A general class of current amplifier-based biquadratic filter circuits

Author

Roberts, Gordon W. ; Sedra, Adel S.

Author_Institution

Dept. of Electr. Eng., McGill Univ., Montreal, Que., Canada

Volume

39

Issue

4

fYear

1992

fDate

4/1/1992 12:00:00 AM

Firstpage

257

Lastpage

263

Abstract

A general class of current amplifier-based biquadratic filter circuits capable of realizing arbitrary filter functions including the low-pass, high-pass, and bandpass transfer functions is presented. These realizations are derived from a class of well-known low sensitivity single amplifier biquadratic (SAB) filter circuits using the principle of adjoint networks. The salient features of the proposed circuits are that they are synthesized using the same procedure as their op-amp-based SAB circuit counterparts, and they possess the same sensitivities to component variations as the original SAB circuits. However, it is demonstrated experimentally that unlike op-amp-based SAB realizations whose effective operating bandwidth is much less than the unity-gain bandwidth of the op-amp, these current-based filter circuits are effective over the entire bandwidth of the current amplifier

Keywords

active filters; band-pass filters; equivalent circuits; high-pass filters; low-pass filters; network synthesis; active type; adjoint networks; bandpass transfer functions; biquadratic filter circuits; current amplifier; high-pass; low-pass; Band pass filters; Bandwidth; Circuit synthesis; Feedback; Frequency response; Network synthesis; Operational amplifiers; Resonance; Transfer functions; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on

Publisher

ieee

ISSN

1057-7122

Type

jour

DOI

10.1109/81.129453

Filename

129453