Novel approach to a consistent large-signal and small-signal modeling of power PHEMTs

A new method is presented to address the Gm and Gds dispersion in large-signal power PHEMT modeling. Instead of using a single DC current source or two current sources for DC and RF respectively, three 4-D sources as functions of Vdo, Vgo, Vgs, and Vds, are introduced to model DC current, RF Gm and RF Gds independently. A model constructed based on the new approach shows consistency in predicting large-signal performance and small-signal S-parameter response over a wide bias range. The model is verified by comparing the modeled DC, RF Gm and RF Gds, bias-dependent S-parameter, power performance as well as device port waveforms at power driving condition.