Abstract
A new small-signal equivalent circuit for HEMTs and MESFETs is proposed based on ac measurements. Instead of a pure output conductance gds in conventional equivalent-circuit models, an output admittance Yds=Gds+jB is introduced. The delay time τ in the conventional models can be interpreted physically. Using the model, simulated S-parameters agree well with the measured ones in the frequency range from 45 MHz to 40 GHz for HEMTs. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 375–378, 2001.
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