High efficiency power amplification for microwave and millimeter frequencies

Abstract
A novel technique for realizing high-efficiency operation of power amplifiers at microwave frequencies is demonstrated. This approach features third-harmonic-peaking Class-F amplifier operation. A novel third-harmonic-peaking circuit using drain-source capacitance in conjunction with a series LC resonant circuit is used to provide maximum power-added efficiency. Simulation data indicate that this amplifier provides an 8% improvement over the conventional Class-B approach at X-band.

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