Ryuichi FUJIMOTO


An 18 µW Spur Cancelled Clock Generator for Recovering Receiver Sensitivity in Wireless SoCs
Yosuke OGASAWARA Ryuichi FUJIMOTO Tsuneo SUZUKI Kenichi SAMI 
Publication:   
Publication Date: 2017/06/01
Vol. E100-C  No. 6  pp. 529-538
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
Category: 
Keyword: 
spurclock spurSCCGSSCGBLEsensitivity recoveryclock generationsystem on chip
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Analog and Digital Collaborative Design Techniques for Wireless SoCs
Ryuichi FUJIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/02/01
Vol. E99-A  No. 2  pp. 514-522
Type of Manuscript:  INVITED PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
wirelessSoCISDB-T1-segmant broadcastingTransferJetWireless LANspurious signaldigital pre-distortionmismatch calibrationlow power consumption
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FOREWORD
Ryuichi FUJIMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2013/06/01
Vol. E96-C  No. 6  pp. 757-758
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF

A -70 dBm-Sensitivity 522 Mbps 0.19 nJ/bit-TX 0.43 nJ/bit-RX Transceiver for TransferJetTM SoC in 65 nm CMOS
Daisuke MIYASHITA Kenichi AGAWA Hirotsugu KAJIHARA Kenichi SAMI Ichiro SETO Ryuichi FUJIMOTO Yasuo UNEKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2013/06/01
Vol. E96-C  No. 6  pp. 783-789
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
TransferJetTMDSSS-UWBroot raised cosine filterISI
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A 120 GHz/140 GHz Dual-Channel OOK Receiver Using 65 nm CMOS Technology
Ryuichi FUJIMOTO Mizuki MOTOYOSHI Kyoya TAKANO Minoru FUJISHIMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/02/01
Vol. E96-A  No. 2  pp. 486-493
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
millimeter waveD-banddual-bandOOK modulationReceiverCMOSBERdata ratesensitivitychannel selection
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A 120-GHz Transmitter and Receiver Chipset with 9-Gbps Data Rate Using 65-nm CMOS Technology
Ryuichi FUJIMOTO Mizuki MOTOYOSHI Kyoya TAKANO Uroschanit YODPRASIT Minoru FUJISHIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/07/01
Vol. E95-C  No. 7  pp. 1154-1162
Type of Manuscript:  Special Section PAPER (Special Section on Recent Trends of Microwave Systems and Their Fundamental Technologies)
Category: 
Keyword: 
millimeter waveOOK modulationtransceiverCMOS
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Bias-Voltage-Dependent Subcircuit Model for Millimeter-Wave CMOS Circuit
Kosuke KATAYAMA Mizuki MOTOYOSHI Kyoya TAKANO Ryuichi FUJIMOTO Minoru FUJISHIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/06/01
Vol. E95-C  No. 6  pp. 1077-1085
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
parameter extractionMOSFET modelingmillimeter wave
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A-104 dBc/Hz In-Band Phase Noise 3 GHz All Digital PLL with Phase Interpolation Based Hierarchical Time to Digital Converter
Daisuke MIYASHITA Hiroyuki KOBAYASHI Jun DEGUCHI Shouhei KOUSAI Mototsugu HAMADA Ryuichi FUJIMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/06/01
Vol. E95-C  No. 6  pp. 1008-1016
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
ADPLLTDCphase interpolatorphase noise
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Analysis of De-Embedding Error Cancellation in Cascade Circuit Design
Kyoya TAKANO Ryuichi FUJIMOTO Kosuke KATAYAMA Mizuki MOTOYOSHI Minoru FUJISHIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/10/01
Vol. E94-C  No. 10  pp. 1641-1649
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Measurement Techniques
Keyword: 
de-embeddingTRLcascade circuit
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A Single-Chip RF Tuner/OFDM Demodulator for Mobile Digital TV Application
Yoshimitsu TAKAMATSU Ryuichi FUJIMOTO Tsuyoshi SEKINE Takaya YASUDA Mitsumasa NAKAMURA Takuya HIRAKAWA Masato ISHII Motohiko HAYASHI Hiroya ITO Yoko WADA Teruo IMAYAMA Tatsuro OOMOTO Yosuke OGASAWARA Masaki NISHIKAWA Yoshihiro YOSHIDA Kenji YOSHIOKA Shigehito SAIGUSA Hiroshi YOSHIDA Nobuyuki ITOH 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/04/01
Vol. E94-C  No. 4  pp. 557-566
Type of Manuscript:  Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
digital TV1-segment broadcastingISDB-Ttunablelow-noise amplifierspurious signalprescalerPLL
 Summary | Full Text:PDF

Device Modeling Techniques for High-Frequency Circuits Design Using Bond-Based Design at over 100 GHz
Ryuichi FUJIMOTO Kyoya TAKANO Mizuki MOTOYOSHI Uroschanit YODPRASIT Minoru FUJISHIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/04/01
Vol. E94-C  No. 4  pp. 589-597
Type of Manuscript:  Special Section PAPER (Special Section on Circuits and Design Techniques for Advanced Large Scale Integration)
Category: 
Keyword: 
millimeter wavedevice modelMOSFETtransmission linepadbond-based design
 Summary | Full Text:PDF

A 60-GHz Phase-Locked Loop with Inductor-Less Wide Operation Range Prescaler in 90-nm CMOS
Hiroaki HOSHINO Ryoichi TACHIBANA Toshiya MITOMO Naoko ONO Yoshiaki YOSHIHARA Ryuichi FUJIMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2009/06/01
Vol. E92-C  No. 6  pp. 785-791
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
PLLsynthesizerVCOILFDphase noise
 Summary | Full Text:PDF

A Low-Noise Amplifier for WCDMA Terminal with High Tolerance for Leakage Signal from Transmitter
Ryuichi FUJIMOTO Gaku TAKEMURA Masato ISHII Takehiko TOYODA Hiroshi TSURUMI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/02/01
Vol. E91-A  No. 2  pp. 521-528
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
low-noise amplifierLNAWCDMATX leakage signalnoise frequency conversionnoise figure NF
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A Quadrature Demodulator for WCDMA Receiver Using Common-Base Input Stage with Robustness to Transmitter Leakage
Toshiya MITOMO Osamu WATANABE Ryuichi FUJIMOTO Shunji KAWAGUCHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/06/01
Vol. E90-C  No. 6  pp. 1241-1246
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
WCDMA receiverdirect conversionquadrature demodulatorcommon-base circuit
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A Low LO Leakage and Low Power LO Buffer for Direct-Conversion Quadrature Demodulator
Toshiya MITOMO Osamu WATANABE Shoji OTAKA Ryuichi FUJIMOTO Shunji KAWAGUCHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/06/01
Vol. E88-C  No. 6  pp. 1212-1217
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: RF
Keyword: 
LO bufferquadrature demodulatordirect-conversionself mixingDC offset
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A Direct Conversion Receiver for W-CDMA Reducing Current Consumption to 31 mA
Hiroshi YOSHIDA Takehiko TOYODA Makoto ARAI Ryuichi FUJIMOTO Toshiya MITOMO Masato ISHII Rui ITO Tadashi ARAI Tetsuro ITAKURA Hiroshi TSURUMI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/06/01
Vol. E88-C  No. 6  pp. 1271-1274
Type of Manuscript:  Special Section LETTER (Special Section on Analog Circuit and Device Technologies)
Category: RF
Keyword: 
direct conversionpower consumptionW-CDMA
 Summary | Full Text:PDF

Fully Differential Direct-Conversion Receiver for W-CDMA Reducing DC-Offset Variation
Hiroshi YOSHIDA Takehiko TOYODA Ichiro SETO Ryuichi FUJIMOTO Osamu WATANABE Tadashi ARAI Tetsuro ITAKURA Hiroshi TSURUMI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/06/01
Vol. E87-C  No. 6  pp. 901-908
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: 
Keyword: 
direct conversionDC offset cancelerharmonic mixer
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A Simple Modeling Technique for Symmetric Inductors
Ryuichi FUJIMOTO Chihiro YOSHINO Tetsuro ITAKURA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/06/01
Vol. E86-C  No. 6  pp. 1093-1097
Type of Manuscript:  Special Section LETTER (Special Issue on Devices and Circuits for Next Generation Multi-Media Communication Systems)
Category: 
Keyword: 
symmetric inductordevice model parameterdifferential modecommon mode
 Summary | Full Text:PDF

High-Frequency Device-Modeling Techniques for RF-CMOS Circuits
Ryuichi FUJIMOTO Osamu WATANABE Fumie FUJII Hideyuki KAWAKITA Hiroshi TANIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/02/01
Vol. E84-A  No. 2  pp. 520-528
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques Supporting the System LSI Era)
Category: 
Keyword: 
device modelmodel parameterscalinggeometric parameterprocess parameter
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A Low Offset 1.9-GHz Direct Conversion Receiver IC with Spurious Free Dynamic Range of over 67 dB
Shoji OTAKA Takafumi YAMAJI Ryuichi FUJIMOTO Hiroshi TANIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/02/01
Vol. E84-A  No. 2  pp. 513-519
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques Supporting the System LSI Era)
Category: 
Keyword: 
direct conversion receiverdouble balanced mixervariable gain amplifieron-chip balun90 phase-shifter
 Summary | Full Text:PDF

A 1.9-GHz Direct Conversion Transmitter IC with Low Power On-Chip Frequency Doubler
Shoji OTAKA Ryuichi FUJIMOTO Hiroshi TANIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/02/25
Vol. E82-A  No. 2  pp. 313-319
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
frequency doublerquadrature modulatorvariable attenuatortransmitterPHS(Personal Handy-Phone System)90phase-shifterECL-EXOR
 Summary | Full Text:PDF

A 1. 5 GHz CMOS Low Noise Amplifier
Ryuichi FUJIMOTO Shoji OTAKA Hiroshi IWAI Hiroshi TANIMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/03/25
Vol. E81-A  No. 3  pp. 382-388
Type of Manuscript:  Special Section PAPER (Special Section of Selected Papers from the 10th Karuizawa Workshop on Circuits and Systems)
Category: 
Keyword: 
low noise amplifierCMOS technologyshort channelinductorhigh frequency circuit
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1.9 GHz Si Direct Conversion Receiver IC for QPSK Modulation Systems
Chikau TAKAHASHI Ryuichi FUJIMOTO Satoshi ARAI Tetsuro ITAKURA Takashi UENO Hiroshi TSURUMI Hiroshi TANIMOTO Shuji WATANABE Kenji HIRAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1996/05/25
Vol. E79-C  No. 5  pp. 644-649
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave Devices for Mobile Communications)
Category: Active Devices
Keyword: 
direct conversion receiver2nd-order distortionQPSK
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A Hierarchical Structure in Homoclinic Bifurcations
Ryuichi FUJIMOTO Motomasa KOMURO Ryuji TOKUNAGA Takashi MATSUMOTO 
Publication:   IEICE TRANSACTIONS (1976-1990)
Publication Date: 1990/06/25
Vol. E73-E  No. 6  pp. 809-816
Type of Manuscript:  Special Section PAPER (Special Issue on Engineering Chaos)
Category: Chaos in Electrical Circuits
Keyword: 
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