A design method for highly efficient power amplifiers: Application to class F amplifiers

Abstract

A method for the design of high‐power‐added efficiency amplifiers, based on optimum load investigations, is presented. The key point of the proposed method is the successive adjustments of the device loads presented at fundamental and harmonic frequencies. Effects of harmonic tuning on power performances are investigated by an extensive analysis of current and voltage drain waveforms. Experimental results of two microwave amplifiers at 1.75 GHz and 7.5 GHz, clearly show the value of this method. Their designs and performances are reported. © 1996 John Wiley & Sons, Inc.

Analysis of the Doherty technique and application to a 900MHz power amplifier

“…In recent years, there has been a strong demand to improve the efficiency of power amplifier for wireless communications. The techniques generally used are based on the description of particular loads at the harmonic frequency (1,2,3). Such techniques are efficient at high power level.…”