Effect of Collector Current and Voltage Profiles on the Efficiency of Transistor Microwave Power Amplifiers of Class F(H) With Parametric Effects Taken Into Account

摘要

In the theory of class F(H) transistor microwave amplifiers, the problem of the mechanism of an effect that results in an increase in amplifier efficiency up to 80-90/100 still remains open. The papers [1, 2] deal with the study of the dependence of amplifier efficiency on the collector current and/or voltage profiles. However, there was no attempt to find current and voltage profiles that ensure maximum efficiency. It was shown in [1] that for certain phase relations between collector current harmonics the parametric effects related to nonlinear capacitance of the collector transition allow one to increase the amplifier efficiency by a factor of 1.1-1.2.