An area efficient low noise 100 Hz low-pass filter

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

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    522 Downloads (Pure)


    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
    Publication date1996
    ISBN (Print)07-80-33073-0
    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

    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.


    Dive into the research topics of 'An area efficient low noise 100 Hz low-pass filter'. Together they form a unique fingerprint.

    Cite this