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Open AccessFeature PaperReview

Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems

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SARAS Technology Limited, Leeds LS12 4NQ, UK
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School of Electrical Engineering and Computer Science, Faculty of Engineering and Informatics, University of Bradford, Bradford BD7 1DP, UK
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Computer Systems Department, Ninevah Technical Institute, Northern Technical University, 41001 Mosul, Iraq
*
Authors to whom correspondence should be addressed.
Electronics 2019, 8(6), 638; https://doi.org/10.3390/electronics8060638
Received: 15 April 2019 / Revised: 31 May 2019 / Accepted: 2 June 2019 / Published: 6 June 2019
(This article belongs to the Special Issue Recent Technical Developments in Energy-Efficient 5G Mobile Cells)
Power amplifiers in modern and future communications should be able to handle different modulation standards at different frequency bands, and in addition, to be compatible with the previous generations. This paper reviews the recent design techniques that have been used to operate dual-band amplifiers and in particular the Doherty amplifiers. Special attention is focused on the design methodologies used for power splitters, phase compensation networks, impedance inverter networks and impedance transformer networks of such power amplifier. The most important materials of the dual-band Doherty amplifier are highlighted and surveyed. The main problems and challenges covering dual-band design concepts are presented and discussed. In addition, improvement techniques to enhance such operations are also exploited. The study shows that the transistor parasitic has a great impact in the design of a dual-band amplifier, and reduction of the transforming ratio of the inverter simplifies the dual-band design. The offset line can be functionally replaced by a Π-network in dual-band design rather than T-network. View Full-Text
Keywords: dual-band Doherty power amplifier; LTE-advanced; high-efficiency; phase offset lines; impedance inverter network; phase compensation network dual-band Doherty power amplifier; LTE-advanced; high-efficiency; phase offset lines; impedance inverter network; phase compensation network
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Abdulkhaleq, A.M.; Yahya, M.A.; McEwan, N.; Rayit, A.; Abd-Alhameed, R.A.; Ojaroudi Parchin, N.; Al-Yasir, Y.I.A.; Noras, J. Recent Developments of Dual-Band Doherty Power Amplifiers for Upcoming Mobile Communications Systems. Electronics 2019, 8, 638.

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