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A large-signal switching MESFET model for intermodulation distortion analysis

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4 Author(s)
Fujii, K. ; Japan Radio Co. Ltd., Tokyo, Japan ; Hara, Y. ; Yakabe, T. ; Yabe, H.

This paper describes an improved large-signal model for predicting an intermodulation distortion (IMD) power characteristic of MESFETs in switching applications. The model is capable of modeling the voltage-dependent drain current and its derivatives, including gate-source and gate-drain capacitors. The drain current and its derivatives are described by a function of a voltage-dependent drain conductance. The model parameters are extracted from a measured drain conductance versus gate voltage characteristic of a MESFET. This paper also presents a new fully symmetric equivalent circuit for switching MESFETs. The IMD power characteristics calculated with the use of the proposed method are compared with experimental data taken from a monolithic microwave integrated circuit single-pole double-throw switch. Good agreements over the large gate voltages and input power levels are observed

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:48 ,  Issue: 3 )

Date of Publication:

Mar 2000

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