Flat magnitude low-pass filters with a pair of imaginary-axis zeros

It is known that the cutoff rate of a maximally flat low-pass filter can be improved either by introducing a pair of imaginary-axis zeros or relaxing the flatness condition. Making use of both techniques simultaneously, this correspondence describes how to design an nth-order low-pass filter with (n...

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Bibliographic Details
Published in:Proceedings of the IEEE 1978-01, Vol.66 (5), p.592-594
Main Authors: Thajchayapong, P., Lomtong, P.
Format: Article
Language:English
Subjects:
Attenuation
Cutoff frequency
Low pass filters
Passband
Poles and zeros
Power engineering and energy
Transfer functions
Online Access:Get full text
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Summary:It is known that the cutoff rate of a maximally flat low-pass filter can be improved either by introducing a pair of imaginary-axis zeros or relaxing the flatness condition. Making use of both techniques simultaneously, this correspondence describes how to design an nth-order low-pass filter with (n - 2) degree of flatness at ω = 0 rad/s and also including a pair of imaginary-axis zeros. Advantageous performances of the filters obtained are also described.
ISSN:0018-9219
DOI:10.1109/PROC.1978.10965