Position detection with the use of MAGFETs

Thomas Kaulberg, Gudmundur Bogason

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    An angle detector 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 field sensitive MOSFETs (MAGFETs) detecting the position of a tiny bar magnet placed above a silicon chip. Because of the galvanic separation between the angle setting 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 MAGFETs 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 Instrumentation and Measurement Technology Conference
    Publication date1995
    ISBN (Print)07-80-32615-6
    Publication statusPublished - 1995
    EventIEEE Instrumentation and Measurement Technology Conference: Integrating Intelligent Instrumentation and Control - Waltham, MA, United States
    Duration: 23 Apr 199526 Apr 1995


    ConferenceIEEE Instrumentation and Measurement Technology Conference
    Country/TerritoryUnited States
    CityWaltham, MA
    Internet address

    Bibliographical note

    Copyright: 1995 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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