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Frequency‐dependent OP‐AMP gain influence on parameters of the single amplifier biquad filters
Author(s) -
Reljin Branimir D.
Publication year - 1980
Publication title -
international journal of circuit theory and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.364
H-Index - 52
eISSN - 1097-007X
pISSN - 0098-9886
DOI - 10.1002/cta.4490080102
Subject(s) - digital biquad filter , operational amplifier , gain–bandwidth product , control theory (sociology) , amplifier , current feedback operational amplifier , fully differential amplifier , direct coupled amplifier , filter (signal processing) , mathematics , low pass filter , bandwidth (computing) , physics , electronic engineering , computer science , engineering , electrical engineering , telecommunications , control (management) , artificial intelligence
Abstract The influence of the finite gain and gain‐bandwidth product of the operational amplifier on the parameters of the active RC filter has been investigated in the present paper. Single amplifier biquad filters were analysed for the case when the central frequency in the pole pair does not depend on the amplifier gain, i.e. when S k ω p= 0. The general results were obtained for such filters, describing well the filter behaviour at low as well as at high frequencies. On the basis of the results obtained, the deviation of the realized parameters from the desired values can be determined, and thereby the necessary correction of the filter calculation can be made. The experimental results agree well with the theoretical ones.