A precise 90° quadrature OTA-C VCO between 50-130 MHz

Author

Linares-Barranco, B. ; Serrano-Gotarredona, T. ; Ramos-Martos, J. ; Ceballos-Cáceres, J. ; Mora, J.M. ; Linares-Barranco, A.

Author_Institution

Inst. de Microelectron. de Sevilla, Spain

Volume

4

fYear

2004

fDate

23-26 May 2004

Abstract

We present a VLSI continuous time sinusoidal OTA-C quadrature oscillator fabricated in a standard double-poly 0.8 μm CMOS process. The oscillator is tunable in the frequency range from 50-130 MHz. A symmetric topology assures that the two phases produced by the oscillator present an extremely low phase difference error (less than 2° over the whole frequency range). A novel current mode amplitude control scheme is developed that allows for very small amplitudes. Experimental results are provided.

Keywords

CMOS integrated circuits; VHF oscillators; VLSI; circuit tuning; continuous time systems; network topology; operational amplifiers; variable-frequency oscillators; voltage-controlled oscillators; 0.8 micron; 50 to 130 MHz; CMOS process; VLSI; circuit tuning; continuous time sinusoidal OTA-C quadrature oscillator; current mode amplitude control scheme; low phase difference error; quadrature OTA-C VCO; symmetric topology; Bridge circuits; Envelope detectors; Frequency measurement; Gain measurement; Impedance measurement; Phase measurement; Signal processing; Soil measurements; Transconductance; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1329060

Filename

1329060