DocumentCode
938340
Title
Generalised maximally flat approximation
Author
Barros, M.de P. ; Lind, L.F.
Author_Institution
University of Essex, Department of Electronic Systems Engineering, Colchester, UK
Volume
134
Issue
5
fYear
1987
fDate
10/1/1987 12:00:00 AM
Firstpage
225
Lastpage
228
Abstract
An analytical method to generalise the classical Butterworth approximation into a maximally flat approximation function possessing finite and asymmetric transmission zeros is presented. The passband of this general function is no longer restricted to the usual ¿ 3 dB at ±1 rad/s coordinates, and therefore extremely asymmetric characteristics can be generated, such as those required by pseudohighpass or pseudolowpass filters. The final network realisation can be conveniently absorbed into narrowband crystal filter design techniques. Two examples are given.
Keywords
approximation theory; crystal resonators; high-pass filters; linear network synthesis; low-pass filters; lumped parameter networks; passive filters; asymmetric characteristics; classical Butterworth approximation; design techniques; lumped passive filters; maximally flat approximation function; narrowband crystal filter;
fLanguage
English
Journal_Title
Electronic Circuits and Systems, IEE Proceedings G
Publisher
iet
ISSN
0143-7089
Type
jour
DOI
10.1049/ip-g-1:19870033
Filename
4647128
Link To Document