Title :
A new self Q-tuning scheme for biquad OTA-C filters
Author :
Font, J. ; Isern, E. ; Roca, M. ; Picos, R. ; Garcia-Moreno, E.
Author_Institution :
Phys. Dept., Univ. of Balearic Islands, Palma de Mallorca, Spain
Abstract :
A new Q-tuning scheme for biquad OTA-C filters is presented. We have taken benefit of the advantages of the classical Phase-Locked Loop scheme to tune the center frequency and we have also applied it to Q-tuning. The unique requirement for these biquad filters is that fo-tuning and Q-tuning must be uncoupled and independent. Tunability and versatility of OTAs have been fully exploited attaining quality factors with accuracy errors smaller than 1%.
Keywords :
biquadratic filters; operational amplifiers; phase locked loops; biquad OTA-C filters; biquad filters; center frequency; phase-locked loop scheme; self Q-tuning scheme; tunability; versatility; Conferences; Detectors; Phase frequency detector; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Devices, Circuits and Systems (ICCDCS), 2012 8th International Caribbean Conference on
Conference_Location :
Playa del Carmen
Print_ISBN :
978-1-4577-1116-9
Electronic_ISBN :
978-1-4577-1115-2
DOI :
10.1109/ICCDCS.2012.6188926
