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Paper Abstract and Keywords
Presentation 2008-07-25 09:50
Differential Variable Gain Amplifiers Using Bridged-T Attenuator Circuits
Kazuyoshi Sakamoto, Masaki Shirata, Kenji Nakamura, Yasushi Itoh (Shonan IT) MW2008-74 OPE2008-57 Link to ES Tech. Rep. Archives: MW2008-74 OPE2008-57
Abstract (in Japanese) (See Japanese page) 
(in English) An L-band digitally-controlled, variable gain differential amplifier (VGA) is presented. It employs a bridged-T attenuator circuit between emitters of the differential pair and achieves a gain variation of 1 dB, 2 dB, 4 dB, and 8 dB by switching an attenuation level. By cascading the 4-bit VGAs, the maximum gain variation of 16 dB with 1 dB step can be realized. The implemented 0.35 m SiGe HBT digitally-controlled VGA demonstrates a gain variation from -7.4 dB to +9.1 dB with 1 dB step at 1 GHz. The input and output return losses are better than 13 dB and 9.5 dB, respectively. The best noise figure was 3.3 dB. The measured IIP3 are -7 dBm with Vcc = 6 V and Ic = 14.8 mA.
Keyword (in Japanese) (See Japanese page) 
(in English) Differential Amplifier / Variable Gain / SiGe HBT / Microwave / Bridged-T / Attenuator / /  
Reference Info. IEICE Tech. Rep., vol. 108, no. 154, MW2008-74, pp. 151-156, July 2008.
Paper # MW2008-74 
Date of Issue 2008-07-17 (MW, OPE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
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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 MW2008-74 OPE2008-57 Link to ES Tech. Rep. Archives: MW2008-74 OPE2008-57

Conference Information
Committee OPE EMT MW  
Conference Date 2008-07-24 - 2008-07-25 
Place (in Japanese) (See Japanese page) 
Place (in English)  
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To MW 
Conference Code 2008-07-OPE-EMT-MW 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Differential Variable Gain Amplifiers Using Bridged-T Attenuator Circuits 
Sub Title (in English)  
Keyword(1) Differential Amplifier  
Keyword(2) Variable Gain  
Keyword(3) SiGe HBT  
Keyword(4) Microwave  
Keyword(5) Bridged-T  
Keyword(6) Attenuator  
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Keyword(8)  
1st Author's Name Kazuyoshi Sakamoto  
1st Author's Affiliation Shonan Institute of Technology (Shonan IT)
2nd Author's Name Masaki Shirata  
2nd Author's Affiliation Shonan Institute of Technology (Shonan IT)
3rd Author's Name Kenji Nakamura  
3rd Author's Affiliation Shonan Institute of Technology (Shonan IT)
4th Author's Name Yasushi Itoh  
4th Author's Affiliation Shonan Institute of Technology (Shonan IT)
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Speaker Author-1 
Date Time 2008-07-25 09:50:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2008-74, OPE2008-57 
Volume (vol) vol.108 
Number (no) no.154(MW), no.155(OPE) 
Page pp.151-156 
#Pages
Date of Issue 2008-07-17 (MW, OPE) 


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