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Universal biquad filter topology using low‐voltage current mirrors
Author(s) -
Laoudias Costas,
Psychalinos Costas
Publication year - 2012
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.706
Subject(s) - digital biquad filter , topology (electrical circuits) , transfer function , capacitor , filter (signal processing) , band pass filter , electronic filter topology , computer science , active filter , electronic engineering , voltage , low pass filter , high pass filter , engineering , electrical engineering
SUMMARY A single input multiple output biquad filter topology realized using current mirrors as active elements is introduced in this manuscript. The proposed topology simultaneously realizes all the standard transfer functions of a biquad filter without modifying its structure. Some attractive characteristics offered by the proposed topology are the employment of only grounded capacitors as passive elements, the electronic adjustment of the resonant frequency, and the capability for operation under a low‐voltage environment. The operation of the proposed topology has been validated through simulation results, where the most important performance factors have been evaluated in the case of a bandpass filter transfer function. Copyright © 2010 John Wiley & Sons, Ltd.