Accurate pHEMT nonlinear modeling in the presence of low-frequency dispersive effects

Raffo, Antonio ; Santarelli, Alberto ; Traverso, Pier Andrea ; Vannini, Giorgio ; Palomba, Francesco ; Scappaviva, Francesco ; Pagani, Maurizio ; Filicori, Fabio (2005) Accurate pHEMT nonlinear modeling in the presence of low-frequency dispersive effects. IEEE Transactions on Microwave Theory and Techniques, 53 (11). pp. 3449-3459. ISSN 0018-9480
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Abstract

Low-frequency (LF) dispersive phenomena due to device self-heating and/or the presence of "traps" (i.e., surface state densities and bulk spurious energy levels) must be taken into account in the large-signal dynamic modeling of III-V field-effect transistors when accurate performance predictions are pursued, since these effects cause important deviations between direct current (dc) and dynamic drain current characteristics. In this paper, a new model for the accurate characterization of these phenomena above their cutoff frequencies is presented, which is able to fully exploit, in the identification phase, large-signal current-voltage (I-V) measurements carried out under quasi-sinusoidal regime using a recently proposed setup. Detailed experimental results for model validation under LF small- and large-signal operating conditions are provided. Furthermore, the I-V model proposed has been embedded into a microwave large-signal pseudomorphic high electron-mobility transistor (pHEMT) model in order to point out the strong influence of LF modeling on the degree of accuracy achievable under millimeter-wave nonlinear operation. Large-signal experimental validation at microwave frequencies is provided for the model proposed, by showing the excellent intermodulation distortion (IMD) predictions obtained with different loads despite the very low power level of IMD products involved. Details on the millimeter-wave IMD measurement setup are also provided. Finally, IMD measurements and simulations on a Ka-band highly linear power amplifier, designed by Ericsson using the Triquint GaAs 0.25-/spl mu/m pHEMT process, are shown for further model validation.

Abstract
Document type
Article
Creators
CreatorsAffiliationORCID
Raffo, Antonio
Santarelli, Alberto
Traverso, Pier Andrea
Vannini, Giorgio
Palomba, Francesco
Scappaviva, Francesco
Pagani, Maurizio
Filicori, Fabio
Keywords
field-effect transistors (FETs), nonlinear circuits, nonlinear distortion, III-V semiconductors, MMIC power amplifiers, circuit simulation, dispersive media, gallium arsenide, high electron mobility transistors, intermodulation distortion, microwave field effect transistors, millimetre wave measurement, semiconductor device models
Subjects
ISSN
0018-9480
DOI
Deposit date
28 Mar 2006
Last modified
31 Oct 2012 11:37
URI

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