Toshiyuki UMEDA

950 MHz, -60 dB TX-Cancellation Active Directional Couplers for UHF RFID Application
Fumi MORITSUKA Hidenori OKUNI Toshiyuki UMEDA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/10/01
Vol. E94-C  No. 10  pp. 1539-1547
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Active Devices and Circuits
Keyword: 
RFID, TX cancellation, directional coupler, 
 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 voltage, current-mode mixer, current adding, self-switch, DC offset canceller, 
 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: 
GaAs, direct-conversion, attenuator, modulator, MMIC, MESFET, personal handy phone system, 
 Summary | Full Text:PDF