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Paper Abstract and Keywords
Presentation 2024-07-12 11:05
Interference Canceler Circuit Configuration for Rx Caused by Tx Power Amplifier using Vector Modulator
Yuki Takagi, Yoshichika Ohta (SB) EMT2024-38 MW2024-62 OPE2024-41 EST2024-39 MWPTHz2024-45
Abstract (in Japanese) (See Japanese page) 
(in English) In this paper, we propose a circuit configuration that uses a vector modulator to cancel interference signals from the Tx power amplifier to the Rx. The interference noise output from the Tx power amplifier in the demonstration experiment was verified at the output level including digital pre-distortion (DPD) using a commercially available product manufactured by Analog Devices. It uses an asymmetric Doherty amplifier using a T-shaped stub, and has a maximum drain efficiency of 66.8% on a saturated output power of 48.1 dBm, and a drain efficiency of 45.7% on 8.6 dB output backoff (Pout=39.5 dBm) at a fundamental frequency of 950 MHz were obtained, respectively. In the canceller test, the modulated signal output level of the final stage amplifier of the Tx was 38.8 dBm with a center frequency of 950 MHz and a bandwidth of 10 MHz. In addition, the drain efficiency of the amplifier was 50.2%, and the EVM with DPD was 2.85%. Compared to the case without canceller, we can cancel up to 20.6 dB of noise at the Rx system frequency of 905 MHz. We also confirmed that the EVM of the received signal could be improved by 25.4% (8.23 dB) by 41.5% without correction and by 16.1% with correction.
Keyword (in Japanese) (See Japanese page) 
(in English) power amplifier / asymmetric Doherty amplifier / canceller circuit / vector modulator / / / /  
Reference Info. IEICE Tech. Rep., vol. 124, no. 96, MW2024-62, pp. 158-162, July 2024.
Paper # MW2024-62 
Date of Issue 2024-07-04 (EMT, MW, OPE, EST, MWPTHz) 
ISSN 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 EMT2024-38 MW2024-62 OPE2024-41 EST2024-39 MWPTHz2024-45

Conference Information
Committee MW EMT OPE MWPTHz EST IEE-EMT  
Conference Date 2024-07-11 - 2024-07-12 
Place (in Japanese) (See Japanese page) 
Place (in English) otaru-shimin-kaikan 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Workshop on Optical and Microwave technologies 
Paper Information
Registration To MW 
Conference Code 2024-07-MW-EMT-OPE-MWPTHz-EST-EMT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Interference Canceler Circuit Configuration for Rx Caused by Tx Power Amplifier using Vector Modulator 
Sub Title (in English)  
Keyword(1) power amplifier  
Keyword(2) asymmetric Doherty amplifier  
Keyword(3) canceller circuit  
Keyword(4) vector modulator  
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1st Author's Name Yuki Takagi  
1st Author's Affiliation SoftBank (SB)
2nd Author's Name Yoshichika Ohta  
2nd Author's Affiliation SoftBank (SB)
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Speaker Author-1 
Date Time 2024-07-12 11:05:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # EMT2024-38, MW2024-62, OPE2024-41, EST2024-39, MWPTHz2024-45 
Volume (vol) vol.124 
Number (no) no.95(EMT), no.96(MW), no.97(OPE), no.98(EST), no.99(MWPTHz) 
Page pp.158-162 
#Pages 5 
Date of Issue 2024-07-04 (EMT, MW, OPE, EST, MWPTHz) 

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