A low-noise/low-power preamplifier for capacitive microphones

Claus Erdmann Fürst

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    A design for a microphone preamplifier for application in hearing aids is presented. The amplifier operates at a supply of 1-1.5 V, the current drain is 40 μA. The maximum sound level allowed is more than 120 dB SPL (Sound Pressure Level), with a typical noise level of 25 dB(A) SPL (A-weighted). The amplifier is optimized for a capacitive microphone with a capacitance of 1.2 pF. The amplifier is fully integrated in a 0.7 μm n-well CMOS technology. Design details concerning noise performance are analytically described
    Original languageEnglish
    Title of host publicationProceedings of the IEEE International Symposium on Circuits and Systems : Connecting the World
    Place of PublicationPiscataway
    Publication date1996
    Publication statusPublished - 1996
    Event1996 IEEE International Symposium on Circuits and Systems - Atlanta, GA, United States
    Duration: 12 May 199615 May 1996


    Conference1996 IEEE International Symposium on Circuits and Systems
    Country/TerritoryUnited States
    CityAtlanta, GA
    Internet address

    Bibliographical note

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