Low-noise active-RC allpole filters using optimized biquads

Translated title of the contribution: Low-noise active-RC allpole filters using optimized biquads

Dražen Jurišić, George S. Moschytz, Neven Mijat

    Research output: Contribution to journalArticlepeer-review

    3 Scopus citations


    In this paper it is shown that active-RC filters can be designed to have low-sensitivity to passive components and at the same time possess low output thermal noise. The design procedure of low-noise and low-sensitivity, positive-feedback, second- and third-order low-pass allpole filters, using impedance tapering, has already been published. The noise analysis in this paper was extended to the high-pass and band-pass filters and those with negative-feedback. The optimum designs, regarding both noise and sensitivity of most useful filter sections were summarized in the table form (as a cookbook) and demonstrated on examples. The classical methods were used to determine output noise spectral density and total rms output noise of filters. It was found that low-sensitivity filters with minimum noise have reduced resistance levels, low Q-factors, low-noise operational amplifiers and use impedance tapering design.

    Translated title of the contributionLow-noise active-RC allpole filters using optimized biquads
    Original languageEnglish
    Pages (from-to)361-373
    Number of pages13
    Issue number4
    StatePublished - 2010


    • Allpole filters
    • And band-pass active-rc filters
    • High-
    • Low noise
    • Low sensitivity
    • Low-
    • Single-amplifier biquads


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