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Bandwidth Enhancement of Doherty Power Amplifier Using Modified Load Modulation Network
Author(s)
Date Issued
2020-06
Date Available
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%.
Sponsorship
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
Language
English
Status of Item
Peer reviewed
ISSN
1549-8328
This item is made available under a Creative Commons License
File(s)
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Name
WBSDPA__final.pdf
Size
9.24 MB
Format
Adobe PDF
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