Semiconductor Device
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Accused Products
Abstract
Of a wireless communication system, an RF tag which can operate normally even when a communication distance is extremely short, like the case where the RF tag is in contact with a reader/writer, whereby the reliability is improved. The RF tag which communicates data by wireless communication includes a comparison circuit which compares electric power supplied from outside with reference electric power and a protection circuit portion which is operated when the electric power supplied from outside is higher than the reference electric power in the comparison circuit.
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Citations
16 Claims
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1. (canceled)
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2. A semiconductor device comprising:
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a circuit electrically connected to a first node; a first transistor including a source, a drain, and a gate, wherein one of the source and the drain is directly connected to the first node, and wherein the gate is electrically connected to a second node; a resistor including a first terminal and a second terminal, wherein the first terminal is directly connected to the first node, and wherein the second terminal is electrically connected to the second node; and a first diode between the second node and a third node, wherein an impedance of the circuit is capable of being controlled in accordance with a potential of the other of the source and the drain. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. A semiconductor device comprising:
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a circuit electrically connected to a first node; a capacitor electrically connected to the circuit; a first transistor including a source, a drain, and a gate, wherein one of the source and the drain is directly connected to the first node, and wherein the gate is electrically connected to a second node; a resistor including a first terminal and a second terminal, wherein the first terminal is directly connected to the first node, and wherein the second terminal is electrically connected to the second node; and a first diode between the second node and a third node, wherein an impedance of the circuit is capable of being controlled in accordance with a potential of the other of the source and the drain. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification