July 2016
Chinese Journal of Liquid Crystal & Displays;Jul2016, Vol. 31 Issue 7, p703
Academic Journal
In communication systems, power amplifiers (PAs) play an important role and consume large amount of power. As a consequence, the enhancement of amplifier efficiency is significantly important for saving energy. The goal for this paper is to find the matching impedances of harmonics and build a matching network for optimum efficiency performance of an amplifier. The load pull technique is applied in this paper to control the impedances with automatically controlled tuners. Firstly, a calibration of the automatically tuners is made to get the correspondence of tuner positions and impedance. Then the tuners are used to control and change the load impedances at 2nd and 3rd harmonics for maximum efficiency performance of an amplifier at fundamental frequency and finally to build a matching network according to the matching impedances at harmonics. Experimental results indicate that the efficiency of the amplifier with harmonic matching can be improved 2.13%. With the method implemented in this paper, the efficiency of the amplifier was improved 2.13%, it realized the goal to improve the efficiency of an amplifier with harmonic. It proves the feasibility of the method investigated in this paper.


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