NEAR FIELD COMMUNICATION DEVICE, ELECTRONIC SYSTEM HAVING THE SAME AND METHOD OF CONTROLLING POWER IN NEAR FIELD COMMUNICATION DEVICE
First Claim
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1. A near field communication (NFC) device, comprising:
- a resonance unit configured to emit an electromagnetic wave to communicate data with an external NFC card in a reader mode; and
an NFC chip configured to estimate a distance between the NFC device and the external NFC card based on an antenna voltage generated by the resonance unit while the resonance unit emits the electromagnetic wave, and configured to adjust a magnitude of the electromagnetic wave based on the estimated distance.
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Abstract
A near field communication (NFC) device includes a resonance unit and an NFC chip. The resonance unit emits an electromagnetic wave to communicate data with an external NFC card in a reader mode. The NFC chip estimates a distance between the resonance unit and the external NFC card based on an antenna voltage generated by the resonance unit while the resonance unit emits the electromagnetic wave, and adjusts a magnitude of the electromagnetic wave based on the estimated distance.
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Citations
27 Claims
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1. A near field communication (NFC) device, comprising:
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a resonance unit configured to emit an electromagnetic wave to communicate data with an external NFC card in a reader mode; and an NFC chip configured to estimate a distance between the NFC device and the external NFC card based on an antenna voltage generated by the resonance unit while the resonance unit emits the electromagnetic wave, and configured to adjust a magnitude of the electromagnetic wave based on the estimated distance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19)
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17. (canceled)
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18. (canceled)
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20. (canceled)
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21. (canceled)
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22. (canceled)
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23. An electronic system, comprising:
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a near field communication (NFC) device configured to communicate with an external device through NFC; a memory device configured to store output data and input data; and an application processor configured to control operations of the NFC device and the memory device, wherein the NFC device comprises; a resonance unit configured to emit an electromagnetic wave to transmit the output data to the external device and to receive the input data from the external device in a reader mode; and an NFC chip configured to estimate a distance between the resonance unit and the external device based on an antenna voltage generated by the resonance unit while the resonance unit emits the electromagnetic wave, and configured to adjust a magnitude of the electromagnetic wave based on the estimated distance. - View Dependent Claims (24, 25)
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26. (canceled)
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27. (canceled)
Specification