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Paper Abstract and Keywords
Presentation 2010-11-26 11:00
Amplitude Adjustment Spur Suppression Technique of a Digital Frequency Synthesizer Using a PH-DAC
Kenichi Tajima, Ryoji Hayashi, Morishige Hieda (Mitsubishi Electric corp.) MW2010-117
Abstract (in Japanese) (See Japanese page) 
(in English) This paper presents a novel spur suppression technique for a direct digital synthesizer (DDS) with a phase holding digital-to-analog converter (PH-DAC). A PH-DAC, which uses a reverse-sign step-function as a sampling pulse waveform, enhances the first image of aliasing, which is of higher frequency than the fundamental. Here the first image is treated as a desired signal, while the fundamental and the second image are spurs. This paper describes a novel spur suppression technique by reverse-phase cancellation. To obtain equal signal amplitudes at spur frequencies, the proposed technique adjusts amplitude coefficients of a signal according to the output frequency. Evaluated spur levels of the proposed DDS in the L-band are from -38.6 to -24 dBc, and are improved by 13.5 dB or more.
Keyword (in Japanese) (See Japanese page) 
(in English) Direct digital synthesizer / phase holding / digital analog converter / / / / /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 307, MW2010-117, pp. 71-74, Nov. 2010.
Paper # MW2010-117 
Date of Issue 2010-11-18 (MW) 
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 MW2010-117

Conference Information
Committee MW  
Conference Date 2010-11-25 - 2010-11-26 
Place (in Japanese) (See Japanese page) 
Place (in English) Tiruru 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To MW 
Conference Code 2010-11-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Amplitude Adjustment Spur Suppression Technique of a Digital Frequency Synthesizer Using a PH-DAC 
Sub Title (in English)  
Keyword(1) Direct digital synthesizer  
Keyword(2) phase holding  
Keyword(3) digital analog converter  
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1st Author's Name Kenichi Tajima  
1st Author's Affiliation Mitsubishi Electric corporation (Mitsubishi Electric corp.)
2nd Author's Name Ryoji Hayashi  
2nd Author's Affiliation Mitsubishi Electric corporation (Mitsubishi Electric corp.)
3rd Author's Name Morishige Hieda  
3rd Author's Affiliation Mitsubishi Electric corporation (Mitsubishi Electric corp.)
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Speaker Author-1 
Date Time 2010-11-26 11:00:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2010-117 
Volume (vol) vol.110 
Number (no) no.307 
Page pp.71-74 
#Pages 4 
Date of Issue 2010-11-18 (MW) 

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