A Broadband High-Efficiency Doherty Power Amplifier with Integrated Compensating Reactance
|Title:||A Broadband High-Efficiency Doherty Power Amplifier with Integrated Compensating Reactance||Authors:||Xia, Jing; Yang, Mengsu; Guo, Yan; Zhu, Anding||Permanent link:||http://hdl.handle.net/10197/8390||Date:||Jul-2016||Online since:||2017-03-10T15:44:55Z||Abstract:||This paper presents a high-efficiency gallium nitride Doherty power amplifier (DPA) using an integrated compensating reactance (CR) for broadband operation. With an additional quarter-wavelength transmission line integrated in the peaking amplifier output, a CR is generated to compensate the load impedance of the carrier amplifier in the low-power region and thus enhance the back-off efficiency over a wide frequency range without affecting the Doherty load modulation at saturation. For this purpose, a peaking output matching network (OMN) is employed to convert the output impedance of the peaking device into quasi-short circuit when it is off and achieve proper impedance matching when it is on. A two-point matching technique using the transmission (ABCD) matrix is employed to design such desired OMN. Measurement results show that the DPA has a 6-dB back-off efficiency of 50%-55% and a saturated efficiency of 57%-71% over the frequency band of 1.7-2.8 GHz (49% fractional bandwidth). When driven by a 20-MHz long term evolution modulated signal at 6.5-dB back-off power, the DPA can achieve an average efficiency of more than 50% with high linearity after linearization over the design frequency band.||Funding Details:||Science Foundation Ireland||Type of material:||Journal Article||Publisher:||IEEE||Journal:||IEEE Transactions on Microwave Theory and Techniques||Volume:||64||Issue:||7||Start page:||2014||End page:||2024||Copyright (published version):||2016 IEEE||Keywords:||Broadband; Digital linearization; Doherty; High efficiency; Integrated compensating reactance; Power amplifiers||DOI:||10.1109/TMTT.2016.2574861||Language:||en||Status of Item:||Peer reviewed||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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