Mamoru UGAJIN


Novel Access Control Scheme with Collision Detection Utilizing MIMO Transmission Procedure in WLAN Systems
Takefumi HIRAGURI Kentaro NISHIMORI Yoshiaki MORINO Mamoru UGAJIN Hideaki YOSHINO 
Publication:   
Publication Date: 2018/07/01
Vol. E101-B  No. 7  pp. 1561-1574
Type of Manuscript:  Special Section PAPER (Special Section on Communication Quality in Wireless Networks)
Category: 
Keyword: 
MIMOaccess controlWLANcollision detectionorthogonally polarized antenna
 Summary | Full Text:PDF(2.7MB)

An (N+N2)-Mixer Architecture for a High-Image-Rejection Wireless Receiver with an N-Phase Active Complex Filter
Mamoru UGAJIN Takuya SHINDO Tsuneo TSUKAHARA Takefumi HIRAGURI 
Publication:   
Publication Date: 2017/04/01
Vol. E100-A  No. 4  pp. 1008-1014
Type of Manuscript:  PAPER
Category: Circuit Theory
Keyword: 
integrated circuitwireless receiverimage rejectionmismatch correction3-phase analog circuitcomplex filter
 Summary | Full Text:PDF(1.6MB)

A 280-MHz CMOS Intra-Symbol Intermittent RF Front End for Adaptive Power Reduction of Wireless Receivers According to Received-Signal Intensity in Sensor Networks
Mitsuo NAKAMURA Mamoru UGAJIN Mitsuru HARADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2013/01/01
Vol. E96-C  No. 1  pp. 93-101
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
intra-symbol intermittentRF front endlow powerwireless receiverRF CMOSsensor network
 Summary | Full Text:PDF(2.7MB)

Third-Harmonic Envelope Feedback Method for High-Efficiency Linear Power Amplifiers
Shoichi OSHIMA Mamoru UGAJIN Mitsuru HARADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/04/01
Vol. E95-C  No. 4  pp. 713-716
Type of Manuscript:  BRIEF PAPER
Category: 
Keyword: 
power amplifierdistortionlinearizerharmonicsfeedback
 Summary | Full Text:PDF(685KB)

Operation of Ultra-Low Leakage Regulator Circuits with SOI and Bulk Technologies for Controlling Wireless Transceivers
Mamoru UGAJIN Akihiro YAMAGISHI Kenji SUZUKI Mitsuru HARADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/10/01
Vol. E94-C  No. 10  pp. 1702-1705
Type of Manuscript:  BRIEF PAPER
Category: Electronic Circuits
Keyword: 
power managementpower-switchenergy harvestingCMOS
 Summary | Full Text:PDF(463.8KB)

Design and Performance of a Sub-Nano-Ampere Two-Stage Power Management Circuit in 0.35-µm CMOS for Dust-Size Sensor Nodes
Mamoru UGAJIN Toshishige SHIMAMURA Shin'ichiro MUTOH Mitsuru HARADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/07/01
Vol. E94-C  No. 7  pp. 1206-1211
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
sensor nodepower managementpower switchenergy harvestingCMOS
 Summary | Full Text:PDF(1.3MB)

A 1-Mbps 1.6-µA Active-RFID CMOS LSI for the 300-MHz Frequency Band with an All-Digital RF Transmitting Scheme
Kenji SUZUKI Mamoru UGAJIN Mitsuru HARADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Vol. E94-C  No. 6  pp. 1084-1090
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
active tagsRFIDVHFlow powertransmitterOOKwireless sensor networks
 Summary | Full Text:PDF(1.8MB)

A 5th-Order SC Complex BPF Using Series Capacitances for Low-IF Narrowband Wireless Receivers
Kenji SUZUKI Mamoru UGAJIN Mitsuru HARADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/05/01
Vol. E94-C  No. 5  pp. 890-895
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
complex filtersBPFswitched-capacitor circuitslow-IFCMOSlow-power
 Summary | Full Text:PDF(1.6MB)

A 2.4-GHz PLL Synthesizer for a 1-V Bluetooth RF Transceiver
Akihiro YAMAGISHI Mamoru UGAJIN Tsuneo TSUKAHARA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/06/01
Vol. E87-C  No. 6  pp. 895-900
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: 
Keyword: 
PLLsynthesizerlow-powerphase noiseBluetooth
 Summary | Full Text:PDF(741.7KB)

A 1-V 2.4-GHz Downconverter for FSK Wireless Applications with a Complex BPF and a Frequency Doubler in CMOS/SOI
Mamoru UGAJIN Junichi KODATE Tsuneo TSUKAHARA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2004/06/01
Vol. E87-C  No. 6  pp. 888-894
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit and Device Technologies)
Category: 
Keyword: 
RFFSK downconverterCMOSSOIcomplex BPFfrequency doubler
 Summary | Full Text:PDF(916.8KB)

Gain Improvement of a 2.4-GHz/5-GHz CMOS Low Noise Amplifier by Using High-Resistivity Silicon-on-Insulator Wafers
Junichi KODATE Mamoru UGAJIN Tsuneo TSUKAHARA Takakuni DOUSEKI Nobuhiko SATO Takehito OKABE Kazuaki OHMI Takao YONEHARA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/06/01
Vol. E86-C  No. 6  pp. 1041-1049
Type of Manuscript:  Special Section PAPER (Special Issue on Devices and Circuits for Next Generation Multi-Media Communication Systems)
Category: 
Keyword: 
RFICCMOSLNAsilicon-on-insulatorSOI
 Summary | Full Text:PDF(899.9KB)

A 0.6-V Supply, Voltage-Reference Circuit Based on Threshold-Voltage-Summation Architecture in Fully-Depleted CMOS/SOI
Mamoru UGAJIN Kenji SUZUKI Tsuneo TSUKAHARA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/08/01
Vol. E85-C  No. 8  pp. 1588-1595
Type of Manuscript:  Special Section PAPER (Special Issue on High-Performance Analog Integrated Circuits)
Category: 
Keyword: 
voltage referenceCMOSlow voltageSOI
 Summary | Full Text:PDF(819.1KB)

A 1-V 2-GHz RF Receiver with 49 dB of Image Rejection in CMOS/SIMOX
Mamoru UGAJIN Junichi KODATE Tsuneo TSUKAHARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/02/01
Vol. E85-A  No. 2  pp. 293-299
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
image rejectionCMOSlow voltageSOIRF
 Summary | Full Text:PDF(873.4KB)

Emitter-Resistance Effect on Cutoff Frequency of Widegap-Emitter Si HBTs
Mamoru UGAJIN Yoshihito AMEMIYA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1991/06/25
Vol. E74-C  No. 6  pp. 1609-1614
Type of Manuscript:  Special Section PAPER (Special Issue on Device and Process Simulation for Ultra Large Scale Integration)
Category: 
Keyword: 
 Summary | Full Text:PDF(440.5KB)