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Paper Abstract and Keywords
Presentation 2012-03-09 17:05
A Study on Transversal-Filter Type of Power Amplifier for Applying Switching Operation Transmitter
Michiaki Kojima, Hironori Izumi, Yohtaro Umeda (Tokyo Univ. of Science), Osamu Takyu (Shinshu Univ.) RCS2011-374
Abstract (in Japanese) (See Japanese page) 
(in English) A transmitter in wireless communication requires high power-efficiency, high linearity, and low distortion. Envelope pulse width modulation (EPWM) transmitter with Δ-? modulation has a lot of attention in recent years to realize them. EPWM enables a high power-efficiency and high linearity by inputting a square pulse to its power amplifier. It also enables a reduction of a quantization noise on a desired signal band by a noise shaping at Δ-Σ modulation. The quantization noise shaped out of the desired signal band is reduced by a RF narrow BPF. However, a favored candidate for this is only a filter using piezoelectric elements which cannot change its center frequency and pass-band width widely at the RF band. This paper proposes the transversal-filter type of a power amplifier where switching operation amplifiers are inserted into each transversal filter tap. It reduces quantization noise and can change both a center frequency by varying its delays and a bandwidth by changing the number of its taps widely. The signal from EPWM with 16QAM is inputted to the amplifier and the outputs of each tap are combined by applying 180 degree hybrids. The performance is evaluated by calculating power efficiency, power spectrum density and constellations. Finally, it is revealed that the quantization noise is reduced with maintaining the power efficiency at the desired signal band as increasing the proposal amplifier’s tap.
Keyword (in Japanese) (See Japanese page) 
(in English) Class E Power Amplifier / EPWM / EVM / 180 Degree Hybrid / Transversal Filter / / /  
Reference Info. IEICE Tech. Rep., vol. 111, no. 451, RCS2011-374, pp. 347-352, March 2012.
Paper # RCS2011-374 
Date of Issue 2012-02-29 (RCS) 
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 RCS2011-374

Conference Information
Committee SR RCS SRW  
Conference Date 2012-03-07 - 2012-03-09 
Place (in Japanese) (See Japanese page) 
Place (in English) YRP 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Mobile Communication Workshop 
Paper Information
Registration To RCS 
Conference Code 2012-03-SR-RCS-SRW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A Study on Transversal-Filter Type of Power Amplifier for Applying Switching Operation Transmitter 
Sub Title (in English)  
Keyword(1) Class E Power Amplifier  
Keyword(2) EPWM  
Keyword(3) EVM  
Keyword(4) 180 Degree Hybrid  
Keyword(5) Transversal Filter  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Michiaki Kojima  
1st Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
2nd Author's Name Hironori Izumi  
2nd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
3rd Author's Name Yohtaro Umeda  
3rd Author's Affiliation Tokyo University of Science (Tokyo Univ. of Science)
4th Author's Name Osamu Takyu  
4th Author's Affiliation Shinshu University (Shinshu Univ.)
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Speaker Author-1 
Date Time 2012-03-09 17:05:00 
Presentation Time 25 minutes 
Registration for RCS 
Paper # RCS2011-374 
Volume (vol) vol.111 
Number (no) no.451 
Page pp.347-352 
#Pages 6 
Date of Issue 2012-02-29 (RCS) 

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