Am angledetector based on magnetic sensing

Thomas Kaulberg, Gudmundur Bogason

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    An angledetector with a digital output is described. The component is meant as an alternative to the traditional slide potentiometer used as volume control in many hearing aid applications. The component is based on the use of magnetic sensitive MOSFET's (MAGFET's) detecting the position of a tiny bar magnet placed above a silicon chip. Because of the galvanic separation between the anglesetting bar magnet and the electrical circuit, this component is insensitive to the rather hostile environment hearing aids are exposed to. The lifetime of the component is thereby increased significantly. The electrical circuit contains a switched current A/D-D/A conversion system for offset compensating the MAGFET's and for converting the MAGFET signal currents into a digital output proportional to the input angle. It is implemented using a commercially available 1.5 μm CMOS process
    Original languageEnglish
    Title of host publicationProceedings of the IEEE International Symposium on Circuits and Systems
    VolumeVolume 5
    Publication date1994
    ISBN (Print)07-80-31915-X
    Publication statusPublished - 1994
    Event1994 IEEE International Symposium on Circuits and Systems - London, United Kingdom
    Duration: 30 May 19942 Jun 1994


    Conference1994 IEEE International Symposium on Circuits and Systems
    Country/TerritoryUnited Kingdom
    Internet address

    Bibliographical note

    Copyright: 1994 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


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