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US 2014/0194055 A1Published application
Near Field Communication Apparatus
AssigneeCambridge Silicon Radio Limited
InventorSteve Jones
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AssigneeCambridge Silicon Radio Limited
InventorSteve Jones
Estimating the term…
A system for use in a near field communications (NFC) reader, for detecting the presence of an NFC tag, is disclosed. The NFC reader has an antenna tuned to a resonant frequency. The system comprises: a first signal generator for generating a carrier signal whose frequency varies about the resonant frequency; a second signal generator for generating a modulating signal for modulating the carrier signal; a modulator for modulating the carrier signal with the modulating signal; a driver for driving the antenna with the modulated signal; and a detection system for detecting harmonics of the modulating signal in a signal present in the antenna as a result of the modulated signal. The detector is configured to generate an output when a third or higher order harmonic is detected.
A system for use in a near field communications (NFC) reader for detecting the presence of an NFC tag, the NFC reader having an antenna tuned to a resonant frequency, the system comprising:
A method for use in a near field communications (NFC) reader for detecting the presence of an NFC tag, the NFC reader having an antenna tuned to a resonant frequency, the method comprising:
Dependencies are inferred from the claim text.