Semiconductor Device
First Claim
1. A semiconductor device comprising:
- an antenna;
a first transistor, wherein a drain and a gate of the first transistor is electrically connected to one end of the antenna;
a first resistor, wherein one end of the first resistor is electrically connected to a source of the first transistor;
a second transistor, wherein one of a source and a drain of the second transistor is electrically connected to the one end of the first resistor, and a gate of the second transistor is electrically connected the other end of the first resistor;
a second resistor, wherein one end of the second resistor is electrically connected to the other of the source and the drain of the second transistor;
one or a plurality of third transistors, wherein a drain and a gate of any one of the one or the plurality of third transistors is electrically connected to the other end of the first resistor;
a fourth transistor, wherein a gate of the fourth transistor is electrically connected to the one end of the second resistor and the other of the source and the drain of the second transistor; and
a fifth transistor, wherein a gate of the fifth transistor is electrically connected to the gate of the fourth transistor, and one of a source and a drain of the fifth transistor is electrically connected to the drain and the gate of the first transistor,wherein the other end of the antenna, a source of the one or the plurality of third transistors, the other end of the second resistor, the other of the source and the drain of the fourth transistor, and the other of the source and the drain of the fifth transistor are grounded.
1 Assignment
0 Petitions
Accused Products
Abstract
An object is to provide a semiconductor device which operates stably even when the communication distance between a reader/writer and a non-contact data carrier is largely changed. A protection circuit is provided in the non-contact data carrier, and an operating state and a non-operating state of the protection circuit are switched depending on the communication distance between the reader/writer and the non-contact data carrier. The operating point at which the operating state and the non-operating state of the protection circuit are switched is different between the case where input voltage of the protection circuit is low in an initial state and then gradually raised and the case where input voltage of the protection circuit is high in an initial state and then gradually lowered.
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Citations
8 Claims
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1. A semiconductor device comprising:
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an antenna; a first transistor, wherein a drain and a gate of the first transistor is electrically connected to one end of the antenna; a first resistor, wherein one end of the first resistor is electrically connected to a source of the first transistor; a second transistor, wherein one of a source and a drain of the second transistor is electrically connected to the one end of the first resistor, and a gate of the second transistor is electrically connected the other end of the first resistor; a second resistor, wherein one end of the second resistor is electrically connected to the other of the source and the drain of the second transistor; one or a plurality of third transistors, wherein a drain and a gate of any one of the one or the plurality of third transistors is electrically connected to the other end of the first resistor; a fourth transistor, wherein a gate of the fourth transistor is electrically connected to the one end of the second resistor and the other of the source and the drain of the second transistor; and a fifth transistor, wherein a gate of the fifth transistor is electrically connected to the gate of the fourth transistor, and one of a source and a drain of the fifth transistor is electrically connected to the drain and the gate of the first transistor, wherein the other end of the antenna, a source of the one or the plurality of third transistors, the other end of the second resistor, the other of the source and the drain of the fourth transistor, and the other of the source and the drain of the fifth transistor are grounded. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A non-contact data carrier comprising:
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an antenna circuit comprising an antenna; a logic circuit; a demodulation circuit; a modulation circuit; a protection circuit; and a rectifier circuit, wherein a first operating point at which an operating state and a non-operating state of the protection circuit are switched in the case where the level of input voltage of the protection circuit is low in an initial state and then gradually raised is different from a second operating point at which an operating state and a non-operating state of the protection circuit in the case where the level of input voltage of the protection circuit is high in an initial state and then gradually lowered. - View Dependent Claims (8)
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Specification