Title :
Automatic tuning of quality factors for VHF CMOS filters
Author :
Nauta, Bram ; Seevinck, Evert
Author_Institution :
Dept. of Electr. Eng, Twente Univ., Enschede, Netherlands
Abstract :
A VHF transconductance-C filter technique with automatic tuning of the quality factors and the cutoff frequency, based on a voltage controlled oscillator (VCO), is presented. The Q-tuning circuit is very simple and contains no signal carrying nodes, resulting in a well-controlled Q up to very high frequencies (100 MHz). A breadboard realization of the Q-tuning circuit gave good results
Keywords :
CMOS integrated circuits; Q-factor; active filters; linear integrated circuits; radiofrequency filters; tuning; 100 MHz; Q-tuning circuit; RF type; VCO; VHF CMOS filters; automatic tuning; cutoff frequency; quality factors; transconductance-C filter; voltage controlled oscillator; Circuit optimization; Cutoff frequency; Filters; Inverters; Q factor; Resistors; Transconductance; Tuning; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 1990., IEEE International Symposium on
Conference_Location :
New Orleans, LA
DOI :
10.1109/ISCAS.1990.112323
