Nonlinear modeling of compound semiconductor HEMTs state of the art

This paper will review the state-of-the-art for modeling compound semiconductor HFETs and HEMTs for microwave power applications. Some simple physics shows why SPICE models, or compact models, cannot contain all aspects of the device operation. Because the models are incomplete, any given model may always be improved and thus, modifiable user-defined compact models are preferred. In particular, Verilog-A coded models are shown to have many desirable features. Minimum modeling requirements for accurate system and circuit simulation are described, as well as present modeling techniques.