NDLI: Harmonically tuned GaN-HEMT Doherty power amplifier for 6 GHz applications

Content Provider	IEEE Xplore Digital Library
Author	Gruner, D. Bathich, K. Tanany, A.A. Boeck, G.
Copyright Year	2011
Description	Author affiliation: Microwave Engineering Laboratory, Berlin Institute of Technology, Berlin, Germany (Gruner, D.; Bathich, K.; Tanany, A.A.; Boeck, G.)
Abstract	In this paper a GaN-HEMT Doherty amplifier targeted for vehicular applications at 6 GHz is presented. The harmonic tuning of the selected bare-die transistors was investigated and implemented in order to improve the overall large-signal performance. The Doherty amplifier was studied and optimized on device reference plane level using two equally sized 8-Watt GaN devices for the main class-AB and the peaking class-C amplifiers. The measured maximum output power was 41.5 dBm with 63 % peak drain efficiency (50 % power added efficiency). At 6 dB output power back-off a drain efficiency of 49 % (42 % power added efficiency) was obtained. The linearity of the amplifier was tested by applying modulated signals according to the IEEE 802.11p standard. At 34 dBm average output power a drain efficiency of 43 % was achieved for this high dynamic range OFDM signal. After digital pre-distortion, the related adjacent channel power ratio could be reduced from −31 dBc to values below −43 dBc without significant impact on the efficiency performance.
Starting Page	112
Ending Page	115
File Size	451122
Page Count	4
File Format	PDF
ISBN	9781612842363
e-ISBN	9782874870231
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-10
Publisher Place	United Kingdom
Access Restriction	Subscribed
Rights Holder	EUROPEAN MICROWAVE ASSOC
Subject Keyword	Microwave integrated circuits Power amplifiers high-electron mobility transistor Harmonic analysis efficiency enhancement Microwave amplifiers Doherty amplifier Transistors Impedance Gallium nitride Power generation
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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