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:
Aug. 18, 2020
Filed:
Sep. 13, 2019
Synchronization between an object and a reader contactlessly communicating by active load modulation
Stmicroelectronics SA, Montrouge, FR;
Marc Houdebine, Crolles, FR;
STMicroelectronics S.A., Montrouge, FR;
Abstract
A method of contactless communication can be performed between an object and a reader using active load modulation. A synchronization process is performed between a first carrier signal transmitted by the reader and having a reference frequency, and a second carrier signal extracted from an output signal of a controlled oscillator of a digital phase-locked loop of the object. In the synchronization process, as long as a locking of the loop has not been detected, the frequency of the output signal of the oscillator is latched on a frequency that is a multiple of the reference frequency. Once the locking has been detected, the latching continues while controlling the oscillator with a second control signal generated from a second value obtained.