Low active-sensitivity allpole active-RC filters using impedance tapering

Draźen Jurišić, George S. Moschytz, Neven Mijat

Research output: Contribution to journalConference articlepeer-review


To reduce the low-power allpole active-RC filter's output magnitude sensitivity to passive components, the "impedance tapering" design method was used. This design procedure has been applied to the design of 2 nd- and 3rd-order low-pass (LP) (class 4) Sallen-and-Key filters and has already been published. In this paper the active sensitivity analysis using MATHEMATICA was performed on the same "impedance tapered" filter sections as in [1]. The analysis was performed by calculation of the real filter's transfer-function magnitude which was denormalized to various cut-off frequencies from low to high, using a single-pole model of a real operational amplifier. The amount of active and passive sensitivity reduction was compared using the same degree of impedance tapering. It was demonstrated that both sensitivities, i.e. active and passive, were correspondingly reduced for the same filter. Thus, a judicious selection of component values accounts for a considerable decrease in both passive and active sensitivities.

Original languageEnglish
Pages (from-to)I89-I92
JournalProceedings - IEEE International Symposium on Circuits and Systems
StatePublished - 2004
Externally publishedYes
Event2004 IEEE International Symposium on Cirquits and Systems - Proceedings - Vancouver, BC, Canada
Duration: 23 May 200426 May 2004


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