Highly selective low-power card detector for near field communications (NFC)
First Claim
Patent Images
1. A device comprising:
- a processor;
a near field communication (NFC) antenna;
a card or tag detector coupled to the processor and the NFC antenna, wherein the card or tag detector further comprises;
at least one transistor component integrated with the NFC antenna to form an oscillator that resonates at a particular resonant frequency on a particular time period, wherein the at least one transistor component is configured to operate as a card detector component or as an NFC data communication component;
at least one switch component to switch operation of the at least one transistor component to detect a reflective impedance at the particular resonant frequency of the oscillator when operating as the card detector component, and to operate as the NFC data communication component upon detecting the reflective impedance that is substantially decreasing the oscillation of the oscillator.
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Abstract
Described herein are architectures, platforms and methods for implementing low-power detection of a near field communication (NFC) card or tags. In particular, an NFC antenna is integrated with at least one transistor to form an oscillator. A substantial decrease in oscillator'"'"'s oscillation indicates presence or detection of the NFC card or tag.
10 Citations
20 Claims
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1. A device comprising:
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a processor; a near field communication (NFC) antenna; a card or tag detector coupled to the processor and the NFC antenna, wherein the card or tag detector further comprises; at least one transistor component integrated with the NFC antenna to form an oscillator that resonates at a particular resonant frequency on a particular time period, wherein the at least one transistor component is configured to operate as a card detector component or as an NFC data communication component; at least one switch component to switch operation of the at least one transistor component to detect a reflective impedance at the particular resonant frequency of the oscillator when operating as the card detector component, and to operate as the NFC data communication component upon detecting the reflective impedance that is substantially decreasing the oscillation of the oscillator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A card or tag detector comprising:
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a near field communication (NFC) antenna; at least one transistor component integrated to the NFC antenna forming an oscillator that resonates at a particular frequency on a particular period, wherein the at least one transistor component is configured to operate as a card detector component or as an NFC data communication component; at least one switch component to switch operation of the at least one transistor to detect a reflective impedance at the particular frequency when operating as the card detector component, and to operate as the NFC data communication component upon detecting the reflective impedance that is substantially decreasing oscillation of the oscillator; an oscillation detector configured to detect presence of a coupling card or tag based on a substantially decreased oscillation of the oscillator. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A method of low-power near field communication (NFC) card or tag detection, the method comprising:
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integrating an NFC antenna with at least one transistor to form an oscillator that resonates at a particular frequency on a particular period, wherein the at least one transistor is configured to operate as a card detector component; setting an oscillator resonant frequency; detecting a reflective impedance for the oscillator resonant frequency, wherein the reflective impedance facilitates a substantial loss of oscillator oscillation; activating operation of an NFC data communication based upon the substantial loss of the oscillator oscillation, wherein the activating includes toggling operation of the at least one transistor from acting as the car detector component into an NFC data communication component. - View Dependent Claims (17, 18, 19, 20)
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Specification