Title :
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
fDate :
5/1/2002 12:00:00 AM
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;
Journal_Title :
Solid-State Circuits, IEEE Journal of
