Mismatch Reduction Techniques for Current-Mirror Based Potentiostats

Markus Haberler*, Inge Siegl, Christoph Steffan, Mario Auer

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Current-mirror based potentiostats suffer from systematic and random errors that mainly appear due to mismatch in the current-mirror. To limit the standard deviation of the error to less than 1.1 % over a dynamic range of four decades, either a high overdrive voltage or comparable big transistor dimensions are required. In this work, an optimized design approach for the current-mirror is presented. Based on the given accuracy and dynamic range requirements, an optimized programmable current-mirror is implemented. An accuracy driven design approach is used to achieve the required accuracy over the wide range of sensor currents, while keeping the area consumption low. Compared to a linearly scaled current-mirror based potentiostat design, an output stage area reduction by a factor of four is achieved. Additionally, the voltage headroom consumption is kept at a minimum. The potentiostat is implemented in a 130 nm CMOS technology and consumes an area of only 0.14 mm 2 . The simulation results show that even in the worst case the specified accuracy is achieved over the complete dynamic range of sensor currents from nA to mA.
Original languageEnglish
Title of host publication2020 43rd International Convention on Information, Communication and Electronic Technology, MIPRO 2020 - Proceedings
EditorsMarko Koricic, Karolj Skala, Zeljka Car, Marina Cicin-Sain, Vlado Sruk, Dejan Skvorc, Slobodan Ribaric, Bojan Jerbic, Stjepan Gros, Boris Vrdoljak, Mladen Mauher, Edvard Tijan, Tihomir Katulic, Predrag Pale, Tihana Galinac Grbac, Nikola Filip Fijan, Adrian Boukalov, Dragan Cisic, Vera Gradisnik
PublisherInstitute of Electrical and Electronics Engineers
Pages99-103
Number of pages5
ISBN (Electronic)978-953-233-099-1
Publication statusPublished - 28 Sep 2020
Event2020 43rd International Convention on Information, Communication and Electronic Technology - Opatija, Hybrider Event, Croatia
Duration: 28 Sep 20202 Oct 2020

Conference

Conference2020 43rd International Convention on Information, Communication and Electronic Technology
Abbreviated titleMIPRO 2020
CountryCroatia
CityHybrider Event
Period28/09/202/10/20

Keywords

  • Current-mirror
  • Dynamic element matching
  • Point-of-care (PoC) diagnostics
  • Potentiostat
  • Wide dynamic range

ASJC Scopus subject areas

  • Computational Mathematics
  • Information Systems
  • Electrical and Electronic Engineering
  • Hardware and Architecture
  • Computer Networks and Communications

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