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US 2008/0164978 A1Published application
Semiconductor device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYoshifumi Tanada
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AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYoshifumi Tanada
Estimating the term…
It is an object of the present invention to provide a semiconductor device which can generate desired level of a power supply voltage even when the received power of carrier waves is reduced in the semiconductor device, such as RFID tags or the like, which receives and transmits data wirelessly and generates electric power inside using carrier waves. In a storage capacitor portion formed of a plurality of capacitor portions, the plurality of capacitor portions are charged in the state of parallel connection, and at the circuit operation, a high voltage can be taken out from part of or all of the plurality of capacitor portions in series connection corresponding to a power supply voltage in need at that time. Accordingly, when the received power of carrier waves is reduced, i.e. even when a distance between a tag and a reader/writer becomes large, a voltage that is necessary for the circuit operation inside the tag can be assured so as to greatly contribute to increase a communication distance. In addition, electric power can be favorably supplied to a circuit which requires a high driving voltage inside the tag.
A semiconductor device comprising:
A semiconductor device comprising:
A semiconductor device comprising:
A semiconductor device comprising:
A semiconductor device comprising:
Dependencies are inferred from the claim text.