Broadband RF-Input Continuous-Mode Load-Modulated Balanced Power Amplifier With Input Phase Adjustment

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Title: Broadband RF-Input Continuous-Mode Load-Modulated Balanced Power Amplifier With Input Phase Adjustment
Authors: Pang, JingzhouChu, ChenhaoLi, YueZhu, Anding
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Date: Oct-2020
Online since: 2021-03-10T16:38:52Z
Abstract: This article presents the theory and design methodology of broadband RF-input continuous-mode load-modulated balanced power amplifier (CM-LMBA) by introducing the CM output-matching networks in the LMBA architecture. It is illustrated that the CM impedance condition can be achieved by properly adjusting the phase difference between the different PA branches in the proposed CM-LMBA during the entire load modulation process. An RF-input CM-LMBA with 1.45-2.45-GHz bandwidth using commercial GaN transistors is designed and implemented to validate the proposed architecture. The fabricated CM-LMBA attains a measured 11.2-13.4-dB gain and around 40-W saturated power. Power-added efficiency (PAE) of 46.4%-56.5% and 43.2%-50.3% is achieved at 6- and 8-dB output power back-offs throughout the designed band. When driven by a 100-MHz OFDM signal with an 8-dB peak-to-average power ratio (PAPR), the proposed CM-LMBA achieves better than -46-dBc adjacent channel leakage ratio (ACLR) and higher than 45% average PAE after digital predistortion at 1.8 and 2.1 GHz.
Funding Details: Science Foundation Ireland
Funding Details: Trinity College Dublin (TCD)
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Microwave Theory and Techniques
Volume: 68
Issue: 10
Start page: 4466
End page: 4478
Copyright (published version): 2020 IEEE
Keywords: BandwidthImpedanceBroadband communicationPhase modulationWireless communicationPeak to average power ratio
DOI: 10.1109/tmtt.2020.3012141
Language: en
Status of Item: Peer reviewed
ISSN: 0018-9480
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Appears in Collections:Electrical and Electronic Engineering Research Collection

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