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:
Mar. 02, 2021
Filed:
Aug. 28, 2018
Applicant:
Stmicroelectronics (Rousset) Sas, Rousset, FR;
Inventor:
Nicolas Cordier, Aix-en-Provence, FR;
Assignee:
STMICROELECTRONICS (ROUSSET) SAS, Rousset, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04B 7/00 (2006.01); H04B 5/00 (2006.01); H01Q 7/00 (2006.01); H04B 5/02 (2006.01); G06K 7/10 (2006.01); H01Q 1/22 (2006.01); H01Q 9/04 (2006.01);
U.S. Cl.
CPC ...
H01Q 7/005 (2013.01); G06K 7/10237 (2013.01); H01Q 1/2225 (2013.01); H01Q 9/045 (2013.01); H01Q 9/0442 (2013.01); H04B 5/0075 (2013.01); H04B 5/02 (2013.01);
Abstract
A circuit for driving an antenna of near field communication (NFC) device, includes: a first variable resistor coupled to a first terminal of the antenna via a first capacitor; a second variable resistor coupled to a second terminal of the antenna via a second capacitor; and a control circuit configured to cause the first variable resistor and the second variable resistor to each have a selected one of a first resistance level, a second resistance level, and a third resistance level based on an operating phase of the circuit.