The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 2021
Filed:
Oct. 16, 2019
Applicant:
Samsung Electronics Co., Ltd., Suwon-si, KR;
Inventors:
Assignee:
Samsung Electronics Co., Ltd., Suwon-si, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 5/02 (2006.01); H04B 5/00 (2006.01); H03L 7/081 (2006.01); H04W 4/80 (2018.01); H03K 5/135 (2006.01); H03K 5/00 (2006.01);
U.S. Cl.
CPC ...
H04B 5/02 (2013.01); H03K 5/135 (2013.01); H03L 7/0814 (2013.01); H04B 5/0031 (2013.01); H04W 4/80 (2018.02); H03K 2005/00058 (2013.01);
Abstract
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.