Akira FUJIMAKI


Energy/Space-Efficient Rapid Single-Flux-Quantum Circuits by Using π-Shifted Josephson Junctions
Tomohiro KAMIYA Masamitsu TANAKA Kyosuke SANO Akira FUJIMAKI 
Publication:   
Publication Date: 2018/05/01
Vol. E101-C  No. 5  pp. 385-390
Type of Manuscript:  Special Section PAPER (Special Section on Innovative Superconducting Devices Based on New Physical Phenomena)
Category: 
Keyword: 
energy-efficient circuitπ-shifted Josephson junctionsrapid single-flux-quantumsuperconducting spintronics
 Summary | Full Text:PDF(711.2KB)

Thermally Assisted Superconductor Transistors for Josephson-CMOS Hybrid Memories
Kyosuke SANO Masato SUZUKI Kohei MARUYAMA Soya TANIGUCHI Masamitsu TANAKA Akira FUJIMAKI Masumi INOUE Nobuyuki YOSHIKAWA 
Publication:   
Publication Date: 2018/05/01
Vol. E101-C  No. 5  pp. 370-377
Type of Manuscript:  INVITED PAPER (Special Section on Innovative Superconducting Devices Based on New Physical Phenomena)
Category: 
Keyword: 
nanodevicesthermally assisted devicesingle-flux-quantum logicsuperconducting integrated circuits
 Summary | Full Text:PDF(1.4MB)

Development of an Advanced Circuit Model for Superconducting Strip Line Detector Arrays
Ali BOZBEY Yuma KITA Kyohei KAMIYA Misaki KOZAKA Masamitsu TANAKA Takekazu ISHIDA Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/06/01
Vol. E99-C  No. 6  pp. 676-682
Type of Manuscript:  INVITED PAPER (Special Section on Cutting-Edge Technologies of Superconducting Electronics)
Category: 
Keyword: 
SSLDkinetic inductance detectorsSFQsuperconductorsneutron detector
 Summary | Full Text:PDF(1.2MB)

FOREWORD
Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/06/01
Vol. E99-C  No. 6  pp. 667-668
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(61.3KB)

Nb 9-Layer Fabrication Process for Superconducting Large-Scale SFQ Circuits and Its Process Evaluation
Shuichi NAGASAWA Kenji HINODE Tetsuro SATOH Mutsuo HIDAKA Hiroyuki AKAIKE Akira FUJIMAKI Nobuyuki YOSHIKAWA Kazuyoshi TAKAGI Naofumi TAKAGI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 132-140
Type of Manuscript:  INVITED PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
superconducting fabrication technologyNb/AlOx/Nb Josephson junctionsingle flux quantumplanarizationshift register
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High-Speed Operation of 0.25-mV RSFQ Arithmetic Logic Unit Based on 10-kA/cm2 Nb Process Technology
Masamitsu TANAKA Atsushi KITAYAMA Masakazu OKADA Tomohito KOUKETSU Takumi TAKINAMI Masato ITO Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 166-172
Type of Manuscript:  Special Section PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
single-flux-quantum logiclow-powerlow-voltagedigital arithmetic
 Summary | Full Text:PDF(1.5MB)

A Reconfigurable Data-Path Accelerator Based on Single Flux Quantum Circuits
Hiroshi KATAOKA Hiroaki HONDA Farhad MEHDIPOUR Nobuyuki YOSHIKAWA Akira FUJIMAKI Hiroyuki AKAIKE Naofumi TAKAGI Kazuaki MURAKAMI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 141-148
Type of Manuscript:  INVITED PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
single flux quantumreconfigurable data-pathaccelerator
 Summary | Full Text:PDF(2MB)

Design and High-Speed Demonstration of Single-Flux-Quantum Bit-Serial Floating-Point Multipliers Using a 10kA/cm2 Nb Process
Xizhu PENG Yuki YAMANASHI Nobuyuki YOSHIKAWA Akira FUJIMAKI Naofumi TAKAGI Kazuyoshi TAKAGI Mutsuo HIDAKA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 188-193
Type of Manuscript:  Special Section PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
floating point unitmultiplierLSRDPSFQ circuitsuperconductive integrated circuit
 Summary | Full Text:PDF(2.2MB)

Large-Scale Integrated Circuit Design Based on a Nb Nine-Layer Structure for Reconfigurable Data-Path Processors
Akira FUJIMAKI Masamitsu TANAKA Ryo KASAGI Katsumi TAKAGI Masakazu OKADA Yuhi HAYAKAWA Kensuke TAKATA Hiroyuki AKAIKE Nobuyuki YOSHIKAWA Shuichi NAGASAWA Kazuyoshi TAKAGI Naofumi TAKAGI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/03/01
Vol. E97-C  No. 3  pp. 157-165
Type of Manuscript:  INVITED PAPER (Special Section on Leading-Edge Technology of Superconductor Large-Scale Integrated Circuits)
Category: 
Keyword: 
advanced processcell-based design techniquehigh-end computinglarge-scale integrationrapid single-flux-quantum circuits
 Summary | Full Text:PDF(2.3MB)

Proposal of a Compact Neutron Diffraction System with a Single-Flux-Quantum Signal Processor
Akira FUJIMAKI Isao NAKANISHI Shigeyuki MIYAJIMA Kohei ARAI Yukio AKITA Takekazu ISHIDA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/03/01
Vol. E94-C  No. 3  pp. 254-259
Type of Manuscript:  INVITED PAPER (Special Section on Superconducting Signal Processing Technologies)
Category: 
Keyword: 
neutrondiffractionsingle flux quantumtime-to-digital convertertime-of-flight
 Summary | Full Text:PDF(1.7MB)

NbN Josephson Junctions for Single-Flux-Quantum Circuits
Hiroyuki AKAIKE Naoto NAITO Yuki NAGAI Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/03/01
Vol. E94-C  No. 3  pp. 301-306
Type of Manuscript:  Special Section PAPER (Special Section on Superconducting Signal Processing Technologies)
Category: 
Keyword: 
NbNJosephson junctionsself-shuntedAlNxradical-nitridation
 Summary | Full Text:PDF(1003.4KB)

Automated Passive-Transmission-Line Routing Tool for Single-Flux-Quantum Circuits Based on A* Algorithm
Masamitsu TANAKA Koji OBATA Yuki ITO Shota TAKESHIMA Motoki SATO Kazuyoshi TAKAGI Naofumi TAKAGI Hiroyuki AKAIKE Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 435-439
Type of Manuscript:  Special Section PAPER (Special Section on Frontiers of Superconductive Electronics)
Category: Digital Applications
Keyword: 
single-flux-quantum circuitcomputer-aided designwire routerpassive transmission line
 Summary | Full Text:PDF(970.9KB)

FOREWORD
Akira FUJIMAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 427-428
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(47.3KB)

All MgB2 Josephson Junctions with Amorphous Boron Barriers
Naoki MITAMURA Chikaze MARUYAMA Hiroyuki AKAIKE Akira FUJIMAKI Rintaro ISHII Yoshihiro NIIHARA Michio NAITO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 468-472
Type of Manuscript:  Special Section PAPER (Special Section on Frontiers of Superconductive Electronics)
Category: Junctions
Keyword: 
MgB2Josephson junctionamorphous boron
 Summary | Full Text:PDF(319.6KB)

100 GHz Demonstrations Based on the Single-Flux-Quantum Cell Library for the 10 kA/cm2 Nb Multi-Layer Process
Yuki YAMANASHI Toshiki KAINUMA Nobuyuki YOSHIKAWA Irina KATAEVA Hiroyuki AKAIKE Akira FUJIMAKI Masamitsu TANAKA Naofumi TAKAGI Shuichi NAGASAWA Mutsuo HIDAKA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/04/01
Vol. E93-C  No. 4  pp. 440-444
Type of Manuscript:  Special Section PAPER (Special Section on Frontiers of Superconductive Electronics)
Category: Digital Applications
Keyword: 
single flux quantum circuitJosephson junctioncell libraryadder
 Summary | Full Text:PDF(668.8KB)

Bit-Serial Single Flux Quantum Microprocessor CORE
Akira FUJIMAKI Masamitsu TANAKA Takahiro YAMADA Yuki YAMANASHI Heejoung PARK Nobuyuki YOSHIKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/03/01
Vol. E91-C  No. 3  pp. 342-349
Type of Manuscript:  INVITED PAPER (Special Section on Recent Progress in Superconductive Digital Electronics)
Category: 
Keyword: 
superconductormicroprocessorsingle flux quantumbit-serialLSI
 Summary | Full Text:PDF(929.4KB)

Proposal of a Desk-Side Supercomputer with Reconfigurable Data-Paths Using Rapid Single-Flux-Quantum Circuits
Naofumi TAKAGI Kazuaki MURAKAMI Akira FUJIMAKI Nobuyuki YOSHIKAWA Koji INOUE Hiroaki HONDA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/03/01
Vol. E91-C  No. 3  pp. 350-355
Type of Manuscript:  INVITED PAPER (Special Section on Recent Progress in Superconductive Digital Electronics)
Category: 
Keyword: 
superconductorrapid single-flux-quantum circuitreconfigurable data-pathhigh-performance computingsupercomputer
 Summary | Full Text:PDF(297.2KB)

High-Resolution Analog-to-Digital Converters toward Software-Defined-Radio Receivers
Akira FUJIMAKI Yoshinori NISHIDO Akito SEKIYA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/02/01
Vol. E89-C  No. 2  pp. 113-118
Type of Manuscript:  INVITED PAPER (Special Section on Superconducting High-frequency Devices)
Category: 
Keyword: 
analog-to-digital convertersuperconductorsoftware-defined-radiosingle-flux-quantum
 Summary | Full Text:PDF(599.6KB)

Development of Passive Interconnection Technology for SFQ Circuits
Yoshihito HASHIMOTO Shinichi YOROZU Yoshio KAMEDA Akira FUJIMAKI Hirotaka TERAI Nobuyuki YOSHIKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/02/01
Vol. E88-C  No. 2  pp. 198-207
Type of Manuscript:  INVITED PAPER (Special Section on Superconducting Electronic Devices and Their Applications)
Category: 
Keyword: 
SFQintegrated circuitinterconnectionsuperconductorpassive transmission line
 Summary | Full Text:PDF(1.9MB)

High-End Server Based on Complexity-Reduced Architecture for Superconductor Technology
Akira FUJIMAKI Yoshiaki TAKAI Nobuyuki YOSHIKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Vol. E85-C  No. 3  pp. 612-616
Type of Manuscript:  INVITED PAPER (Special Issue on Superconductive Electronics)
Category: Digital Devices and Their Applications
Keyword: 
SFQmemoryprocessorsuperconducting circuitJAVA
 Summary | Full Text:PDF(350.1KB)

Design and Demonstration of Pipelined Circuits Using SFQ Logic
Akira AKAHORI Akito SEKIYA Takahiro YAMADA Akira FUJIMAKI Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/03/01
Vol. E85-C  No. 3  pp. 641-644
Type of Manuscript:  Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Digital Devices and Their Applications
Keyword: 
SFQpipeline architectureparameter spreadleakage currentparameter optimization method
 Summary | Full Text:PDF(490.6KB)

Bit Error Rate Measurement of a Measuring System Designed for Superconducting Digital Circuits
Kazuhiro SHIMAOKA Seiichi TOKUNAGA Masaaki NEMOTO Isao YOSHIDA Akira FUJIMAKI Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2001/01/01
Vol. E84-C  No. 1  pp. 29-34
Type of Manuscript:  Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Digital Applications
Keyword: 
bit error rate (BER)cryo-coolervector network measurementsuperconductormagnetic shield
 Summary | Full Text:PDF(748KB)

Ramp-Edge Josephson Junctions Using Barriers of Various Resistivities
Masahiro HORIBE Koh-ichi KAWAI Akira FUJIMAKI Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/10/25
Vol. E81-C  No. 10  pp. 1526-1531
Type of Manuscript:  INVITED PAPER (Special Issue on Low- and High-Temperature Superconductive Electron Devices and Their Applications)
Category: High-Tc Junction Technology
Keyword: 
ramp-edge Josephson junctionGa dopingCa dopingdirect tunnelingresonant tunneling
 Summary | Full Text:PDF(604.9KB)

Vortex Flow Transistors Based on YBa2Cu3O7δ Films
Akira FUJIMAKI Masanobu KUSUNOKI Masaru KITO Syuji YOSHIDA Hiroya ANDOH Hisao HAYAKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1996/09/25
Vol. E79-C  No. 9  pp. 1247-1253
Type of Manuscript:  INVITED PAPER (Special Issue on Toward Digital and Analog Applications of Superconductors)
Category: Device technology
Keyword: 
vortex flow transistorAbrikosov vortexnanobridgehigh-temperature superconductor
 Summary | Full Text:PDF(917.3KB)