A power-efficient, bi-directional readout interface circuit for cyclic-voltammetry electrochemical sensors

Yi Chia Chen, Shao Yung Lu, Jui Hsiang Tsai, Yu Te Liao

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

Abstract

This paper presents an electrochemical sensing front-end circuit with a cyclic voltammetry potentiostat. To accommodate a large and bidirectional current sensing range for the current-mirror based potentiostat, a constant offset current is added. With the technique of chopper-stabilization, the flicker noise of the readout circuit is successfully reduced. A charge-based oscillator is also proposed in this paper to convert the current into a frequency for further data readout. The proposed readout IC was fabricated in a 0.18μm, 1.2V CMOS process and the current range is -2μA 12.2μA, the R2 linearity of 0.992, with a minimum detectable current of 3.1nA. The dynamic current range is 73.2dB whereas the chip consumes 40.5μW at a maximum sensing current of 12.2μA.

Original languageEnglish
Title of host publication2019 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728106557
DOIs
StatePublished - Apr 2019
Event2019 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2019 - Hsinchu, Taiwan
Duration: 22 Apr 201925 Apr 2019

Publication series

Name2019 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2019

Conference

Conference2019 International Symposium on VLSI Design, Automation and Test, VLSI-DAT 2019
CountryTaiwan
CityHsinchu
Period22/04/1925/04/19

Keywords

  • Chopper stabilization
  • CMOS
  • Cyclic Voltammetry
  • Large dynamic range
  • Potentiostat

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