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Accurate GaN HEMT nonquasi‐static large‐signal model including dispersive effects
Author(s) -
Crupi Giovanni,
Raffo Antonio,
Schreurs Dominique M. M.P.,
Avolio Gustavo,
Vadalà Valeria,
Di Falco Sergio,
Caddemi Alina,
Vannini Giorgio
Publication year - 2011
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.25757
Subject(s) - high electron mobility transistor , equivalent circuit , microwave , signal (programming language) , large signal model , transistor , electronic engineering , nonlinear system , small signal model , transistor model , scattering parameters , power (physics) , semiconductor device , materials science , engineering , computer science , electrical engineering , physics , telecommunications , voltage , quantum mechanics , layer (electronics) , composite material , programming language
The purpose of this study is to present an advanced technique for accurately modeling the behavior of a GaN HEMT under realistic working conditions. Since this semiconductor transistor technology has demonstrated to be very well suited for high‐frequency (HF) high‐power applications, an equivalent circuit model is developed to account for the device nonlinearities at microwave frequencies. In particular, the proposed model includes bias dependence of both low‐frequency (LF) dispersive effects affecting GaN devices and HF nonquasi‐static effects, since these two types of frequency dependent phenomena play a crucial role under microwave large‐signal condition. The extraction procedure consists of two main steps. First, an accurate multibias small‐signal nonquasi‐static equivalent circuit is analytically extracted from scattering parameters measured under a wide range of bias points. Thereafter, this linear model is used as a cornerstone for building a nonlinear nonquasi‐static equivalent circuit, which is expanded to account for the LF dispersive phenomena by using an empirical formulation directly identified from the HF large‐signal measurements. The accuracy of the proposed modeling approach is completely and successfully verified by comparing model simulations with LF and HF large‐signal measurements. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:692–697, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25757