Thermal Memory Effects on the Linearity ofa GaAs PHEMT
2004
This paper presents a comprehensive
treatment of the nonlinear electro-thermal memory
effect arising in a GaAs PHEMT. In particular is
demonstrated the way with which the pure nonlinear
electrical effect and the electro-thermal one combine
and in turn determine a dispersive third-order
intermodulation. The analysis is based on an accurate
distributed model modified in order to take into
account for the dynamic thermal behaviour under
large signal operation. The results show a reduction
of the intermodulation product in response to a
reduction of the two tones frequency spacing, in
agreement with the analytical treatment.
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