Kazuya YAMAMOTO


Design and Measurements of Two-Gain-Mode GaAs-BiFET MMIC Power Amplifier Modules with Small Phase Discontinuity for WCDMA Data Communications
Kazuya YAMAMOTO Miyo MIYASHITA Kenji MUKAI Shigeru FUJIWARA Satoshi SUZUKI Hiroaki SEKI 
Publication:   
Publication Date: 2018/01/01
Vol. E101-C  No. 1  pp. 65-77
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
WCDMAMMICstep attenuatortwo gain modesdirectional couplerheterojunction bipolar transistors (HBTs)
 Summary | Full Text:PDF(2.3MB)

Experimental Study on CDMA GaAs HBT MMIC Power Amplifier Layout Design for Reducing Turn-On Delay in Transient Response
Kazuya YAMAMOTO Miyo MIYASHITA Takayuki MATSUZUKA Tomoyuki ASADA Kazunobu FUJII Satoshi SUZUKI Teruyuki SHIMURA Hiroaki SEKI 
Publication:   
Publication Date: 2017/06/01
Vol. E100-C  No. 6  pp. 618-631
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
heterojunction bipolar transistors (HBTs)MMICCDMAparallel-amplifier-chain topologytransient responsethermal coupling
 Summary | Full Text:PDF(3.8MB)

Design and Measurements of Building Blocks Supporting a 1.9-GHz-Band BiFET MMIC Power Amplifier for WCDMA Handsets
Kazuya YAMAMOTO Takayuki MATSUZUKA Miyo MIYASHITA Kenichi HORIGUCHI Shigeo YAMABE Satoshi SUZUKI Hiroaki SEKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/07/01
Vol. E99-C  No. 7  pp. 837-848
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
MMICreference voltage generatorESD protectionthree power modesheterojunction bipolar transistors (HBTs)WCDMA
 Summary | Full Text:PDF(1.8MB)

A Current-Mirror-Based GaAs-HBT RF Power Detector Suitable for Base Terminal Monitoring in an HBT Power Stage
Kazuya YAMAMOTO Hitoshi KURUSU Miyo MIYASHTA Satoshi SUZUKI Hiroaki SEKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/12/01
Vol. E98-C  No. 12  pp. 1150-1160
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
power detectorcurrent-mirror circuitsheterojunction bipolar transistors (HBTs)WiMAXMMIC
 Summary | Full Text:PDF(4.2MB)

0.8-/1.5-GHz-Band WCDMA HBT MMIC Power Amplifiers with an Analog Bias Control Scheme
Kazuya YAMAMOTO Takayuki MATSUZUKA Miyo MIYASHITA Kenichi MAEDA Satoshi SUZUKI Hiroaki SEKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/09/01
Vol. E98-C  No. 9  pp. 934-945
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
analog bias controlemitter followercurrent injectionheterojunction bipolar transistors (HBTs)WCDMA
 Summary | Full Text:PDF(3.9MB)

A 3.5-GHz-Band GaAs HBT Stage-Bypass-Type Step-Gain Amplifier Using Base-Collector Diode Switches and Its Application to a WiMAX HBT MMIC Power Amplifier Module
Kazuya YAMAMOTO Miyo MIYASHITA Hitoshi KURUSU Yoshinobu SASAKI Satoshi SUZUKI Hiroaki SEKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/07/01
Vol. E98-C  No. 7  pp. 716-728
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
step gain controldiode switchesheterojunction bipolar transistors (HBTs)WiMAXMMIC
 Summary | Full Text:PDF(4.6MB)

3.5-GHz-Band Low-Bias-Current Operation 0/20-dB Step Linearized Attenuators Using GaAs-HBT Compatible, AC-Coupled, Stack Type Base-Collector Diode Switch Topology
Kazuya YAMAMOTO Miyo MIYASHITA Nobuyuki OGAWA Takeshi MIURA Teruyuki SHIMURA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/07/01
Vol. E90-C  No. 7  pp. 1515-1523
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
wireless LANattenuatordiodesheterojunction bipolar transistors (HBTs)linearityintermodulation distortionlinearizationmonolithic microwave integrated circuit (MMIC)
 Summary | Full Text:PDF(1.1MB)

A GSM/EDGE Dual-Mode, Triple-Band InGaP HBT MMIC Power Amplifier Module
Teruyuki SHIMURA Tomoyuki ASADA Satoshi SUZUKI Takeshi MIURA Jun OTSUJI Ryo HATTORI Yukio MIYAZAKI Kazuya YAMAMOTO Akira INOUE 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/07/01
Vol. E88-C  No. 7  pp. 1495-1501
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
GSM/EDGE dual modepower amplifier moduleInGaP HBTdiode switchRx-noise
 Summary | Full Text:PDF(1.2MB)

Direct Measurement of the Maximum Operating Region in AlGaAs HBTs for RF Power Amplifiers
Akira INOUE Shigenori NAKATSUKA Satoshi SUZUKI Kazuya YAMAMOTO Teruyuki SHIMURA Ryo HATTORI Yasuo MITSUI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/08/01
Vol. E86-C  No. 8  pp. 1451-1457
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: 
Keyword: 
maximum operating regionmeasurementwaveformpower amplifierHBT
 Summary | Full Text:PDF(728.4KB)

2.4-GHz-Band CMOS RF Front-End Building Blocks at a 1.8-V Supply
Hiroshi KOMURASAKI Kazuya YAMAMOTO Hideyuki WAKADA Tetsuya HEIMA Akihiko FURUKAWA Hisayasu SATO Takahiro MIKI Naoyuki KATO Akira HYOGO Keitaro SEKINE 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/02/01
Vol. E85-A  No. 2  pp. 300-308
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
CMOSlow voltageRFS bandfront end
 Summary | Full Text:PDF(1.4MB)

Design and Experimental Results of CMOS Low-Noise/Driver MMIC Amplifiers for Use in 2.4-GHz and 5.2-GHz Wireless Communications
Kazuya YAMAMOTO Tetsuya HEIMA Akihiko FURUKAWA Masayoshi ONO Yasushi HASHIZUME Hiroshi KOMURASAKI Hisayasu SATO Naoyuki KATO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/02/01
Vol. E85-C  No. 2  pp. 400-407
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
Si-bulk CMOSMMIC2.4 GHz5.2-GHzlow-noise/driver amplifier
 Summary | Full Text:PDF(375.1KB)

A Sub 1-V L-Band Low Noise Amplifier in SOI CMOS
Hiroshi KOMURASAKI Hisayasu SATO Kazuya YAMAMOTO Kimio UEDA Shigenobu MAEDA Yasuo YAMAGUCHI Nagisa SASAKI Takahiro MIKI Yasutaka HORIBA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/02/25
Vol. E83-A  No. 2  pp. 220-227
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
SOI CMOSlow noise amplifierL bandlow voltageRF
 Summary | Full Text:PDF(1.7MB)

Analyses on Monolithic InP HEMT Resistive Mixer Operating under Very Low LO Power
Takuo KASHIWA Kazuya YAMAMOTO Takayuki KATOH Takao ISHIDA Takahide ISHIKAWA Yasuo MITSUI Yoshikazu NAKAYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1999/10/25
Vol. E82-C  No. 10  pp. 1831-1838
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
resistive mixerLO powerconversion lossInP HEMTconductance
 Summary | Full Text:PDF(982.7KB)

A 1. 9 GHz Single-Chip RF Front-End GaAs MMIC with Low-Distortion Cascode FET Mixer
Masatoshi NAKAYAMA Kenichi HORIGUCHI Kazuya YAMAMOTO Yutaka YOSHII Shigeru SUGIYAMA Noriharu SUEMATSU Tadashi TAKAGI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1999/05/25
Vol. E82-C  No. 5  pp. 717-724
Type of Manuscript:  Special Section PAPER (Special Issue on Low Distortion Technology for Microwave Devices and Circuits)
Category: 
Keyword: 
GaAs MMICsingle-chip front-endmixercascode FETlow distortion
 Summary | Full Text:PDF(770.3KB)

A New Broadband Buffer Circuit Technique and Its Application to a 10-Gbit/s Decision Circuit Using Production-Level 0. 5 µm GaAs MESFETs
Miyo MIYASHITA Naoto ANDOH Kazuya YAMAMOTO Junichi NAKAGAWA Etsuji OMURA Masao AIGA Yoshikazu NAKAYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/10/25
Vol. E81-C  No. 10  pp. 1627-1638
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
GaAs MESFETbuffer circuitdecision circuitpeaking inductorsource-follower
 Summary | Full Text:PDF(964.4KB)

A 1. 9-GHz-Band Single-Chip GaAs T/R-MMIC Front-End Operating with a Single Voltage Supply of 2 V
Kazuya YAMAMOTO Takao MORIWAKI Yutaka YOSHI Kenichiro CHOMEI Takayuki FUJII Jun OTSUJI Yukio MIYAZAKI Kazuo NISHITANI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1998/07/25
Vol. E81-C  No. 7  pp. 1112-1121
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
GaAs MESFETMMIC front-endsingle-chipvoltage-doublernegative-voltage generator
 Summary | Full Text:PDF(1.1MB)

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 generatorGaAs MESFETpower amplifireMMIC front-end
 Summary | Full Text:PDF(1MB)

Optical Filter Utilizing the Directional Coupler Composed of the K-and Ag-ion Exchange Waveguides
Kiyoshi KISHIOKA Kazuya YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1996/10/25
Vol. E79-C  No. 10  pp. 1405-1412
Type of Manuscript:  Special Section PAPER (Special Issue on Electromagnetic Theory-Foundations and Applications)
Category: 
Keyword: 
optical filteroptical deviceoptical (integrated) circuition-exchange waveguidedirectional coupler
 Summary | Full Text:PDF(774.2KB)