Title :
A continuous analysis of the oscillation amplitude in MOS LC-VCOs
Author :
Fahs, Bassem ; Gamand, Patrice ; Berland, Corinne
Author_Institution :
CRISMAT, Univ. de Caen, Caen, France
Abstract :
In this paper, a closed-form expression for oscillation amplitude in source-tailed MOS LC-VCOs versus the oscillator bias current and LC-tank resistive losses is proposed. The developed analysis is based on the utilization of analog saturation functions to provide a continuous equation among the oscillator´s current-limited and voltage-limited regimes, which takes also into account the oscillation start-up condition. Quantitative predictions from the derived equation are in good agreement with Spectre simulations results from a 0.25-μm technology LC-VCO circuit. This expression can be used in an equation-based algorithm serving to control the amplitude and to optimize the phase noise versus frequency setting in switched-resonator based LC-VCOs.
Keywords :
MIS devices; phase noise; voltage-controlled oscillators; LC-VCO circuit; LC-tank resistive losses; amplitude control; analog saturation functions; closed-form expression; continuous analysis; continuous equation; developed analysis; equation-based algorithm serving; frequency setting; oscillation amplitude; oscillation start-up condition; oscillator bias current; oscillator current-limited regime; oscillator voltage-limited regimes; phase noise; source-tailed MOS LC-VCO; spectre simulations; switched-resonator based LC-VCO; Equations; Irrigation; Loss measurement; Noise; Radio access networks; Resonant frequency; Switches; Amplitude control; LC-VCOs; MOS; phase noise;
Conference_Titel :
Microelectronics (ICM), 2010 International Conference on
Conference_Location :
Cairo
Print_ISBN :
978-1-61284-149-6
DOI :
10.1109/ICM.2010.5696114
