High-efficiency class E/F3 power amplifiers with extended maximum operating frequency

This paper presents high-efficiency class-E/F-3 power amplifiers with extended maximum operating frequency (f(max)) using a novel method of a transmission-line compensation circuit (TLCC). Theoretical analysis is presented in order to obtain circuit component values, which compensate the excess output capacitance C-x and satisfy the required impedances of the class-E/F-3 power amplifiers at the fundamental frequency and harmonics. The proposed circuit, whose f(max) is 4 times higher than the conventional structure, has been designed, fabricated, and measured. Besides, high-performance results with the output power of 40.3 dBm, drain efficiency of 82.9% have been achieved.