Power-efficient cyclic voltammetric electrochemical sensing readout circuitry with current-reducer ramp waveform generation

Yi Chia Chen, Shao Yung Lu, Yu-Te Liao

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

Abstract

This paper presents an electrochemical sensing chip with an integrated current-reducer pattern generator and a low-noise chopper-stabilization potentiostat circuit. The pattern generator, utilizing the current reducer technique and pseudo resistors, creates a sub-Hz ramp signal for the cyclic voltammetric measurement without large-size passive components. The proposed design adopts a chopper-stabilization potentiostat and time-based converter to reduce the amplitude noise effects. The design is fabricated using a 0.18-μm CMOS process and achieves a 41pA current resolution in the current range of ± 5μA while maintaining the R2 linearity of 0.998. The power consumption of the design is 16μW when a 5μA sensing current is detected. The power efficiency of the readout interface is 0.31 and the sensing current dynamic range is 108dB. The design is fully integrated into a single chip.

Original languageEnglish
Title of host publication2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728103976
DOIs
StatePublished - 1 Jan 2019
Event2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019 - Sapporo, Japan
Duration: 26 May 201929 May 2019

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2019-May
ISSN (Print)0271-4310

Conference

Conference2019 IEEE International Symposium on Circuits and Systems, ISCAS 2019
CountryJapan
CitySapporo
Period26/05/1929/05/19

Keywords

  • Electrochemical sensing
  • Leakage-based ramp generator
  • Low power
  • Power-efficient

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