Title :
Design and implementation of a CMOS VCXO for FM stereo decoders
Author :
Qiuting, Huang ; Sansen, Willy M C ; Steyaert, Michiel S J ; Van Peteghem, Peter M.
Author_Institution :
Dept. Elektrotechniek, Katholieke Univ. Leuven, Heverlee, Belgium
fDate :
6/1/1988 12:00:00 AM
Abstract :
A circuit technique to simulate large variable capacitance of both positive and negative polarities over a given frequency range is discussed. The simulated capacitance can be varied by voltage control from -60 to +100 pF. The capacitor-simulating circuit is connected in parallel with a resonator to tune its parallel resonance. An oscillator with grounded resonator is also developed. Together with the variable capacitor, a voltage-controlled crystal oscillator (VCXO) is realized. The oscillation frequency of the oscillator can be tuned continuously from 452 to 461 kHz by voltage control. Detailed analyses to completely characterize the oscillator with a simple expression are presented. The prototype of the VCXO has been fabricated in a 4- mu m standard CMOS process.<>
Keywords :
CMOS integrated circuits; crystal resonators; demodulators; frequency modulation; radiofrequency oscillators; variable-frequency oscillators; -60 to 100 pF; 4 micron; 4 micron standard CMOS process; 452 to 461 kHz; CMOS VCXO; FM stereo decoders; RF type; capacitor-simulating circuit; grounded resonator; parallel connection; parallel resonance; resonator; simulated capacitance; variable capacitance; voltage control; voltage-controlled crystal oscillator; Capacitance; Capacitors; Circuit simulation; Decoding; Frequency; RLC circuits; Resonance; Tuned circuits; Voltage control; Voltage-controlled oscillators;
Journal_Title :
Solid-State Circuits, IEEE Journal of
