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Keywords = Chireix outphasing amplifier

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29 pages, 32005 KB  
Review
High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach
by Chiara Ramella, Anna Piacibello, Roberto Quaglia, Vittorio Camarchia and Marco Pirola
Electronics 2017, 6(4), 96; https://doi.org/10.3390/electronics6040096 - 13 Nov 2017
Cited by 44 | Viewed by 16825
Abstract
Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the [...] Read more.
Modern mobile communication signals require power amplifiers able to maintain very high efficiency in a wide range of output power levels, which is a major issue for classical power amplifier architectures. Following the load-modulation approach, efficiency enhancement is achieved by dynamically changing the amplifier load impedance as a function of the input power. In this paper, a review of the widely-adopted Doherty power amplifier and of the other load-modulation efficiency enhancement techniques is presented. The main theoretical aspects behind each method are introduced, and the most relevant practical implementations available in recent literature are reported and discussed. Full article
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