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An accurate large-signal model of GaAs MESFET which accounts for charge conservation, dispersion, and self-heating

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3 Author(s)
Ce-Jun Wei ; Alpha Ind. Inc., Woburn, MA, USA ; Tkachenko, Y.A. ; Bartle, D.

A comprehensive large-signal model of a GaAs MESFET is presented to account for charge conservation and effects of dispersion and self-heating. An improved set of capacitance and charge equations, along with an enhanced Triquint Own model (TOM)-like drain current model, is used for consistent small- and large-signal simulations. Charge conservation is satisfied by deriving the capacitance part of the model from charge equations. Transconductance and output conductance dispersion is modeled by combination of a feedback network and a subcircuit, which describes the self-heating effect. An improved description of the near-pinchoff characteristics, high-voltage breakdown, and gain compression in the high-current region in the TOM is introduced. The new model accurately predicts the I-V, CV, bias-dependent S-parameter, waveform, power, and linearity characteristics of the MESFET

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:46 ,  Issue: 11 )

Date of Publication:

Nov 1998

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