Switched Current Micropower 4th Order Lowpass / Highpass Filter

Gudmundur Bogason

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    This paper describes a 4th order lowpass / highpass Butterworth filter implemented in switched current technique. The filter has been designed for low power operation. A prototype implementation has been made and it operates with supply voltages down to 2V and with a total supply current of 211¿A at a sampling rate of 50kHz. The chip includes a clock-generator, three current-followers, sample-and-hold and two 4th order filters. The sampling frequency is restricted to approximately 50kHz and the ratio between sampling frequency and cutoff frequency is 12.5. The dynamic-range was found to be 49dB for the highpass section and 58dB for the lowpass section, with a peak signal current of 750nA. The area of the chip core is 1.33mm2.
    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

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