DocumentCode :
1220482
Title :
Highly selective RC-active filters using mucroer polynomials
Author :
Biey, M. ; Premoli, A.
Author_Institution :
Politecnico di Torino, Istituto di Elettronica e Telecomunicazioni, Torino, Italy
Volume :
1
Issue :
4
fYear :
1977
fDate :
7/1/1977 12:00:00 AM
Firstpage :
155
Lastpage :
158
Abstract :
The complete design of a highly selective bandpass RC-active filter is presented, where special attention is payed to the choice of the approximating function. By using multiple critical route equiripple (mucroer) polynomials, a substantial reduction in maximum Q-factor and variance of the attenuation is obtained. This fact allows the use of biquadratic building blocks with only one operational amplifier (o.a.) in a cascade connection, without the need of multiple-loop feedback techniques. Furthermore, a much smoother group delay is achieved. The price payed for all these advantages is a slight increase in the number of 2ndorder sections to be cascaded. In the realisation, the real-integrator multiple-feedback (r.i.m.f.) section has been employed for its low-cost, easy-tuning, and high-Q capabilities. In the paper, the design and tuning procedure of this block are reported, together with the corresponding experimental results. Finally, a compensation technique of the Q-factor variability with the temperature is described and the experimental curves arc shown
Keywords :
active filters; band-pass filters; polynomials; attenuation; biquadratic building blocks; compensation technique; highly selective bandpass; mucroer polynomials; variance;
fLanguage :
English
Journal_Title :
Electronic Circuits and Systems, IEE Journal on
Publisher :
iet
ISSN :
0308-6984
Type :
jour
DOI :
10.1049/ij-ecs.1977.0022
Filename :
4808459
Link To Document :
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