Bandwidth Enhancement of Doherty Power Amplifier Using Modified Load Modulation Network

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Title: Bandwidth Enhancement of Doherty Power Amplifier Using Modified Load Modulation Network
Authors: Li, MengPang, JingzhouLi, YueZhu, Anding
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Date: Jun-2020
Online since: 2020-11-26T11:16:26Z
Abstract: A novel Doherty power amplifier (DPA) architecture with extended bandwidth is presented in this paper. A modified load modulation network is introduced to provide impedance condition required by the Doherty operation in a wide frequency range. Analytical parameter solutions of the proposed load modulation network and the related load modulation process are presented. A DPA with 2.80-3.55 GHz bandwidth utilizing commercial GaN transistors is implemented. The fabricated DPA attains a measured 9.3-11.1 gain and 43.0-45.0 dBm saturated power. 50.0-60.6% and 66-78% drain efficiency is obtained at 6 dB output power back-off and saturation throughout the designed band, respectively. Moreover, the back-off drain efficiencies are higher than 55% within 700 MHz bandwidth. When driven by a 6-carrier 120 MHz OFDM signal with 7.0 dB peak to average power ratio, the proposed DPA achieves adjacent channel leakage ratio of better than -50 dBc after digital pre-distortion (DPD) at 3.20 GHz with average efficiency of 53.3%.
Funding Details: European Commission Horizon 2020
Science Foundation Ireland
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Circuits and Systems I: Regular Papers
Volume: 67
Issue: 6
Start page: 1824
End page: 1834
Copyright (published version): 2020 IEEE
Keywords: BroadbandDoherty power amplifierHigh efficiencyLoad modulation
DOI: 10.1109/tcsi.2020.2972163
Language: en
Status of Item: Peer reviewed
ISSN: 1549-8328
This item is made available under a Creative Commons License:
Appears in Collections:Electrical and Electronic Engineering Research Collection

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