An Improved Empirical Large-Signal Model for the GaAs- and GaN-Based HEMTs
A complete empirical large-signal model for the GaAs-and GaN-based HEMTs is presented. Three generalized drain current I-V models characterized by the multi-bias Pulsed I-V measurements are presented along with their dependence on temperature and quiescent bias state. The new I-V equations dedicated for different modeling cases are kept accurate enough to the higher-order derivatives of drain-current. Besides, an improved charge-conservative gate charge Q-V formulation is proposed to extract and model the nonlinear gate capacitances. The composite nonlinear model is shown to accurately predict the S-parameters, large-signal power performances as well as the two-tone intermodulation distortion products for various types of GaAs and GaN HEMTs. (C) 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE 21:343-352, 2011.
large-signal model hemt equivalent-circuit parameter extraction