Integrating data converters for picoampere currents from electrochemical transducers

Madalina Breten, Torsten Lehmann, Erik Bruun

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    Abstract

    This paper describes a current mode A/D converter designed for a maximum input current range of 5 nA and a resolution of the order of 1 pA. The converter is designed for a potentiostat for amperometric chemical sensors and provides a constant polarization voltage for the measuring electrode. A prototype chip using the dual slope conversion method has been fabricated in a 0.7 μm CMOS process. Experimental results from this converter are reported. Design problems and limitations of the converter are discussed and a new conversion technique providing a larger dynamic range and easy calibration is proposed.
    Original languageEnglish
    Title of host publicationThe 2000 IEEE International Symposium on Circuits and Systems : Proceedings
    Volume5
    Place of PublicationGeneva
    PublisherIEEE
    Publication date2000
    Pages709-712
    ISBN (Print)0-7803-5482-6
    DOIs
    Publication statusPublished - 2000
    EventThe 2000 IEEE International Symposium on Circuits and Systems - Geneva, Switzerland
    Duration: 28 May 200031 May 2000

    Conference

    ConferenceThe 2000 IEEE International Symposium on Circuits and Systems
    CountrySwitzerland
    CityGeneva
    Period28/05/200031/05/2000

    Bibliographical note

    Copyright: 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE

    Cite this

    Breten, M., Lehmann, T., & Bruun, E. (2000). Integrating data converters for picoampere currents from electrochemical transducers. In The 2000 IEEE International Symposium on Circuits and Systems: Proceedings (Vol. 5, pp. 709-712). IEEE. https://doi.org/10.1109/ISCAS.2000.857591