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Paper Abstract and Keywords
Presentation 2020-11-19 14:20
Gain improvement of a 130 GHz CMOS amplifier by using radial stub as AC ground
Taiki Machii, Mizuki Motoyoshi, Suguru Kameda, Noriharu Suematsu (Tohoku Univ.) MW2020-68 Link to ES Tech. Rep. Archives: MW2020-68
Abstract (in Japanese) (See Japanese page) 
(in English) Low-loss matching circuit is an important issue since sufficient gain cannot be achieved with over-100 GHz CMOS amplifiers. In the case of matching circuit with short stub, the short stub should be terminated to the ground. Since the matching circuit is applied DC bias to operate the FET of amplifier, the ground should not be directly connected the ground (DC ground) but should be AC ground. AC ground with MIM capacitor is widely used in microwave frequency range, but 1/4 g open stub is used for over-100 GHz amplifier to reduce the loss of the AC ground. In this paper, we examine the losses of open stub using low-impedance line and radial stub. Theoretical analysis based on the series resistance of the conductor, EM simulation which take into account conductor loss and dielectric loss, and the measurement of fabricated stubs show the superiority of the radial stub than the open stub. The fabricated 130 GHz CMOS amplifiers having an input and an output matching circuits with radial stubs show higher gain than that with open stubs.
Keyword (in Japanese) (See Japanese page) 
(in English) CMOS / Amplifiers / Radial stub / Open stub / Millimeter-wave / RFICs / D-band /  
Reference Info. IEICE Tech. Rep., vol. 120, no. 240, MW2020-68, pp. 18-22, Nov. 2020.
Paper # MW2020-68 
Date of Issue 2020-11-12 (MW) 
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)
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Conference Information
Committee MW  
Conference Date 2020-11-19 - 2020-11-19 
Place (in Japanese) (See Japanese page) 
Place (in English) Online 
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Topics (in English)  
Paper Information
Registration To MW 
Conference Code 2020-11-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Gain improvement of a 130 GHz CMOS amplifier by using radial stub as AC ground 
Sub Title (in English)  
Keyword(1) CMOS  
Keyword(2) Amplifiers  
Keyword(3) Radial stub  
Keyword(4) Open stub  
Keyword(5) Millimeter-wave  
Keyword(6) RFICs  
Keyword(7) D-band  
1st Author's Name Taiki Machii  
1st Author's Affiliation Tohoku University (Tohoku Univ.)
2nd Author's Name Mizuki Motoyoshi  
2nd Author's Affiliation Tohoku University (Tohoku Univ.)
3rd Author's Name Suguru Kameda  
3rd Author's Affiliation Tohoku University (Tohoku Univ.)
4th Author's Name Noriharu Suematsu  
4th Author's Affiliation Tohoku University (Tohoku Univ.)
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Speaker Author-1 
Date Time 2020-11-19 14:20:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2020-68 
Volume (vol) vol.120 
Number (no) no.240 
Page pp.18-22 
Date of Issue 2020-11-12 (MW) 

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