RADIO-FREQUENCY COMMUNICATION DEVICE HAVING A NEAR FIELD COMMUNICATION FUNCTION, AND METHOD OF OPERATING THE SAME
First Claim
1. A radio-frequency (RF) communication device having a near field communication (NFC) function, the RF communication device comprising:
- a first detection mode circuit configured to output an RF input signal received by an antenna as a first RF signal while the first detection mode circuit is enabled, wherein the first detection mode circuit is enabled during a first time period; and
a second detection mode circuit configured to amplify the RF input signal and output the amplified RF input signal as a second RF signal while the second detection mode circuit is enabled, wherein the second detection mode circuit is enabled during a second time period, and the second time period is shorter than the first time period,wherein the first and second detection mode circuits are enabled alternately and repeatedly.
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Accused Products
Abstract
A radio-frequency (RF) communication device having a near field communication (NFC) function includes a first detection mode circuit configured to output an RF input signal received by an antenna as a first RF signal while the first detection mode circuit is enabled, and a second detection mode circuit configured to amplify the RF input signal and output the amplified RF input signal as a second RF signal while the second detection mode circuit is enabled. The first detection mode circuit is enabled during a first time period, and the second detection mode circuit is enabled during a second time period. The second time period is shorter than the first time period. The first and second detection mode circuits are enabled alternately and repeatedly.
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Citations
20 Claims
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1. A radio-frequency (RF) communication device having a near field communication (NFC) function, the RF communication device comprising:
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a first detection mode circuit configured to output an RF input signal received by an antenna as a first RF signal while the first detection mode circuit is enabled, wherein the first detection mode circuit is enabled during a first time period; and a second detection mode circuit configured to amplify the RF input signal and output the amplified RF input signal as a second RF signal while the second detection mode circuit is enabled, wherein the second detection mode circuit is enabled during a second time period, and the second time period is shorter than the first time period, wherein the first and second detection mode circuits are enabled alternately and repeatedly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio-frequency (RF) communication device, comprising:
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a passive mode circuit configured to receive an RF signal from an external near field communication (NFC) reader, and output the received RF signal as a first RF signal while the passive mode circuit is enabled, wherein the passive mode circuit is enabled during a first time period; an amplified mode circuit configured to receive the RF signal from the external NFC reader, amplify the RF signal, and output the amplified RF signal as a second RF signal while the amplified mode circuit is enabled, wherein the amplified mode circuit is enabled during a second time period, and the second time period is shorter than the first time period; and an RF detecting circuit configured to receive the first RF signal or the second RF signal, detect a voltage level, a voltage variation or a clock signal of the first RF signal or the second RF signal, and output a detection signal indicating whether the RF signal has been detected based on the detected voltage level, the detected voltage variation or the detected clock signal, wherein the passive mode circuit and the amplified mode circuit are alternately activated. - View Dependent Claims (14, 15)
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16. A method of operating a radio-frequency (RF) communication device, comprising:
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outputting, by a first detection mode circuit, an RF input signal received by an antenna as a first RF signal while the first detection mode circuit is enabled, wherein the first detection mode circuit is enabled during a first time period; amplifying, by a second detection mode circuit, the RF input signal while the second detection mode circuit is enabled; outputting, by the second detection mode circuit, the amplified RF input signal as a second RF signal while the second detection mode circuit is enabled, wherein the second detection mode circuit is enabled during a second time period, and the second time period is shorter than the first time period, wherein the first and second detection mode circuits are enabled alternately and repeatedly. - View Dependent Claims (17, 18, 19, 20)
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Specification