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Paper Abstract and Keywords
Presentation 2018-09-21 09:30
A 26GHz-band Image Enhancement Type 1-Bit DAC for Direct Digital RF Modulator
Junhao Zhang, Masafumi Kazuno, Mizuki Motoyoshi, Suguru Kameda, Noriharu Suematsu (Tohoku Univ.) MW2018-62
Abstract (in Japanese) (See Japanese page) 
(in English) We have proposed 1-bit bandpass ΔΣ modulator using high order image component as a configuration of direct digital RF modulator which can generate the RF signal beyond the Nyquist frequency directly from the digital signal. In the case that the transmission line, such as optical fiber, is applied as a feed line to transmit the 1-bit stream from the DSP to the 1-bit DAC, the high order image components are attenuated significantly because of the lowpass characteristics of the transmission line. In this paper, we proposed an image enhancement type 1-bit DAC which can generate the high order image component from the lowpass filtered DSP output signal. The proposed image enhancement type 1-bit DAC is fabricated in 65nm CMOS process. In the case of 1.2 Vp-p / 8 Gbps Manchester coding 1-bit bandpass ΔΣ modulated stream which can generate 5Mbps-QPSK signal in the 1st Nyquist zone (2GHz), the proposed DAC achieves -36.4dBm of the RF output power , 28.3 dB of SNR, and 6.5% of EVM in the 7th Nyquist zone (26GHz) under the condition of the lowpass filtered (fc=8 GHz) 1-bit stream.
Keyword (in Japanese) (See Japanese page) 
(in English) digital to analog converter / digital RF / delta-sigma / 1-bit / image / transmitters / microwaves / RFIC  
Reference Info. IEICE Tech. Rep., vol. 118, no. 218, MW2018-62, pp. 17-21, Sept. 2018.
Paper # MW2018-62 
Date of Issue 2018-09-13 (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 MW2018-62

Conference Information
Committee AP MW  
Conference Date 2018-09-20 - 2018-09-21 
Place (in Japanese) (See Japanese page) 
Place (in English) Tokyo Tech 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Microwave, Millimeter wave, Measurement, Antennas and Propagation 
Paper Information
Registration To MW 
Conference Code 2018-09-AP-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) A 26GHz-band Image Enhancement Type 1-Bit DAC for Direct Digital RF Modulator 
Sub Title (in English)  
Keyword(1) digital to analog converter  
Keyword(2) digital RF  
Keyword(3) delta-sigma  
Keyword(4) 1-bit  
Keyword(5) image  
Keyword(6) transmitters  
Keyword(7) microwaves  
Keyword(8) RFIC  
1st Author's Name Junhao Zhang  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Masafumi Kazuno  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Mizuki Motoyoshi  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Suguru Kameda  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
5th Author's Name Noriharu Suematsu  
5th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2018-09-21 09:30:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2018-62 
Volume (vol) vol.118 
Number (no) no.218 
Page pp.17-21 
#Pages 5 
Date of Issue 2018-09-13 (MW) 

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