Near field communication devices, systems, and methods using Q factor adjustments
First Claim
Patent Images
1. An NFC (near field communication) device comprising:
- a resonance unit configured to generate a first voltage in response to an electromagnetic wave;
a rectifier configured to generate a second voltage by rectifying the first voltage;
a regulator configured to generate an internal voltage having a voltage level of a constant magnitude by using the second voltage to output the internal voltage to a first node; and
a Q (quality) sink unit connected between the first node and a ground voltage, the Q sink unit being turned on to reduce a Q factor (quality factor) of the resonance unit when a signal receive operation is performed in a card mode, and being turned off to maintain the Q factor in a reader mode and when a signal transmit operation is performed in the card mode.
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Abstract
An NFC (near field communication) device can include a resonance unit and an NFC chip. The resonance unit may communicate with an external device through an electromagnetic wave. The NFC chip can provide output data to the resonance unit, receive input data from the resonance unit, and can reduce a Q factor (quality factor) of the resonance unit when a signal receive operation is performed in a card mode, and can maintain the Q factor of the resonance unit in a reader mode and when a signal transmit operation is performed in the card mode.
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Citations
17 Claims
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1. An NFC (near field communication) device comprising:
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a resonance unit configured to generate a first voltage in response to an electromagnetic wave; a rectifier configured to generate a second voltage by rectifying the first voltage; a regulator configured to generate an internal voltage having a voltage level of a constant magnitude by using the second voltage to output the internal voltage to a first node; and a Q (quality) sink unit connected between the first node and a ground voltage, the Q sink unit being turned on to reduce a Q factor (quality factor) of the resonance unit when a signal receive operation is performed in a card mode, and being turned off to maintain the Q factor in a reader mode and when a signal transmit operation is performed in the card mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An NFC (near field communication) device comprising:
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a resonance circuit configured to generate a first voltage in response to an electromagnetic wave; a rectifier circuit configured to generate a second voltage by rectifying the first voltage; a regulator circuit configured to generate an internal voltage having a voltage level of a constant magnitude using the second voltage to output the internal voltage to a first node; and a Q (quality) sink circuit connected between the first node and a ground voltage, the Q sink circuit configured to reduce a Q factor of the resonance circuit when a signal receive operation is performed in a card mode of the NFC device, and configured to maintain the Q factor in a reader mode of the NFC device and when a signal transmit operation is performed in the card mode. - View Dependent Claims (15, 16, 17)
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Specification