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A Broadband High-Efficiency Doherty Power Amplifier with Integrated Compensating Reactance
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| TMTT-2015-10-1266_Sourcefile.pdf | 1.11 MB | Adobe PDF | Download |
| 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 | 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 | 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 |
| Appears in Collections: | Electrical and Electronic Engineering Research Collection |
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