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:
Oct. 15, 2019
Filed:
Jan. 10, 2018
Mediatek Singapore Pte. Ltd., Singapore, SG;
Chin-Heng Leow, Singapore, SG;
Tieng Ying Choke, Singapore, SG;
MEDIATEK Singapore Pte. Ltd., Singapore, SG;
Abstract
Circuits and methods for active load modulation is described. These circuits and methods may be employed in connection with near field communication (NFC) systems, for example in the proximity inductive coupling card (PICC). The methods described herein may be used to synchronize the operations of the system to the carrier clock provided by a reader with typical operation frequency of 13.56 MHz±7 KHz. The synchronization may be performed by locking an internal clock to the carrier clock when the transmission of data is disabled, by locking the internal clock to a local clock when data transmission is enabled, and by compensating the phase or frequency of the active load modulation clock to track the carrier clock.