A 2.4 GHz CMOS quadrature LC-oscillator/mixer

Author

Oliveira, Luís Bica ; Fernandes, Jorge R. ; Filanovsky, I.M. ; Verhoeven, C.J.M.

Author_Institution

I.S. Tecnico, Lisboa, Portugal

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

Coupled LC oscillators are very often used to achieve quadrature outputs. In this paper we present an expression for the oscillation frequency of a coupled oscillator considering the effect of mismatches. Then we calculate the new value of the resonator effective Q due to varying of the oscillation frequency, and we evaluate the correspondent phase noise degradation. We show that this degradation is critical for high quality factor inductors. We evaluate the capability of a coupled LC oscillator to perform the mixing function by inserting a signal in the oscillator feedback structure. The theoretical results are confirmed by simulation.

Keywords

CMOS integrated circuits; mixers (circuits); oscillators; phase noise; resonators; 2.4 GHz; CMOS; coupled LC oscillators; mismatches effects; mixing function; oscillation frequency; oscillator feedback; phase noise; quadrature LC-mixer; quadrature LC-oscillator; quadrature outputs; quality factor inductors; Degradation; Feedback; Inductors; Liquid crystal on silicon; Performance evaluation; Phase noise; Q factor; RF signals; Resonant frequency; Ring 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.2004.1328157

Filename

1328157