DocumentCode :
3092587
Title :
A C-band GaAs-pHEMT MMIC low phase noise VCO for space applications using a new cyclostationary nonlinear noise model
Author :
Florian, Corrado ; Traverso, Pier Andrea ; Feudale, Marziale ; Filicori, Fabio
Author_Institution :
DEIS - Dept. of Electron., Univ. of Bologna, Bologna, Italy
fYear :
2010
fDate :
23-28 May 2010
Firstpage :
284
Lastpage :
287
Abstract :
This paper describes the design and implementation of a C-band MMIC VCO developed in the framework of activities oriented to the improvement of products for space applications. The circuit exploits a single device with a microstrip integrated resonator coupled with varactors. The exploited technology is a space-qualified GaAs 0.25-um pHEMT process. The MMIC exhibits 350-MHz bandwidth at 7.3 GHz, with 14 dBm output power and -86 dBc/Hz single side-band phase noise at 100 kHz from the carrier. Measured performances are in good agreement with simulations. The active device adopted for the design was characterized in terms of both low-frequency noise in quiescent bias-dependent operation and its up-conversion into phase noise under large-signal RF oscillating conditions, using in-house developed measurement setups. A new compact nonlinear noise model was identified, implemented and exploited for phase noise simulations. The model features cyclostationary equivalent noise generators. Comparisons between measurements and simulations show that the nonlinear cyclostationary modeling approach is more accurate than conventional noise models in oscillator phase noise analyses of pHEMT based circuits.
Keywords :
HEMT integrated circuits; III-V semiconductors; MMIC oscillators; field effect MMIC; gallium arsenide; integrated circuit noise; phase noise; voltage-controlled oscillators; C-band; GaAs; MMIC oscillators; bandwidth 350 MHz; cyclostationary nonlinear noise model; frequency 7.3 GHz; large-signal RF oscillating conditions; microstrip integrated resonator; quiescent bias; single side-band phase noise; size 0.25 mum; voltage-controlled oscillators; Circuit noise; Circuit simulation; Low-frequency noise; MMICs; Noise measurement; PHEMTs; Phase measurement; Phase noise; Space technology; Voltage-controlled oscillators; Voltage controlled oscillator; nonlinear noise model; oscillator phase noise;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Symposium Digest (MTT), 2010 IEEE MTT-S International
Conference_Location :
Anaheim, CA
ISSN :
0149-645X
Print_ISBN :
978-1-4244-6056-4
Electronic_ISBN :
0149-645X
Type :
conf
DOI :
10.1109/MWSYM.2010.5515080
Filename :
5515080
Link To Document :
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