Abstract

A new method for characterization of HEMT distortion parameters, which extracts the coefficents of Taylor series expansion of Ids(Vgs,Vds), including all crossterms, from low-frequency harmonic measurements, has been developed. The extracted parameters will be used either in a Volterra series model around a fixed bias point for third order characterization of small-signal Ids nonlinearity, and in a large-signal model of Ids characteristic, where its partial derivatives have been locally characterized up to the third order in the whole bias region, using a novel neural network representation. The two models have been verified by harmonic measurements on a AMS HEMT at 5 GHz.