The Design of High-Q Sallen-Key Biquads with Unity-Gain Buffer Amplifiers.

Hans Gaunholt, Birthe Guldbrandsen

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    Abstract

    In the design of active biquads with negative feedback frequently referred to as Sallen-Key networks the assumption of a low quality- or Q-factor is recommended in order to keep the active sensitivities at a reasonable low value. In this paper it will be shown that it is possible to design and to implement the Sallen- Key biquad even in the high-Q case with reasonable sensitivities. The method is based on the unity gain version of the biquad and as unity gain buffer amplifiers are readily manufactured in integrated circuit technology the results may be very useful in the fabrication of integrated analog filters in voltage-mode as well as current-mode technology. As an example we will choose the band-pass biquad as biquads of this type often has to be designed with high-Q values. The results in the band-pass case may readily be transferred to the low-pass and high-pass cases.
    Original languageEnglish
    JournalInternational Journal of Circuit Theory & Applications
    Volume25
    Issue number4
    Pages (from-to)307-316
    ISSN0098-9886
    Publication statusPublished - 1997

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