Highly efficient GaN Doherty power amplifier for N78 sub-6 GHz band 5G applications

Eid, Mohammed A. Elsayed, Abouelnaga, Tamer G., Ibrahim, Hamed A., Hamad, Ehab K. I., Al-Gburi, Ahmed Jamal Abdullah, Alghamdi, Thamer A. H. and Alathbah, Moath 2023. Highly efficient GaN Doherty power amplifier for N78 sub-6 GHz band 5G applications. Electronics 12 (19) , 4001. 10.3390/electronics12194001

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Abstract

In this paper, a high-efficiency GaN Doherty power amplifier (DPA) for 5G applications in the N78 sub-6 GHz band is introduced. The theoretical analysis of the matching networks for the peak and carrier transistors is presented, with a focus on the impact of unequal power splitting for both transistors and the recommendation of a post-harmonic suppression network. The proposed design features an unequal Wilkinson power divider at the input and a post-harmonic suppression network at the output, both of which are crucial for achieving high efficiency. The Doherty power amplifier comprises two GaN 10 W HEMTs, measured across the 3.3 GHz to 3.8 GHz band (the N78 band), and the results reveal significant improvements in gain, output power, drain efficiency, and power-added efficiency. Specifically, the proposed design achieved a power gain of over 12 dB and 42 dBm saturated output power. It also achieved a drain efficiency of 80% at saturation and a power-added efficiency of 75.2%. Furthermore, the proposed harmonic suppression network effectively attenuated the harmonics at the output of the amplifier from the second to the fourth order to more than −50 dB, thus enhancing the device’s linearity.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Engineering
Additional Information:	License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/4.0/, Type: open-access
Publisher:	MDPI
Date of First Compliant Deposit:	10 October 2023
Date of Acceptance:	19 September 2023
Last Modified:	11 Oct 2023 03:24
URI:	https://orca.cardiff.ac.uk/id/eprint/163102

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