Title :
A 5.3 GHz phase shift tuned I/Q LC oscillator with 1.1 GHz tuning range
Author :
van der Tang, Johan ; Van Roermund, Arthur
Author_Institution :
Eindhoven Univ. of Technol., Netherlands
Abstract :
In this paper phase shift tuning of a 5.3 GHz quadrature LC oscillator is investigated. By varying the phase shift of the circuits that couple two LC oscillator stages, a 1.1 GHz tuning range is achieved. Dependency of tuning range and phase noise on the quality factor of the LC resonators is explored on the behavioral level. Expressions are given for the tuning range and an effective quality factor, as a function of the resonator quality, its phase shift and its resonance frequency. The oscillator is realized in a mainstream 30 GHz fT BiCMOS process and dissipates 45 mW (nominal) with 2.7 V supply voltage. The dependency of the tuning range on the resonator quality is measured by varying the quality factor of a varactor incorporated in the LC resonators of the I/Q oscillator. Measured L(2 MHz) is -108 dBc/Hz at 5.6 GHz.
Keywords :
BiCMOS analogue integrated circuits; Q-factor; circuit tuning; phase noise; phase shifters; radiofrequency oscillators; 2.7 V; 45 mW; 5.3 GHz; BiCMOS process; I/Q oscillator; LC resonator; phase noise; phase shift tuning; quadrature LC oscillator; quality factor; resonant frequency; tuning range; varactor; BiCMOS integrated circuits; Circuit optimization; Coupling circuits; Phase noise; Q factor; Q measurement; Resonance; Resonant frequency; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2003 IEEE
Print_ISBN :
0-7803-7694-3
DOI :
10.1109/RFIC.2003.1214030