An area efficient low noise 100 Hz low-pass filter

Christian Ølgaard, Haoues Sassene, Ivan R. Perch-Nielsen

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    Abstract

    A technique based on scaling a filter's capacitor currents to improve the noise performance of low frequency continuous-time filters is presented. Two 100 Hz low-pass filters have been implemented: a traditional low pass filter (as reference), and a filter utilizing the above mentioned current scaling technique. The two filters utilize approximately the same silicon area. The scaled filter implements the scaling by use of a MOS based current conveyor type CCII. Measurements indicate that the current scaled filter results in a noise improvement of approximately 5.5 dB over the reference filter when a class A/B biasing scheme is used in the current divider. Obtaining identical noise performance from the reference filter would require a 3.6 times larger filter capacitor. This would increase the reference filter's die area by 100%. Therefore, the current scaling technique allows filters with improved noise performance/dynamic range, given a fixed silicon area and a fixed power supply
    Original languageEnglish
    Title of host publicationProceedings of the IEEE International Symposium on Circuits and Systems
    VolumeVolume 1
    PublisherIEEE
    Publication date1996
    ISBN (Print)07-80-33073-0
    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

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