A Fully Conservative Nonlinear Empirical Model of the Microwave FET

The paper proposes a closed-form empirical MESFET model incorporating exact charge and energy conservation constraints. Charge storage in the intrinsic device is described in terms of an energy fuunction explicitly depending on gate and drain voltages, from which the capacitance coefficients and the displacement currents are generated by differentiation. It is shown that this simultaneously ensures the full physical consistency of the model in large-signal operation, and makes the parameter extraction process neater and better defined. In particular, the extraction naturally suggests a well conditioned and accurate model for the voltage-dependent channel delay.