A high efficiency UHF linear power amplifier.

摘要

An RF amplifier for a phase and envelope varying signal employs a class C operated device (110) for high efficiency. In order to improve the linearity of the class C operated device (110), a signal (s2(t)) corresponding to the envelope of the amplifier output is formed and a portion thereof is fedback to an envelope modulation element such as a pulse width modulator (140) connected to the class C operated device (110) to reduce distortion at the amplifier output.