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

fYear

2010

fDate

19-22 Dec. 2010

Firstpage

196

Lastpage

199

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microelectronics (ICM), 2010 International Conference on

Conference_Location

Cairo

Print_ISBN

978-1-61284-149-6

Type

conf

DOI

10.1109/ICM.2010.5696114

Filename

5696114