Volentine, Whitt & Francos, PLLC
Near-field communication circuit and operation method of the same
A near-field communication (NFC) circuit includes a transmitter that generates a transmission signal based on a reference clock signal and transmits the transmission signal through an antenna; a clock recovery circuit that receives a detection signal through the antenna responsive to the transmission signal and recovers a recovered clock signal from the detection signal; a phase detector that detects a phase change of the recovered clock signal; and a controller that determines, based on the phase change of the recovered clock signal, whether an NFC tag external to the NFC circuit is located within a communication range of the NFC circuit.
Samsung Electronics Co., Ltd.
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Jun-Ho Young-Joo Byeong-Taek
Kim Lee Moon