Shoji OTAKA


A 1024-QAM Capable WLAN Receiver with -56.3dB Image Rejection Ratio Using Self-Calibration Technique
Shusuke KAWAI Toshiyuki YAMAGISHI Yosuke HAGIWARA Shigehito SAIGUSA Ichiro SETO Shoji OTAKA Shuichi ITO 
Publication:   
Publication Date: 2018/07/01
Vol. E101-C  No. 7  pp. 457-463
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
Category: 
Keyword: 
WLAN1024-QAMcalibrationIQ mismatchimage rejection ratioEVM
 Summary | Full Text:PDF

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
 Summary | Full Text:PDF

A 380-MHz CMOS Linear-in-dB Variable Gain Amplifier with Gain Compensation Techniques for CDMA Systems
Osamu WATANABE Mitsuyuki ASHIDA Tetsuro ITAKURA Shoji OTAKA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/06/01
Vol. E86-C  No. 6  pp. 1069-1076
Type of Manuscript:  Special Section PAPER (Special Issue on Devices and Circuits for Next Generation Multi-Media Communication Systems)
Category: 
Keyword: 
variable gain amplifierVGAgain compensationtemperature compensationlinear-in-dB characteristicssquare circuitMOSFETsquare-law regionexponential-law regionCDMA
 Summary | Full Text:PDF

A 1-V 2-GHz CMOS Up-Converter Using Self-Switching Mixers
Toshiyuki UMEDA Shoji OTAKA Kenji KOJIMA Tetsuro ITAKURA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/02/01
Vol. E86-A  No. 2  pp. 262-267
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
Category: 
Keyword: 
low-power-supply voltagecurrent-mode mixercurrent addingself-switchDC offset canceller
 Summary | Full Text:PDF

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

Broadband and Flexible Receiver Architecture for Software Defined Radio Terminal Using Direct Conversion and Low-IF Principle
Hiroshi TSURUMI Hiroshi YOSHIDA Shoji OTAKA Hiroshi TANIMOTO Yasuo SUZUKI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/06/25
Vol. E83-B  No. 6  pp. 1246-1253
Type of Manuscript:  Special Section PAPER (Special Issue on Software Defined Radio and Its Technologies)
Category: 
Keyword: 
software defined radiodirect conversionlow-IFchannel selectionimage rejection
 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
 Summary | Full Text:PDF

Gate Current Control Method by Pull-Down FET's for 0-28 dB GaAs Variable Attenuator in Direct-Conversion Modulator IC for 1.9 GHz PHS
Tadahiro SASAKI Shoji OTAKA Tadahiko MAEDA Toshiyuki UMEDA Kazuya NISHIHORI Atsushi KAMEYAMA Mayumi HIROSE Yoshiaki KITAURA Naotaka UCHITOMI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1997/06/25
Vol. E80-C  No. 6  pp. 794-799
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeterwave High-power Devices)
Category: 
Keyword: 
GaAsdirect-conversionattenuatormodulatorMMICMESFETpersonal handy phone system
 Summary | Full Text:PDF

High-Speed CMOS I/O Buffer Circuits
Manabu ISHIBE Shoji OTAKA Junichi TAKEDA Shigeru TANAKA Yoshiaki TOYOSHIMA Satoru TAKATSUKA Shoichi SHIMIZU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1992/04/25
Vol. E75-C  No. 4  pp. 569-571
Type of Manuscript:  Special Section LETTER (Joint Special Issue on the 1991 VLSI Circuits Symposium)
Category: 
Keyword: 
 Summary | Full Text:PDF