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IEICE Trans

Koji TSUTSUMI

Variable-Gain Phase Shifter with Phase Compensation Using Varactors
Akihito HIRAI Yuki TSUKUI Koji TSUTSUMI Kazutomi MORI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2023/11/01
Vol. E106-C  No. 11  pp. 677-688
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
vector-sum, variable-gain, phase shifter, phase compensation, 
 Summary | Full Text:PDF
A 0.3-to-5.5 GHz Digital Frequency Discriminator IC with Time to Digital Converter and Edge Counter for Instantaneous Frequency Measurement
Akihito HIRAI Koji TSUTSUMI Hideyuki NAKAMIZO Eiji TANIGUCHI Kenichi TAJIMA Kazutomi MORI Masaomi TSURU Mitsuhiro SHIMOZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2019/07/01
Vol. E102-C  No. 7  pp. 547-557
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
Category: 
Keyword: 
digital frequency discriminator (DFD), instantaneous frequency measurement (IFM), time-to-digital converter (TDC), multiphase clock, 
 Summary | Full Text:PDF
A Compact RF Frontend Module of Active Phased Array Antenna for High SHF Wideband Massive MIMO in 5G
Hideyuki NAKAMIZO Shintaro SHINJO Koji TSUTSUMI Satoshi YAMAGUCHI Hideharu YOSHIOKA Akihiro OKAZAKI Akinori TAIRA Kenichi TAJIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2017/10/01
Vol. E100-C  No. 10  pp. 818-824
Type of Manuscript:  INVITED PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
massive MIMO, active phased array antenna, high SHF, RF frontend, 5G, 
 Summary | Full Text:PDF
A 15GHz-Band 4-Channel Transmit/Receive RF Core-Chip for High SHF Wide-Band Massive MIMO in 5G
Koji TSUTSUMI Takaya MARUYAMA Wataru YAMAMOTO Takanobu FUJIWARA Tatsuya HAGIWARA Ichiro SOMADA Eiji TANIGUCHI Mitsuhiro SHIMOZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2017/10/01
Vol. E100-C  No. 10  pp. 825-832
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
massive MIMO, active phased array antenna, high SHF, phase shifters, variable gain amplifiers, CMOS integrated circuits, 
 Summary | Full Text:PDF
Adaptively Phase-Shift Controlled Self-Injection Locked VCO
Masaomi TSURU Kengo KAWASAKI Koji TSUTSUMI Eiji TANIGUCHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/07/01
Vol. E98-C  No. 7  pp. 677-684
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Active Circuits/Devices/Monolithic Microwave Integrated Circuits
Keyword: 
self-injection locked oscillator, phase noise, delay lines, phase-shift control, 
 Summary | Full Text:PDF
0.4-5.8 GHz SiGe-MMIC Quadrature Modulator Employing Self Current Controlled Mixer for Cognitive Radio
Shintaro SHINJO Fumiki ONOMA Koji TSUTSUMI Noriharu SUEMATSU Mitsuhiro SHIMOZAWA Hiroshi HARADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3701-3710
Type of Manuscript:  Special Section PAPER (Special Section on Dynamic Spectrum Access)
Category: Wideband RF Systems
Keyword: 
microwave, MMIC transmitters, MMIC mixers, mobile communication, modulation, wireless LAN, 
 Summary | Full Text:PDF