Enhancing Bandwidth and Back-Off Range of Doherty Power Amplifier With Modified Load Modulation Network
Files in This Item:
|tmtt_2021_3056402_final version.pdf||15.07 MB||Adobe PDF||Download|
|Title:||Enhancing Bandwidth and Back-Off Range of Doherty Power Amplifier With Modified Load Modulation Network||Authors:||Xu, Y. (Yang); Pang, Jingzhou; Wang, Xiaoyu; Zhu, 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:||Bandwidth; Impedance; Broadband communication; Peak 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|
Show full item record
If you are a publisher or author and have copyright concerns for any item, please email firstname.lastname@example.org and the item will be withdrawn immediately. The author or person responsible for depositing the article will be contacted within one business day.