A Broadband High-Efficiency Doherty Power Amplifier with Integrated Compensating Reactance

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dc.contributor.author Xia, Jing
dc.contributor.author Yang, Mengsu
dc.contributor.author Guo, Yan
dc.contributor.author Zhu, Anding
dc.date.accessioned 2017-03-10T15:44:55Z
dc.date.available 2017-03-10T15:44:55Z
dc.date.copyright 2016 IEEE en
dc.date.issued 2016-07
dc.identifier.citation IEEE Transactions on Microwave Theory and Techniques en
dc.identifier.uri http://hdl.handle.net/10197/8390
dc.description.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. en
dc.description.sponsorship Science Foundation Ireland en
dc.language.iso en en
dc.publisher IEEE en
dc.rights © 2016 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. en
dc.subject Broadband en
dc.subject Digital linearization en
dc.subject Doherty en
dc.subject High efficiency en
dc.subject Integrated compensating reactance en
dc.subject Power amplifiers en
dc.title A Broadband High-Efficiency Doherty Power Amplifier with Integrated Compensating Reactance en
dc.type Journal Article en
dc.internal.authorcontactother anding.zhu@ucd.ie
dc.status Peer reviewed en
dc.identifier.volume 64 en
dc.identifier.issue 7 en
dc.identifier.startpage 2014 en
dc.identifier.endpage 2024 en
dc.identifier.doi 10.1109/TMTT.2016.2574861
dc.neeo.contributor Xia|Jing|aut|
dc.neeo.contributor Yang|Mengsu|aut|
dc.neeo.contributor Guo|Yan|aut|
dc.neeo.contributor Zhu|Anding|aut|
dc.internal.rmsid 611543639
dc.date.updated 2017-01-26T13:10:31Z


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