Kenichi OKADA


A Study of Stability and Phase Noise of Tail Capacitive-Feedback VCOs
Ahmed MUSA  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2013/04/01
Vol. E96-C  No. 4  pp. 577-585
Type of Manuscript: Special Section PAPER (Special Section on Solid-State Circuit Design—Architecture, Circuit, Device and Design Methodology)
Category: 
Keyword: 
VCOclass-Ccapacitive feedbackCMOSstabilityimpulse sensitivity function (ISF)
  Summary |  Full Text:PDF

Inter-Stage Tunable Notch Filter for a Multi-Band WCDMA Receiver
Toshihiko ITO  Masaki KANEMARU  Satoshi FURUYA  Dong TA NGOC HUY  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/11/01
Vol. E95-C  No. 11  pp. 1776-1782
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
CMOSreceivernotch filtertunablereconfigurable
  Summary |  Full Text:PDF

A Wideband Common-Gate Low-Noise Amplifier Using Capacitive Feedback
Toshihiko ITO  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/10/01
Vol. E95-C  No. 10  pp. 1666-1674
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
LNAwidebandCMOScapacitive-cross-couplingcapacitive feedback
  Summary |  Full Text:PDF

A 0.5-V, 0.05-to-3.2 GHz LC-Based Clock Generator for Substituting Ring Oscillators under Low-Voltage Condition
Wei DENG  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/07/01
Vol. E95-C  No. 7  pp. 1285-1296
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
0.5-Vclock generatorfrequency extensionlow-jitterLC-VCO
  Summary |  Full Text:PDF

Evaluation of L-2L De-Embedding Method Considering Misalignment of Contact Position for Millimeter-Wave CMOS Circuit Design
Qinghong BU  Ning LI  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/05/01
Vol. E95-C  No. 5  pp. 942-948
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
misalignmentde-embeddingmillimeter waveL-2L
  Summary |  Full Text:PDF

Two-Stage Band-Selectable CMOS Power Amplifiers Using Inter-Stage Frequency Tuning
JeeYoung HONG  Daisuke IMANISHI  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/02/01
Vol. E95-C  No. 2  pp. 290-296
Type of Manuscript: PAPER
Category: Electronic Circuits
Keyword: 
CMOSpower amplifiertransformer
  Summary |  Full Text:PDF

A 24 dB Gain 51–68 GHz Common Source Low Noise Amplifier Using Asymmetric-Layout Transistors
Ning LI  Keigo BUNSEN  Naoki TAKAYAMA  Qinghong BU  Toshihide SUZUKI  Masaru SATO  Yoichi KAWANO  Tatsuya HIROSE  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/02/01
Vol. E95-A  No. 2  pp. 498-505
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
asymmetric-layoutlow noise amplifiermm-Wave60 GHz
  Summary |  Full Text:PDF

A Dual-Conduction Class-C VCO for a Low Supply Voltage
Kenichi OKADA  You NOMIYAMA  Rui MURAKAMI  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/02/01
Vol. E95-A  No. 2  pp. 506-514
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
VCOclass-Cdual conductionCMOSlow supply voltageimpulse sensitivity function (ISF)
  Summary |  Full Text:PDF

Topology and Design Considerations of 60 GHz CMOS LNAs for Noise Performance Improving
Ning LI  Qinghong BU  Kota MATSUSHITA  Naoki TAKAYAMA  Shogo ITO  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/12/01
Vol. E94-C  No. 12  pp. 1881-1888
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
low noise amplifierCMOSmm-wave integrated circuit60 GHz
  Summary |  Full Text:PDF

Tunable CMOS Power Amplifiers for Reconfigurable Transceivers
JeeYoung HONG  Daisuke IMANISHI  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2394-2401
Type of Manuscript: PAPER
Category: Circuit Theory
Keyword: 
CMOSpower amplifiertunablereconfigurable
  Summary |  Full Text:PDF

Measurement of Integrated PA-to-LNA Isolation on Si CMOS Chip
Ryo MINAMI  JeeYoung HONG  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Vol. E94-C  No. 6  pp. 1057-1060
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
CMOSpower amplifiersubstrate couplingTx leakagemutual coupling
  Summary |  Full Text:PDF

Eigenmode Analysis of Propagation Constant for a Microstrip Line with Dummy Fills on a Si CMOS Substrate
Yuya ONO  Takuichi HIRANO  Kenichi OKADA  Jiro HIROKAWA  Makoto ANDO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Vol. E94-C  No. 6  pp. 1008-1015
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
silicon CMOSmicrostrip linepropagation constantdummy filleigenmode analysisperiodic structuremillimeter wave
  Summary |  Full Text:PDF

A Low-Noise and Highly-Linear Transmitter with Envelope Injection Pre-Power Amplifier for Multi-Mode Radio
Shouhei KOUSAI  Daisuke MIYASHITA  Junji WADATSUMI  Rui ITO  Takahiro SEKIGUCHI  Mototsugu HAMADA  Kenichi OKADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/02/01
Vol. E94-A  No. 2  pp. 592-602
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
multi-mode radiowideband transmitteractive matchingenvelope injection
  Summary |  Full Text:PDF

A De-Embedding Method Using Different-Length Transmission Lines for mm-Wave CMOS Device Modeling
Naoki TAKAYAMA  Kota MATSUSHITA  Shogo ITO  Ning LI  Keigo BUNSEN  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/06/01
Vol. E93-C  No. 6  pp. 812-819
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
de-embeddingS-parameter measurementmm-waveRF CMOStransmission line
  Summary |  Full Text:PDF

A Wide-Tunable LC-Based Voltage-Controlled Oscillator Using a Divide-by-N Injection-Locked Frequency Divider
Shoichi HARA  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/06/01
Vol. E93-C  No. 6  pp. 763-769
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
CMOSVCOdividerinductor
  Summary |  Full Text:PDF

Analysis of Phase Noise Degradation Considering Switch Transistor Capacitances for CMOS Voltage Controlled Oscillators
Rui MURAKAMI  Shoichi HARA  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/06/01
Vol. E93-C  No. 6  pp. 777-784
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
CMOSVCOinductorphase noisequality factormultiple divideswitched capacitor
  Summary |  Full Text:PDF

The Optimum Design Methodology of Low-Phase-Noise LC-VCO Using Multiple-Divide Technique
Shoichi HARA  Rui MURAKAMI  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/02/01
Vol. E93-A  No. 2  pp. 424-430
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
CMOSVCOdividerinductor
  Summary |  Full Text:PDF

Evaluation of a Multi-Line De-Embedding Technique up to 110 GHz for Millimeter-Wave CMOS Circuit Design
Ning LI  Kota MATSUSHITA  Naoki TAKAYAMA  Shogo ITO  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/02/01
Vol. E93-A  No. 2  pp. 431-439
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
CMOS amplifiertransmission linemillimeter wavede-embedding60 GHz
  Summary |  Full Text:PDF

Tunable CMOS LNA Using a Variable Inductor for a Reconfigurable RF Circuit
Hirotaka SUGAWARA  Kenichi OKADA  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/02/01
Vol. E92-A  No. 2  pp. 401-410
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
reconfigurable RFvariable inductorLNAMEMS
  Summary |  Full Text:PDF

Analysis of CMOS Transconductance Amplifiers for Sampling Mixers
Ning LI  Win CHAIVIPAS  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/06/01
Vol. E91-C  No. 6  pp. 871-878
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
Windowed integrationmoving averagetransconductance amplifiersampling mixer
  Summary |  Full Text:PDF

Spatial Sensitivity of Capacitors in Distributed Resonators and Its Application to Fine and Wide Frequency Tuning Digital Controlled Oscillators
Win CHAIVIPAS  Kenichi OKADA  Akira MATSUZAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/06/01
Vol. E91-C  No. 6  pp. 918-927
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
digital controlled oscillatorstransmission linefrequency tuning
  Summary |  Full Text:PDF

Reconfigurable RF CMOS Circuit for Cognitive Radio
Kazuya MASU  Kenichi OKADA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/01/01
Vol. E91-B  No. 1  pp. 10-13
Type of Manuscript: Special Section PAPER (Special Section on Cognitive Radio and Spectrum Sharing Technology)
Category: INVITED
Keyword: 
CMOSreconfigurable RF circuitcognitive radio
  Summary |  Full Text:PDF

Low-Loss Distributed Constant Passive Devices Using Wafer-Level Chip Scale Package Technology
Hiroyuki ITO  Hideyuki SUGITA  Kenichi OKADA  Tatsuya ITO  Kazuhisa ITOI  Masakazu SATO  Ryozo YAMAUCHI  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/03/01
Vol. E90-C  No. 3  pp. 641-643
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
wafer-level chip scale packageRF CMOSpassive device
  Summary |  Full Text:PDF

Statistical Modeling of a Via Distribution for Yield Estimation
Takumi UEZONO  Kenichi OKADA  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/12/01
Vol. E89-A  No. 12  pp. 3579-3584
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Interconnect
Keyword: 
via distributionyield estimationwire length distribution
  Summary |  Full Text:PDF

RF Passive Components Using Metal Line on Si CMOS
Kazuya MASU  Kenichi OKADA  Hiroyuki ITO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/06/01
Vol. E89-C  No. 6  pp. 681-691
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: INVITED
Keyword: 
Si CMOSon-chip passiveinterconnecttransmission lineinductorvariable inductorreconfigurable RF circuit
  Summary |  Full Text:PDF

Circuit Performance Prediction Considering Core Utilization with Interconnect Length Distribution Model
Hidenari NAKASHIMA  Junpei INOUE  Kenichi OKADA  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/12/01
Vol. E88-A  No. 12  pp. 3358-3366
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Prediction and Analysis
Keyword: 
interconnectlayout compactionphysical designplacementcore utilization
  Summary |  Full Text:PDF

Wire Length Distribution Model for System LSI
Takanori KYOGOKU  Junpei INOUE  Hidenari NAKASHIMA  Takumi UEZONO  Kenichi OKADA  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/12/01
Vol. E88-A  No. 12  pp. 3445-3452
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Interconnect
Keyword: 
wire length distributioncore utilizationSoClayout-area allocation
  Summary |  Full Text:PDF

Evaluation of X Architecture Using Interconnect Length Distribution
Hidenari NAKASHIMA  Naohiro TAKAGI  Junpei INOUE  Kenichi OKADA  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/12/01
Vol. E88-A  No. 12  pp. 3437-3444
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Interconnect
Keyword: 
X architectureinterconnect length distributionILDRent's ruleall-directional interconnect
  Summary |  Full Text:PDF

Dynamic Communication Zone Control Method on Autonomous Decentralized Based Roadside Network Infrastructure
Masashi HIRAIWA  Hiromitsu ASAKURA  Tateki NARITA  Tomoyuki YASHIRO  Hiroshi SHIGENO  Kenichi OKADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/07/01
Vol. E88-A  No. 7  pp. 1786-1799
Type of Manuscript: Special Section PAPER (Special Section on Multi-dimensional Mobile Information Networks)
Category: Network
Keyword: 
autonomous decentralized system (ADS)intelligent transportation system (ITS)dynamic zone controlcommunication protocoldistributed system
  Summary |  Full Text:PDF

Wide Tuning Range LC-VCO Using Variable Inductor for Reconfigurable RF Circuit
Yoshiaki YOSHIHARA  Hirotaka SUGAWARA  Hiroyuki ITO  Kenichi OKADA  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/02/01
Vol. E88-A  No. 2  pp. 507-512
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
VCOoscillatorvariable inductorreconfigurable RF circuit
  Summary |  Full Text:PDF

Promotion of Multiparty Conference in Collaborative Virtual Environments
Kentaro FUKUI  Kensaku HONDA  Kenichi OKADA 
Publication:   IEICE TRANSACTIONS on Information and Systems
Publication Date: 2004/12/01
Vol. E87-D  No. 12  pp. 2540-2547
Type of Manuscript: Special Section PAPER (Special Section on New Technologies and their Applications of the Internet)
Category: INVITED
Keyword: 
CSCWgroupwareawarenessvirtual realityremote conference
  Summary |  Full Text:PDF

Design Optimization Methodology for On-Chip Spiral Inductors
Kenichi OKADA  Hiroaki HOSHINO  Hidetoshi ONODERA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/06/01
Vol. E87-C  No. 6  pp. 933-941
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: 
Keyword: 
spiral inductorresponse surface methodoptimizationquality factor
  Summary |  Full Text:PDF

High Density Differential Transmission Line Structure on Si ULSI
Hiroyuki ITO  Kenichi OKADA  Kazuya MASU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/06/01
Vol. E87-C  No. 6  pp. 942-948
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: 
Keyword: 
differential transmission lineSi ULSIcrosstalkbus lineinterconnect density
  Summary |  Full Text:PDF

Statistical Gate-Delay Modeling with Intra-Gate Variability
Kenichi OKADA  Kento YAMAOKA  Hidetoshi ONODERA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/12/01
Vol. E86-A  No. 12  pp. 2914-2922
Type of Manuscript: Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Parasitics and Noise
Keyword: 
intra-chip variabilitystatistical timing analysisintra-gate variabilitymanufacturing fluctuation
  Summary |  Full Text:PDF

Realistic Delay Calculation Based on Measured Intra-Chip and Inter-Chip Variabilities with the Size Dependence
Kenichi OKADA  Hidetoshi ONODERA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/04/01
Vol. E86-A  No. 4  pp. 746-751
Type of Manuscript: Special Section PAPER (Special Section of Selected Papers from the 15th Workshop on Circuits and Systems in Karuizawa)
Category: 
Keyword: 
intra-chip variabilitystatistical timing analysismanufacturing fluctuation
  Summary |  Full Text:PDF

Statistical Modeling of Device Characteristics with Systematic Variability
Kenichi OKADA  Hidetoshi ONODERA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2001/02/01
Vol. E84-A  No. 2  pp. 529-536
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques Supporting the System LSI Era)
Category: 
Keyword: 
MOSFETvariabilitysystematicstochastic
  Summary |  Full Text:PDF

Layout Dependent Matching Analysis of CMOS Circuits
Kenichi OKADA  Hidetoshi ONODERA  Keikichi TAMARU 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/02/20
Vol. E82-A  No. 2  pp. 348-355
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
CMOSmatchingmicro-loading-effectfluctuation
  Summary |  Full Text:PDF