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

Claus Erdmann Fürst

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    Abstract

    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
    PublisherIEEE
    Publication date1996
    Pages477-480
    DOIs
    Publication statusPublished - 1996
    Event1996 IEEE International Symposium on Circuits and Systems - Atlanta, GA, United States
    Duration: 12 May 199615 May 1996
    http://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=3834

    Conference

    Conference1996 IEEE International Symposium on Circuits and Systems
    Country/TerritoryUnited States
    CityAtlanta, GA
    Period12/05/199615/05/1996
    Internet address

    Bibliographical note

    Copyright 1996 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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