, Taekwang