Analysis and design of power-controllable CMOS class E RF-tuned power amplifiers

Conventional approaches for output-power control of class E-tuned power amplifiers are investigated, which reveals a common drawback of presently popular power-control mechanisms. A novel low-distortion, output-power-control prototype architecture based on high-Q compensated varactors is therefore presented in this study. The architecture also allows the employment of high-Q bond-wire inductors with inductance variations to ensure minimum power loss.