A fully integrated continuous-time 1Hz low-pass filter with high dynamic range and low distortion

Peter Jivan Shah

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    A first order 1Hz integrated filter needing no external components is described. It uses an on-chip capacitor of 100pF and a new differential transconductance amplifier which allows direct implementation of very small transconductances by using MOS transistors in their triode region. This furthermore makes the filter cutoff frequency electrically adjustable. The distortion is very low, less than 0.1% at 4Vpp input voltage. Also the signal-to-noise ratio is good, more than 80dB at 0.1% distortion. This is remarkable because the well-known high 1/f-noise level of MOS transistors is particularly severe at the very low frequencies of interest here.
    Original languageEnglish
    Title of host publicationProceedings of the Nineteenth European Solid-State Circuits Conference
    VolumeVolume 1
    Publication date1993
    ISBN (Print)28-63-35134-X
    Publication statusPublished - 1993
    Event19th European Solid-State Circuits Conference - Sevilla, Spain
    Duration: 22 Sep 199324 Sep 1993
    Conference number: 19


    Conference19th European Solid-State Circuits Conference
    Internet address

    Bibliographical note

    Copyright: 1993 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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