Title :
Integrated continuous-time filter using averaging-detectors in the tuning circuit
Author :
Ajjikuttira, Aruna ; Stromsmoe, K.A. ; Filanovsky, I.M.
Author_Institution :
Dept. of Electr. Eng., Alberta Univ., Edmonton, Alta., Canada
Abstract :
A 20-kHz continuous-time low-pass filter with amplitude-detection tuning realized in a standard 3-micron CMOS process is described. A simple seven-transistor averaging-type amplitude detector circuit is used in the tuning scheme. Its advantages over a similar scheme using precision rectifiers as amplitude detectors is given. The tuning circuit maintains the filter cutoff frequency to better than 1% of the designed value as the temperature was varied from 0° to 70°C
Keywords :
CMOS integrated circuits; active filters; detector circuits; tuning; 0 to 70 degC; 3.0 micron; CMOS process; amplitude-detection tuning; averaging-detectors; continuous-time low-pass filter; filter cutoff frequency; precision rectifiers; tuning circuit; Active filters; CMOS process; Circuit optimization; Detectors; Frequency; Low pass filters; Prototypes; Rectifiers; Temperature; Voltage;
Conference_Titel :
Circuits and Systems, 1990., Proceedings of the 33rd Midwest Symposium on
Conference_Location :
Calgary, Alta.
Print_ISBN :
0-7803-0081-5
DOI :
10.1109/MWSCAS.1990.140758
