Enhancing Bandwidth and Back-Off Range of Doherty Power Amplifier With Modified Load Modulation Network

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Title: Enhancing Bandwidth and Back-Off Range of Doherty Power Amplifier With Modified Load Modulation Network
Authors: Xu, Y. (Yang)Pang, JingzhouWang, XiaoyuZhu, Anding
Permanent link: http://hdl.handle.net/10197/12029
Date: 12-Feb-2021
Online since: 2021-03-10T17:33:13Z
Abstract: This article presents a novel methodology for designing a broadband Doherty power amplifier (DPA) with extended output power back-off (OBO) range. A modified load modulation network (LMN) is proposed to enhance the OBO range and the bandwidth of the DPA simultaneously. Analysis is conducted to explore the relationship between the proposed LMN parameters and the broadband performance under various OBO levels. Generalized design formulas of the LMN parameters are then introduced to offer the broadband solution for arbitrary current ratios and OBO levels. An asymmetric DPA is demonstrated and implemented with gallium nitride (GaN) transistors using the proposed approach. The fabricated DPA operates from 1.4 to 2.5 GHz with 9-dB OBO range. The measured drain efficiency reaches 61%-75.5% at saturation and 44.6%-54.6% at 9-dB OBO within the operating bandwidth. When driven by a 60-MHz modulated signal with 9-dB peak-to-average power ratio (PAPR), the fabricated DPA attains 47.4%-53.5% average drain efficiency and better than -45.5-dBc adjacent channel leakage ratio (ACLR) after digital predistortion.
Funding Details: Science Foundation Ireland
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Microwave Theory and Techniques
Copyright (published version): 2021 IEEE
Keywords: BandwidthImpedanceBroadband communicationPeak to average power ratio
DOI: 10.1109/tmtt.2021.3056402
Language: en
Status of Item: Peer reviewed
ISSN: 0018-9480
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Electrical and Electronic Engineering Research Collection

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