A Radio-Frequency Tunable Active Filter

Allen Taflove, Morris E. Brodwin

Research output: Contribution to journalArticlepeer-review


A design approach for a tunable active filter of constant bandwidth and center-frequency gain is described. The approach is based on a feedback configuration with a complex pole pair in the forward transfer function, and a complex zero pair in the feedback transfer function. Center frequency tuning is achieved with the variation of only one element, a potentiomenter, which controls the feedback loop gain. A circuit realization using two commercial video amplifiers with RC embedding is presented. A tuning range of 25 percent at 5 MHz, with a nominal bandwidth of 90 kHz or 180 kHz, and a variation of center-frequency gain of less than ±1 dB over the tuning range, is obtained.

Original languageEnglish (US)
Pages (from-to)73-76
Number of pages4
JournalIEEE Journal of Solid-State Circuits
Issue number2
StatePublished - 1974

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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