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Paper Abstract and Keywords
Presentation 2021-10-14 11:15
AM-AM Behavior Model that Reproduces the Gain Increase Phenomenon of RF Power Amplifier
Satoshi Tanaka (Murata) CAS2021-20 NLP2021-18
Abstract (in Japanese) (See Japanese page) 
(in English) In 5G (5th Generation) mobile phone, QAM (quadrature amplitude modulation) which has high PAPR (peak to average power ratio) is applied. Therefore, PA (power amplifier) is required to achieve high linearity. Recently HBT (hetero bipolar transistor) is widely applied to PAs for mobile phone terminals. In the single-stage PA to which HBT is applied, the gain from the signal source to the base decreases as the output power increase. On the other hand, the gain from the base to the output increases as the output power increases. In a PA with HBT applied, the combined characteristics of two characteristics having the opposite characteristics to each other become the overall characteristics. An AM (amplitude modulation)-AM behavior model that can express both the increase and decrease of gain is useful for grasping the characteristics of such PA. The model reported so far has been well expressed for PA saturation, that is, a decrease in gain, but there was no expression of the increase in gain generated when the output power was increased. In this report, a model that can express the increase in gain using gaussian functions is proposed.
Keyword (in Japanese) (See Japanese page) 
(in English) Mobile Phone / Power Amplifier / Non-Linear / Behavior Model / AM-AM / / /  
Reference Info. IEICE Tech. Rep., vol. 121, no. 196, CAS2021-20, pp. 17-22, Oct. 2021.
Paper # CAS2021-20 
Date of Issue 2021-10-07 (CAS, NLP) 
ISSN Online edition: ISSN 2432-6380
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 CAS2021-20 NLP2021-18

Conference Information
Committee CAS NLP  
Conference Date 2021-10-14 - 2021-10-15 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To CAS 
Conference Code 2021-10-CAS-NLP 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) AM-AM Behavior Model that Reproduces the Gain Increase Phenomenon of RF Power Amplifier 
Sub Title (in English)  
Keyword(1) Mobile Phone  
Keyword(2) Power Amplifier  
Keyword(3) Non-Linear  
Keyword(4) Behavior Model  
Keyword(5) AM-AM  
1st Author's Name Satoshi Tanaka  
1st Author's Affiliation Murata Manufacturing Co., Ltd. (Murata)
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Speaker Author-1 
Date Time 2021-10-14 11:15:00 
Presentation Time 25 minutes 
Registration for CAS 
Paper # CAS2021-20, NLP2021-18 
Volume (vol) vol.121 
Number (no) no.196(CAS), no.197(NLP) 
Page pp.17-22 
Date of Issue 2021-10-07 (CAS, NLP) 

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