Accurate automatic tuning circuit for bipolar integrated filters

Wim J.A. de Heij, W.J.A. de Heij, Klaas Hoen, Klaas Hoen, Evert Seevinck, E. Seevinck

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    Abstract

    An accurate automatic tuning circuit for tuning the cutoff frequency and Q-factor of high-frequency bipolar filters is presented. The circuit is based on a voltage controlled quadrature oscillator (VCO). The frequency and the RMS (root mean square) amplitude of the oscillator output signal are locked to the frequency and the RMS amplitude of a reference signal, respectively. Special attention is paid to the actual Q-factor in the oscillator. Experimental results for a breadboard circuit operating from 136 to 317 kHz are presented
    Original languageUndefined
    Title of host publicationISCAS'90
    Place of PublicationNew Orleans, USA
    PublisherIEEE
    Pages-
    Number of pages0
    DOIs
    Publication statusPublished - 1 May 1990
    EventIEEE International Symposium on Circuits and Systems, ISCAS 1990 - New Orleans, USA
    Duration: 1 May 19903 May 1990

    Publication series

    Name
    PublisherIEEE
    Volume2

    Conference

    ConferenceIEEE International Symposium on Circuits and Systems, ISCAS 1990
    Period1/05/903/05/90
    Other1-3 May 1990

    Keywords

    • METIS-113918
    • IR-17033

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