Realizability constraints for third-order impedance-tapered allpole filters

G. S. Moschytz

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


It is shown that allpole filters of second- and third-order can be significantly desensitized to component tolerances by so-called impedance tapering, i.e., successively impedance-scaling upwards the L-sections of a resistance-capacitance ladder network in the forward and feedback path of a single-amplifier active filter. In order to obtain a realizable filter, certain constraints on the design equations must be observed. These constraints are derived here, and the resulting conditions necessary for the design of realizable third-order impedance tapered allpole filters are given.

Original languageEnglish
Pages (from-to)1073-1077
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing
Issue number8
StatePublished - 1999
Externally publishedYes


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