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:
Jan. 07, 2014
Filed:
Sep. 25, 2012
Cambridge Silicon Radio Limited, Cambridge, GB;
Anthony McFarthing, Cambridgeshire, GB;
Shyam Patel, Cambridge, GB;
Cambridge Silicon Radio Limited, Cambridge, GB;
Abstract
The present application relates to a near field communications (NFC) device having an antenna which is coupled to a load. When in the presence of an active NFC reader or similar device, the antenna generates an electromotive force (EMF), which serves as an input signal to the load. A variable potential divider is included to vary the voltage of the input signal to the load, so that if a potentially damaging over-voltage condition exists the voltage of the input signal to the load can be reduced to a safe level. The variable potential divider may be composed of an effective source impedance and an effective impedance of the load, and the impedance of the impedance matching network may be variable by means of a variable capacitance and/or a variable resistance.