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Paper Abstract and Keywords
Presentation 2017-07-21 11:00
An 80MHz Modulation Bandwidth High Efficiency Multi-band Envelope-Tracking Power Amplifier Using GaN Single-Phase Buck-Converter
Shuichi Sakata (Mitsubishi Electric), Sandro Lanfranco, Tapio Kolmonen, Olli Piirainen (Nokia Bell Labs), Takanobu Fujiwara, Shintaro Shinjo (Mitsubishi Electric), Peter Asbeck (Univ. of California, San Diego) EMT2017-31 MW2017-56 OPE2017-36 EST2017-33 MWP2017-33
Abstract (in Japanese) (See Japanese page) 
(in English) We report a high efficiency multi-band Envelope-Tracking Power Amplifier (ET-PA) that supports modulation bandwidth up to 80MHz using real-time digital predistortion (RT-DPD). The ET-PA consists of a broadband RF-PA and a single phase buck-converter. The RF-PA has maximum PAE over 50% from 0.7 to 2.1GHz in CW measurements. The buck-converter operates at 245.76MHz switching frequency, and attains 78% PAE for modulated signals with 6.5dB PAPR. Both RF-PA and buck converter were fabricated using a GaN HEMT process. The RT-DPD system can generate the input signals for both buck-converter and RF-PA, and capture the output signal for feedback. An FPGA is employed in the RT-DPD system to perform predistortion in a closed-loop fashion. The overall ET-PA achieves total efficiency of 32.1-35.5%, output power of 30-30.7dBm with 30V supply voltage over 0.9-2.15GHz. By using the RT-DPD, ACLR is improved to below -45dBc even under 80MHz modulated LTE signal with 6.5dB PAPR, maintaining high efficiency. To the authors’ best knowledge, this is the widest modulation bandwidth yet reported for an efficient and multi-band ET-PA.
Keyword (in Japanese) (See Japanese page) 
(in English) GaN / Power Amplifier / Switching-Mode Power Amplifier / Envelope Tracking / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 140, MW2017-56, pp. 133-138, July 2017.
Paper # MW2017-56 
Date of Issue 2017-07-13 (EMT, MW, OPE, EST, MWP) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF EMT2017-31 MW2017-56 OPE2017-36 EST2017-33 MWP2017-33

Conference Information
Committee MWP OPE EMT MW EST IEE-EMT  
Conference Date 2017-07-20 - 2017-07-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Obihiro Chamber of Commerce and Industry 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Light wave & Electromagnetic Wave Workshop 
Paper Information
Registration To MW 
Conference Code 2017-07-MWP-OPE-EMT-MW-EST-EMT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) An 80MHz Modulation Bandwidth High Efficiency Multi-band Envelope-Tracking Power Amplifier Using GaN Single-Phase Buck-Converter 
Sub Title (in English)  
Keyword(1) GaN  
Keyword(2) Power Amplifier  
Keyword(3) Switching-Mode Power Amplifier  
Keyword(4) Envelope Tracking  
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1st Author's Name Shuichi Sakata  
1st Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric)
2nd Author's Name Sandro Lanfranco  
2nd Author's Affiliation Nokia Bell Labs (Nokia Bell Labs)
3rd Author's Name Tapio Kolmonen  
3rd Author's Affiliation Nokia Bell Labs (Nokia Bell Labs)
4th Author's Name Olli Piirainen  
4th Author's Affiliation Nokia Bell Labs (Nokia Bell Labs)
5th Author's Name Takanobu Fujiwara  
5th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric)
6th Author's Name Shintaro Shinjo  
6th Author's Affiliation Mitsubishi Electric Corporation (Mitsubishi Electric)
7th Author's Name Peter Asbeck  
7th Author's Affiliation University of California, San Diego (Univ. of California, San Diego)
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Speaker Author-1 
Date Time 2017-07-21 11:00:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # EMT2017-31, MW2017-56, OPE2017-36, EST2017-33, MWP2017-33 
Volume (vol) vol.117 
Number (no) no.139(EMT), no.140(MW), no.141(OPE), no.142(EST), no.143(MWP) 
Page pp.133-138 
#Pages 6 
Date of Issue 2017-07-13 (EMT, MW, OPE, EST, MWP) 

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