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Electronics 2017, 6(4), 96; https://doi.org/10.3390/electronics6040096

High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach

1
Department of Electronics and Telecommunications, Politecnico di Torino, Torino 10129, Italy
2
Centre for High Frequency Engineering, Cardiff University, Cardiff CF10 3AT, UK
*
Author to whom correspondence should be addressed.
Received: 12 October 2017 / Revised: 3 November 2017 / Accepted: 9 November 2017 / Published: 13 November 2017
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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 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. View Full-Text
Keywords: high power amplifiers; high frequency transmitters; wireless communications; high efficiency; Doherty power amplifier; Chireix outphasing amplifier; load modulated balanced amplifier high power amplifiers; high frequency transmitters; wireless communications; high efficiency; Doherty power amplifier; Chireix outphasing amplifier; load modulated balanced amplifier
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Ramella, C.; Piacibello, A.; Quaglia, R.; Camarchia, V.; Pirola, M. High Efficiency Power Amplifiers for Modern Mobile Communications: The Load-Modulation Approach. Electronics 2017, 6, 96.

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