Near field communication devices, systems, and methods using Q factor adjustments
AssigneeSamsung Electronics Co., Ltd.
InventorsJong-Pil Cho, Il-Jong Song
Life of this patent
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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.
Claims20
A Near Field Communication (NFC) device comprising:
- a resonance circuit configured to generate a first voltage in response to an electromagnetic wave;
- and
- an NFC chip configured to provide output data to the resonance circuit, to receive input data from the resonance circuit, to operate the resonance circuit with a first quality factor (Q factor) in response to a first mode signal, and to operate the resonance circuit with a second Q factor in response to a second mode signal,
- wherein the first mode signal is provided in a reader mode,
- the first mode signal is provided when a signal transmit operation is performed in a card mode,
- the second mode signal is provided when a signal receive operation is performed in the card mode, and
- the first Q factor is greater than the second Q factor.
An NFC device comprising:
- a resonance circuit configured to generate a first voltage in response to an electromagnetic wave;
- and
- an NFC chip configured to provide output data to the resonance circuit, to receive input data from the resonance circuit, to change a Q factor of the resonance circuit when a signal receive operation is performed in a card mode, to maintain the Q factor of the resonance circuit in a reader mode, and to maintain the Q factor of the resonance circuit when a signal transmit operation is performed in the card mode.
An NFC device comprising:
- a resonance circuit configured to generate a first voltage in response to an electromagnetic wave;
- and
- an NFC chip comprising:
- a central processing unit (CPU) configured to generate a mode signal that represents a card mode or a reader mode;
- and
- a transmit circuit configured to determine a Q factor of the resonance circuit based on the mode signal,
- wherein the mode signal represents a signal receive operation or a signal transmit operation when the mode signal represents the card mode, and
- wherein the NFC chip:
- changes the Q factor of the resonance circuit when the signal receive operation is performed in the card mode;
- maintains the Q factor of the resonance circuit in the reader mode;
- and
- maintains the Q factor of the resonance circuit when the signal transmit operation is performed in the card mode.
Dependencies are inferred from the claim text.