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A novel drain current I-V model for MESFET

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3 Author(s)
Ban-Leong Ooi ; Electr. & Comput. Eng. Dept., Nat. Univ. of Singapore, Singapore ; Ma, J.Y. ; Leong, M.S.

The conventional approach for modeling the dc I-V characteristics of a MESFET transistor usually adopts the hyperbolic tangent dependence on Vds. On the contrary, our new empirical model describes the device drain current as a polynomial of effective gate-source voltage Veff. The derived model is capable of accurately modelling the subthreshold effect and the device current-voltage behavior at different operating regions, in particular, the device operation around the pinchoff region. Measured and modeled results of a 0.5-μm gatelength MESFET device are compared and good agreement has been obtained. Comparisons between the proposed model, Curtice model, Chalmers model, and Parker model are also made in this paper. In addition, a single-stage class-AB amplifier was built with a commercial high-power MESFET transistor to verify the new model

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:50 ,  Issue: 4 )

Date of Publication:

Apr 2002

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