A Power-efficient Bidirectional Potentiostat-based Readout IC for Wide-range Electrochemical Sensing

Jui Hsiang Tsai, Yi Chia Chen, Yu-Te Liao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

This paper presents a low-power electrochemical sensor readout IC with a bi-directional potentiostat for accommodating a large dynamic sensing current range. The proposed chopper stabilization potentiostat, suppressing low-frequency noise at the front end and providing stable positive and negative potentials between the working and reference electrodes for bi-directional current sensing through a switched push-pull readout stage. The digital implementation of an oscillator-based current to frequency converter and frequency counter transforms the sensing current directly into digital codes. The design is realized in a 0.18μm CMOS process and occupies an area of 1.3mm2, including all passive components and pads. The proposed readout IC achieves a 0.9pA minimum detectable current in a current range of ± 18μA, an R2 linearity of 0.999, and a dynamic detectable current range of 152dB. The static power consumption of the proposed readout IC is 2.9μW from a 1.5V supply.

Original languageEnglish
Title of host publication2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538648810
DOIs
StatePublished - 26 Apr 2018
Event2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Florence, Italy
Duration: 27 May 201830 May 2018

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2018-May
ISSN (Print)0271-4310

Conference

Conference2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
CountryItaly
CityFlorence
Period27/05/1830/05/18

Keywords

  • chopper stabilization
  • large dynamic range
  • low-power design
  • potentiostat

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