Current-Mode CMOS A/D Converter for pA to nA Input Currents

Madalina Breten, Torsten Lehmann, Erik Bruun

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


    This paper describes a current mode A/D converter designed for a maximum input current range of 5nA and a resolution of the order of 1pA. 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 0.7micron 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 publicationProc. 17th NORCHIP Conference
    Place of PublicationCopenhagen
    Publication date1999
    Publication statusPublished - 1999
    Event17th NORCHIP Conference - Oslo, Norway
    Duration: 8 Nov 19999 Nov 1999
    Conference number: 17


    Conference17th NORCHIP Conference

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