Multiphase sinusoidal oscillator using the CFOA pole

Author

Wu, D.-S. ; Liu, S.-I. ; Hwang, Y.-S. ; Wu, Y.-P.

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

Volume

142

Issue

1

fYear

1995

fDate

2/1/1995 12:00:00 AM

Firstpage

37

Lastpage

40

Abstract

A multiphase sinusoidal oscillator using the parasitic poles of current feedback operational amplifiers (CFOAs) is presented. The oscillator can generate n signals which are equal in amplitude and equally spaced in phase. The oscillator using the parasitic poles of CFOAs is suitable for high frequency applications and monolithic IC fabrication. The effects caused by the nonlinearity of the CFOA on the oscillation frequency and condition have been analysed. Experimental results show that a three-phase sinusoidal oscillator has a wide operating range from 10 kHz to 10 MHz and a large output voltage swing up to 7 V peak to peak while using ±5 V power supply. The total harmonic distortion (THD) of each oscillation frequency is dominated by its third harmonic component which is at least 33 dB down from its fundamental

Keywords

feedback amplifiers; monolithic integrated circuits; nonlinear network analysis; operational amplifiers; oscillators; poles and zeros; 10 kHz to 10 MHz; 5 V; 7 V; current feedback operational amplifiers; high frequency applications; monolithic IC fabrication; multiphase sinusoidal oscillator; nonlinearity; oscillation frequency; parasitic poles; third harmonic component; three-phase sinusoidal oscillator; total harmonic distortion;

fLanguage

English

Journal_Title

Circuits, Devices and Systems, IEE Proceedings -

Publisher

iet

ISSN

1350-2409

Type

jour

DOI

10.1049/ip-cds:19951682

Filename

365546