Semiconductor device and driving method thereof

Details Semiconductor device and driving method thereof Semiconductor device and driving method thereof

2004-12-03

2008-12-30

Bugg, George A (Department: 2612)

Communications: electrical

Selective

Interrogation response

C340S572100, C340S539100, C340S572400, C340S572700

Reexamination Certificate

active

07471188

ABSTRACT:
There has been a problem in battryless RFID chips that a high voltage AC signal is generated when an antenna is exposed to a high electromagnetic field, and a DC voltage that is obtained through rectification of the AC signal becomes a high voltage accordingly. As a result, heat generation of a logic circuit and a clock generator circuit or element break down occur. The invention takes the following measures: a DC voltage generated through rectification of an AC signal is compared with a reference voltage in a comparator circuit, and a switch element is turned ON when the DC voltage becomes higher so as to add capacitance to an antenna circuit. Accordingly, resonance point of an antenna changes which in turn attenuates an AC signal generated in the antenna circuit, thereby suppressing a DC voltage.

REFERENCES:
patent: 6229443 (2001-05-01), Roesner
patent: 6321067 (2001-11-01), Suga et al.
patent: 6427065 (2002-07-01), Suga et al.
patent: 7158031 (2007-01-01), Tuttle
patent: 2003/0016133 (2003-01-01), Egbert
patent: 2000-299440 (2000-10-01), None

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