Large-signal frequency responses of 2nd-order filters containing multiple amplifiers

Author

Al-Kabbani, A.S.S. ; Bowron, P.

Author_Institution

United Arab Emirates University, College of Engineering, Al-Ain, United Arab Emirates

Volume

134

Issue

5

fYear

1987

fDate

10/1/1987 12:00:00 AM

Firstpage

229

Lastpage

235

Abstract

The describing-function technique is extended to predict the large-signal performance of active filters containing any number of operational amplifiers. This is achieved by generalising the theory of active filters whose amplifiers are each represented by a dominant pole and a saturation nonlinearity. As examples, the jump-resonance amplitude and phase characteristics of several popular 3-amplifier 2nd-order bandpass filter circuits are then evaluated and compared. The conditional-stability problem appears to be more severe than for single- and double-amplifier filters.

Keywords

active filters; band-pass filters; feedback; frequency response; network analysis; operational amplifiers; transfer functions; 2nd-order filters; active filters; bandpass filter circuits; conditional-stability problem; describing-function technique; dominant pole; feedback; frequency responses; jump-resonance amplitude; large-signal performance; multiple amplifiers; operational amplifiers; phase characteristics; saturation nonlinearity;

fLanguage

English

Journal_Title

Electronic Circuits and Systems, IEE Proceedings G

Publisher

iet

ISSN

0143-7089

Type

jour

DOI

10.1049/ip-g-1:19870034

Filename

4647132