T
Toshiyuki Umeda
Researcher at Toshiba
Publications - 79
Citations - 1008
Toshiyuki Umeda is an academic researcher from Toshiba. The author has contributed to research in topics: Signal & Transistor. The author has an hindex of 13, co-authored 79 publications receiving 986 citations. Previous affiliations of Toshiyuki Umeda include Tokyo Institute of Technology.
Papers
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Journal ArticleDOI
A 950-MHz rectifier circuit for sensor network tags with 10-m distance
TL;DR: In this article, the authors presented a 950-MHz wireless power transmission system and a high-sensitivity rectifier circuit for ubiquitous sensor network tags, which offers a battery-life-free sensor tag by recharging the output power of a base station into a secondary battery implemented with the tag.
Proceedings ArticleDOI
A 950 MHz rectifier circuit for sensor networks with 10 m-distance
TL;DR: In this paper, a high-sensitivity rectifier was fabricated in a 0.3 /spl mu/m CMOS technology, which can rectify an RF signal less than the NMOS threshold voltage by using a bias voltage between the gate and the drain terminals of a transistor.
Patent
Rectifier circuit and radio communication device
Toshiyuki Umeda,Shoji Ootaka +1 more
TL;DR: In this paper, a rectifier circuit includes a bias circuit that outputs a direct-current voltage; a first MOS transistor that has a gate and a source; and a second MOS transistors that have a gate, a source, and a drain connected to the source.
Patent
Battery information acquiring apparatus
Hiroki Sakurai,Tetsuro Itakura,Toshiyuki Umeda,Akiko Yamada,Nobuo Shibuya,Yoshinao Tatebayashi,Daisuke Kurose +6 more
TL;DR: In this article, an apparatus consisting of a voltage acquiring unit which acquires an interterminal voltage of the battery cell, a battery information acquiring circuit which receives the battery information of a battery cell with the acquired voltage being supplied as a power supply voltage and a transformer configured to have a primary winding and a secondary winding, the primary winding being connected to a common wire.
Patent
Method of setting wireless link, wireless communication device and wireless system
Katsumi Yamato,Takafumi Sakamoto,Toshiyuki Umeda,Shoji Otaka,Keisuke Mera,Hiroshi Nishimura,Hiroo Makari +6 more
TL;DR: In this paper, a method of setting a wireless link between a first wireless device and a second wireless device in a wireless system is provided, where the first wireless devices includes an extremely low-power receiver.