Abstract
The behavioral model of class E amplifiers in the steady state are given via the modified nodal analysis (MNA) formulation. The MNA formulation that provides circuit equations is adopted in general-purpose circuit simulators such as SPICE. Even though the circuit configuration is changed，the circuit equations are easily obtained. Hence, the behavioral model can be certainly obtained without difficulty in the setting up of the circuit equations. To produce the behavioral model, the MOSFET included in the class E amplifier is replaced with an ideal switch. Each dynamical system that depends on the "on" and "off" states of the switch is categorized as a descriptor system in control theory. The behavioral model of the class E amplifiers is obtained, on the basis of control theory. The proposed method is applicable to behavioral modeling of other types of resonant power amplifiers.
