A 92-dB-DR 126-µV sensitivity potentiometric sensor interface with high interference robustness

Markus Haberler, Christoph Steffan, Inge Siegl, Norbert Sailer, Mario Auer

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


A fully differential potentiometric sensor interface consisting of a high input impedance programmable-gain preamplification stage followed by a delta-sigma (∆Σ) ADC is presented. The reconfigurable circuit achieves a dynamic range of 92 dB and a resolution of 126 µV, thus enabling electrochemical analyses for multiple biochemical parameters. The fully differential topology of the signal acquisition chain in combination with the use of feedforward compensated opamps leads to a high interference robustness of the implementation. Compared to a single-ended topology, PSRR, CMRR and EMIRR improvements by 43.3 dB, 6.8 dB and 21.6 dB, respectively, are achieved. These properties and the low power and area consumption of 75 µW and 0.081 mm 2 allow the circuit to be used in wirelessly powered electrochemical point-of-care (PoC) diagnostics.

Original languageEnglish
Title of host publication2021 IEEE International Symposium on Circuits and Systems, ISCAS 2021 - Proceedings
PublisherIEEE Publications
Number of pages5
ISBN (Electronic)9781728192017
Publication statusPublished - 28 May 2021
Event53rd IEEE International Symposium on Circuits and Systems: ISCAS 2021 - Daegu, Korea, Republic of
Duration: 22 May 202128 May 2021

Publication series

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


Conference53rd IEEE International Symposium on Circuits and Systems
Country/TerritoryKorea, Republic of


  • Interference
  • Dynamic range
  • Robustness
  • Topology
  • Impedance
  • Feedforward systems
  • Signal resolution
  • Programmable-gain amplifier (PGA)
  • Wireless power transfer (WPT)
  • Delta-sigma (∆Σ) ADC
  • Potentiometry
  • Interference robustness
  • Frequency compensation
  • Biosensor
  • Feedforward

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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