Bandwidth Enhancement of Doherty Power Amplifier Using Modified Load Modulation Network
|Title:||Bandwidth Enhancement of Doherty Power Amplifier Using Modified Load Modulation Network||Authors:||Li, Meng; Pang, Jingzhou; Li, Yue; Zhu, Anding||Permanent link:||http://hdl.handle.net/10197/11746||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:||Broadband; Doherty power amplifier; High efficiency; Load 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:||https://creativecommons.org/licenses/by-nc-nd/3.0/ie/|
|Appears in Collections:||Electrical and Electronic Engineering Research Collection|
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