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

Volume

23

Issue

3

fYear

1988

fDate

6/1/1988 12:00:00 AM

Firstpage

784

Lastpage

793

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;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.319

Filename

319