Maximum efficiency and output of class-F power amplifiers

A class-F power amplifier (PA) improves efficiency and power-output capabil ity (over that of class A) by using selected harmonics to shape its drain-v oltage and drain-current waveforms, Typically, one waveform (e,g,, voltage) approximates a square wave, while the other (e,g,, current) approximates a half sine wave, The output power and efficiency of an ideal class-F PA can be related to the Fourier coefficients of the waveforms, and Fourier coeff icients for maximally flat waveforms have been determined. This paper exten ds that theory by determining the coefficients for the maximum power and ef ficiency possible in a class-F PA with a given set of controlled harmonics.