An X-Band Class-J Power Amplifier With Active Load Modulation to Boost Drain Efficiency

In this paper, the performance of the class-J mode power amplifier (PA) is studied when an auxiliary network performs active load modulation on the main transistor. Load modulation is realized by injecting an additional class-C like current with conduction angle of α to the drain node of the main transistor. The injected current employs a phase shift of φ with respect to the half-sinusoidal current of the main transistor, and its maximum value...