Yang, MengsuMengsuYangXia, JingJingXiaZhu, AndingAndingZhu2019-05-012019-05-012015 IEEE2015-12-09978-1-4799-8765-8http://hdl.handle.net/10197/10243The 2015 Asia-Pacific Microwave Conference (APMC), Nanjing, China, 6-9 December 2015In this paper, the design and measurement results of a 1.8 GHz to 2.3 GHz broadband Doherty power amplifier (DPA) are reported. A modified load modulation network is designed to minimize impedance transformation ratio over the entire dynamic range for the purpose of extending the operating bandwidth. Experimental results show that the drain efficiency of the proposed DPA maintains above 50% and 63% with continuous wave input signal powers of 26 dBm and 34 dBm, respectively, from 1.8 GHz to 2.3 GHz. When stimulated by a 60-MHz, 12- carrier UMTS signal at 2.14 GHz, the proposed DPA achieved an average efficiency of 53% at 7.6 dB back-off, while the corresponding adjacent channel leakage ratio is linearized to -48.4 dBc with digital predistortion.en© 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Doherty power amplifiersBroadband power amplifiersDigital predistortionHigh-efficiency amplifiersConference Publication10.1109/apmc.2015.74116672019-01-2713/RC/207712/IA/1267https://creativecommons.org/licenses/by-nc-nd/3.0/ie/