Implementation of Efficiency Enhancement Techniques in the Linear Region of Operations of Power Amplifier
نویسندگان
چکیده
Radio signals typically are subject to very large transmission losses and distortions due to nonlinearities that might be added by the limited dynamic range of power amplifiers [1], [2]. Particularly, the signal gets distorted when the power amplifier is used at its full rated RF power level and/or Maximum efficiency is attained only at one single power level, usually closer to the maximum rated power of the device. Thus, linear RF power amplifiers with high efficiency and, power gain are recommended to compensate such nonlinearities. But achieving high efficiency and high linearity simultaneously in power amplifier design, is the most challenging task. In this paper, implementations of efficiency enhancement techniques in the linear region of operations of power amplifier are discussed as a solution to these distortions. Techniques to improve efficiency, such as Chireix outphasisng or LInear amplification using +on linear Component (LI+C), Doherty Configuration, Kahn Envelope Elimination, Restoration (EER) and Envelope Tracking (ET) are presented and discussed.
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