Active all-pass filter using a differential-input operational amplifier

1 January 1969

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in Proceedings of the IEEE

Vol. 57 (9) , 1687-1688
https://doi.org/10.1109/PROC.1969.7376

Abstract

Horowitz's active RC synthesis procedure with a voltage controlled current source is combined with Sheingold's realization of the active element using a differential-input operational amplifier to derive a circuit for an all-pass filter of any arbitrary order, having poles confined to the negative real axis only. Illustrative examples are worked out for the first- and second-order cases.

Keywords

ACTIVE FILTERS
DIFFERENTIAL AMPLIFIERS
OPERATIONAL AMPLIFIERS
TRANSFER FUNCTIONS
CIRCUIT SYNTHESIS
NETWORK SYNTHESIS
RADIO CONTROL
VOLTAGE CONTROL
POLES AND ZEROS
IMPEDANCE

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