New approach to the approximation of
            <i>RC</i>
            -active-filter transmission functions with low
            <i>Q</i>
            factor

Premoli, A.; Germano, F.

doi:10.1049/el:19710310

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1976

1984

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Cited by 9 publications

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“…Moreover, the result of conventional filter approximations is often a function with one much higher Q pole-pair than all other pole-pairs.' 2. n-th ORDER APPROXIMATION As argued in the introduction, let high Q conjugate complex pole-pair given by The inequalitiesin ( 5 ) and (7) arise from the nature of our problem. Note that q1 is approximately proportional to the common definition of the pole-pair quality factor Q , namely, where j = J -1.…”

Section: Introductionmentioning

confidence: 99%

Stable high q active networks

Levi

Zeheb²

1976

Circuit Theory & Apps

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A new approach is suggested to approximate the amplitude frequency behaviour of a given high Q poles network function, by an explicit function having poles with a predetermined desired low Q, and with explicit knowledge and control of the error. The method is practical for reducing Q's by the ratio of up to 6. Any critical pole-pair is replaced by an approximating function possessing a complex conjugate n-th order pole-pair and a ( n -1)-th order zero-pair. A general second order low Q building block is derived as an example. Measured results proving the practical usefulness of the method, are reported.

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Section: Introductionmentioning

confidence: 99%