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Paper Abstract and Keywords
Presentation 2010-07-30 10:50
Gain and Bandwidth Tunable Multi-Band Differential Amplifiers
Yasushi Itoh, Kazuyoshi Sakamoto, Wei Cao, Keita Sakurai, Toshihiko Murata (Shonan Inst. of Tech.) MW2010-60 OPE2010-45
Abstract (in Japanese) (See Japanese page) 
(in English) An L-band gain and bandwidth tunable low-noise differential amplifier has been developed for the next generation reconfigurable wireless radios. It employs a varactor-tuned base bias circuit for tuning a lower band-edge frequency of the amplifier, a varactor-tuned collector bias circuit for tuning a higher band-edge frequency of the amplifier, an active load for a fine tuning of gain, and a cascode HBT for a coarse tuning of gain. With the use of the varactor-tuned bias circuits, the lower band-edge frequency can be varied from 0.3 to 0.8 GHz for a fixed higher band-edge frequency of 1.7 GHz. On the other hand, the higher band-edge frequency can be varied from 0.7 to 1.7 GHz for a fixed lower band-edge frequency of 0.3 GHz. With the use of an active load and a cascode HBT, a fine tuning range of gain up to 2.8 dB over 1.3 to 1.5 GHz and a coarse tuning range of gain up to 23 dB across 0.7 to 1.5 GHz have been successfully achieved. Since the frequency response including lower and higher band-edge frequencies as well as gain level can be tuned independently, the amplifier is considered to greatly contribute to realizing the next generation reconfigurable wireless transceivers.
Keyword (in Japanese) (See Japanese page) 
(in English) microwaves / differential amplifier / tunable gain / tunable bandwidth / SiGe HBT / active load / cascode BJT /  
Reference Info. IEICE Tech. Rep., vol. 110, no. 155, MW2010-60, pp. 193-197, July 2010.
Paper # MW2010-60 
Date of Issue 2010-07-22 (MW, OPE) 
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 MW2010-60 OPE2010-45

Conference Information
Committee EMT OPE MW IEE-EMT  
Conference Date 2010-07-29 - 2010-07-30 
Place (in Japanese) (See Japanese page) 
Place (in English) Hokkaido Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To MW 
Conference Code 2010-07-EMT-OPE-MW-EMT 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Gain and Bandwidth Tunable Multi-Band Differential Amplifiers 
Sub Title (in English)  
Keyword(1) microwaves  
Keyword(2) differential amplifier  
Keyword(3) tunable gain  
Keyword(4) tunable bandwidth  
Keyword(5) SiGe HBT  
Keyword(6) active load  
Keyword(7) cascode BJT  
Keyword(8)  
1st Author's Name Yasushi Itoh  
1st Author's Affiliation Shonan Institute of Technology (Shonan Inst. of Tech.)
2nd Author's Name Kazuyoshi Sakamoto  
2nd Author's Affiliation Shonan Institute of Technology (Shonan Inst. of Tech.)
3rd Author's Name Wei Cao  
3rd Author's Affiliation Shonan Institute of Technology (Shonan Inst. of Tech.)
4th Author's Name Keita Sakurai  
4th Author's Affiliation Shonan Institute of Technology (Shonan Inst. of Tech.)
5th Author's Name Toshihiko Murata  
5th Author's Affiliation Shonan Institute of Technology (Shonan Inst. of Tech.)
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Speaker Author-1 
Date Time 2010-07-30 10:50:00 
Presentation Time 25 minutes 
Registration for MW 
Paper # MW2010-60, OPE2010-45 
Volume (vol) vol.110 
Number (no) no.155(MW), no.156(OPE) 
Page pp.193-197 
#Pages 5 
Date of Issue 2010-07-22 (MW, OPE) 

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