Mutsuyuki OTSUBO

High Efficiency AlGaAs/GaAs Power HBTs at a Low Supply Voltage for Digital Cellular Phones
Teruyuki SHIMURA Takeshi MIURA Yutaka UNEME Hirofumi NAKANO Ryo HATTORI Mutsuyuki OTSUBO Kazutomi MORI Akira INOUE Noriyuki TANINO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1997/06/25
Vol. E80-C  No. 6  pp. 740-745
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeterwave High-power Devices)
Category: 
Keyword: 
heterojunction bipolar transistor, digital cellular phone, individual thermal shunt, emitter air-bridge, bias mode, 
 Summary | Full Text:PDF(588.7KB)
A New GaAs Negative Voltage Generator for a Power Amplifier Applied to a Single-Chip T/R-MMIC Front-End
Kazuya YAMAMOTO Kosei MAEMURA Nobuyuki KASAI Yutaka YOSHII Yukio MIYAZAKI Masatoshi NAKAYAMA Noriko OGATA Tadashi TAKAGI Mutsuyuki OTSUBO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1996/12/25
Vol. E79-C  No. 12  pp. 1741-1750
Type of Manuscript:  PAPER
Category: Semiconductor Materials and Devices
Keyword: 
negative voltage generator, GaAs MESFET, power amplifire, MMIC front-end, 
 Summary | Full Text:PDF(1MB)
A Multi Phase-States MMIC Phase Shifter
Kazuhiko NAKAHARA Shin CHAKI Naoto ANDOH Hiroshi MATSUOKA Noriyuki TANINO Yasuo MITSUI Mutsuyuki OTSUBO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1996/05/25
Vol. E79-C  No. 5  pp. 650-656
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave Devices for Mobile Communications)
Category: Active Devices
Keyword: 
reflection type, loaded-line type, phase shifter, phase state, switching FET, 
 Summary | Full Text:PDF(559.3KB)
Focused Ion Beam Trimming Techniques for MMIC Circuit Optimization
Takahide ISHIKAWA Makio KOMARU Kazuhiko ITOH Katsuya KOSAKI Yasuo MITSUI Mutsuyuki OTSUBO Shigeru MITSUI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1993/06/25
Vol. E76-C  No. 6  pp. 891-900
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeter-Wave Technology for Advanced Functions and Size-Reductions)
Category: 
Keyword: 
FIB (Focused Ion Beam), trimming, circuit optimization, MMIC, 
 Summary | Full Text:PDF(1022.9KB)