Analysis and design of an optimally coupled 5-GHz quadrature LC oscillator

Author

van der Tang, Johan ; Van de Ven, Pepijn ; Kasperkovitz, Dieter ; Van Roermund, Arthur

Author_Institution

Mixed-Signal Microelectron. Group, Eindhoven Univ. of Technol., Netherlands

Volume

37

Issue

5

fYear

2002

fDate

5/1/2002 12:00:00 AM

Firstpage

657

Lastpage

661

Abstract

A 5-GHz quadrature LC oscillator has been realized, in which the two LC stages are coupled with phase shifters. Analysis on the behavioral level shows that an N-stage LC oscillator is optimally coupled when each stage is connected with phase shifters providing ±180°/N phase shift. Simulation of the 5-GHz two-stage quadrature LC oscillator reveals a 4.3-dB reduction in phase noise compared to a quadrature LC oscillator without phase shifters. Measurements of the 5-GHz quadrature LC oscillator, made in a 30-GHz f _T process, show a phase noise lower than -113 dBc/Hz, with a resonator quality factor of only 4 and an oscillator core power dissipation of 21.2 mW

Keywords

Q-factor; circuit optimisation; coupled circuits; oscillators; phase noise; phase shifters; 21.2 mW; 5 GHz; coupling optimisation; phase noise; phase shifter; power dissipation; quadrature LC oscillator; quality factor; Circuits; Frequency; Optical receivers; Optical resonators; Optical transmitters; Phase locked loops; Phase noise; Phase shifters; Ring oscillators; Transceivers;

fLanguage

English

Journal_Title

Solid-State Circuits, IEEE Journal of

Publisher

ieee

ISSN

0018-9200

Type

jour

DOI

10.1109/4.997861

Filename

997861