In this paper, an alternative description of the small- to
large-signal intermodulation distortion (IMD) evolution
in PHEMT amplifiers is presented. The influence of the
device derivatives on the nulls of the in-band distortion
components of the channel current, and the origin of the
linearity sweet spots are evaluated using the timedependence
of the drain to source current third order
derivatives as a novel technique for IMD null
prediction
