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Paper Abstract and Keywords
Presentation 2018-07-19 16:15
A Formulation of Gain Margin and Required Power for Closed-Loop Active Load-Pull Systems
Kentaro Kawabe, Toshio Ishizaki (Ryukoku Univ.) EMT2018-32 MW2018-47 OPE2018-35 EST2018-30 MWP2018-31
Abstract (in Japanese) (See Japanese page) 
(in English) As a design method for microwave power amplifier, passive load-pull method for obtaining the optimum load impedance is well-known. But, it has some problems such as narrow measurement range due to the loss of impedance tuner. The Active Load-Pull (ALP) system which can solve this problem attracts attention. ALP can be categorized in open-loop type and closed-loop type. The closed-loop type were researched actively, because of its high speed measurement and ease of control of reflected waves. However, closed-loop type has a risk of oscillation. In order to solve the problem, the authors propose a composite ALP system with open-loop and closed-loop. ALP gain margin, required injection power were derived analytically and experiments were carried out. It was confirmed the gain margin depends only on the reflection coefficient to be created. And it was found that the required power depends on the output impedance of the DUT. By comparing the performances of the proposed and conventional ALPs, gain margin was improved 6dB and power requirements was improved 3dB, when injection powers of open-loop and closed-loop is equal.
Keyword (in Japanese) (See Japanese page) 
(in English) Microwave power amplifier / Active load-pull / Open-Loop / Closed-Loop / Gain margin / Injection power / /  
Reference Info. IEICE Tech. Rep., vol. 118, no. 142, MW2018-47, pp. 137-142, July 2018.
Paper # MW2018-47 
Date of Issue 2018-07-12 (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 EMT2018-32 MW2018-47 OPE2018-35 EST2018-30 MWP2018-31

Conference Information
Committee EST MW OPE MWP EMT IEE-EMT THz  
Conference Date 2018-07-19 - 2018-07-20 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To MW 
Conference Code 2018-07-EST-MW-OPE-MWP-EMT-EMT-THz 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Formulation of Gain Margin and Required Power for Closed-Loop Active Load-Pull Systems 
Sub Title (in English)  
Keyword(1) Microwave power amplifier  
Keyword(2) Active load-pull  
Keyword(3) Open-Loop  
Keyword(4) Closed-Loop  
Keyword(5) Gain margin  
Keyword(6) Injection power  
Keyword(7)  
Keyword(8)  
1st Author's Name Kentaro Kawabe  
1st Author's Affiliation Ryukoku University (Ryukoku Univ.)
2nd Author's Name Toshio Ishizaki  
2nd Author's Affiliation Ryukoku University (Ryukoku Univ.)
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Speaker Author-1 
Date Time 2018-07-19 16:15:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # EMT2018-32, MW2018-47, OPE2018-35, EST2018-30, MWP2018-31 
Volume (vol) vol.118 
Number (no) no.141(EMT), no.142(MW), no.143(OPE), no.144(EST), no.145(MWP) 
Page pp.137-142 
#Pages 6 
Date of Issue 2018-07-12 (EMT, MW, OPE, EST, MWP) 

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