Circuit and method for activating an NFC device
First Claim
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1. A near-field communication (NFC) router, comprising:
- a first terminal;
a second terminal;
a first switch coupled between the first terminal of the NFC router and the second terminal of the NFC router;
a rectifier bridge having input terminals coupled to terminals of an antenna external to the NFC router, the rectifier bridge being configured to rectify a signal detected by the antenna external to the NFC router;
a resistive and capacitive cell comprising a resistive element having a first terminal and a second terminal, the first terminal of the resistive element being coupled to form a node with an output terminal of the rectifier bridge, the second terminal of the resistive element being coupled to form a node with a control terminal of the first switch; and
a third terminal configured to be coupled to a voltage source through a second switch that is external to the NFC router, wherein the first switch comprises a first transistor of a first conductivity type, wherein the second switch comprises a second transistor of a second conductivity type different from the first conductivity type.
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Abstract
An embodiment near-field communication (NFC) router, includes a first switch coupled between a first terminal of the NFC router and a second terminal of the NFC router; and a rectifier bridge having an output terminal coupled to a control terminal of the first switch, the rectifier bridge being configured to rectify a signal detected by an antenna external to the NFC router.
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Citations
18 Claims
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1. A near-field communication (NFC) router, comprising:
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a first terminal; a second terminal; a first switch coupled between the first terminal of the NFC router and the second terminal of the NFC router; a rectifier bridge having input terminals coupled to terminals of an antenna external to the NFC router, the rectifier bridge being configured to rectify a signal detected by the antenna external to the NFC router; a resistive and capacitive cell comprising a resistive element having a first terminal and a second terminal, the first terminal of the resistive element being coupled to form a node with an output terminal of the rectifier bridge, the second terminal of the resistive element being coupled to form a node with a control terminal of the first switch; and a third terminal configured to be coupled to a voltage source through a second switch that is external to the NFC router, wherein the first switch comprises a first transistor of a first conductivity type, wherein the second switch comprises a second transistor of a second conductivity type different from the first conductivity type. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system, comprising:
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a near-field communication (NFC) router, comprising; a first terminal configured to be coupled to a voltage supplied by a battery; a second terminal configured to be coupled to a ground potential; a third terminal configured to be coupled to the voltage supplied by the battery; a rectifying circuit configured to rectify a signal detected by an antenna; a first switch coupled between the first terminal and the second terminal; and a first resistive element having a first terminal and a second terminal the first terminal of the first resistive element being coupled to form a node with an output terminal of the rectifying circuit, the second terminal of the first resistive element being coupled to form a node with a control terminal of the first switch; and a second switch external to the NFC router and coupled between the voltage supplied by the battery and the third terminal of the NFC router, wherein a control terminal of the second switch is connected to the first terminal of the NFC router. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for activating a contactless communication router, the method comprising:
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decoupling a first terminal of the contactless communication router from a second terminal of the contactless communication router in response to no signal being detected by an antenna, the first terminal of the contactless communication router being controllably coupled to a ground potential, the second terminal of the contactless communication router being tied to the ground potential; decoupling a third terminal of the contactless communication router from a power supply voltage in response to no signal being detected by the antenna, the third terminal being configured to supply the power supply voltage to communication circuitry of the contactless communication router; coupling the first terminal of the contactless communication router to the ground potential in response to a signal being detected by the antenna; and coupling the third terminal of the contactless communication router to the power supply voltage in response to the coupling of the first terminal of the contactless communication router to the ground potential, wherein the contactless communication router comprises a rectifier bridge, a resistive element, and a first switch, the first switch being coupled between the first terminal and the second terminal of the contactless communication router, the rectifier bridge being coupled between the antenna and a first terminal of a resistive element, the second terminal of the resistive element being coupled to form a node with a control terminal of the first switch. - View Dependent Claims (16, 17, 18)
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Specification