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. 08, 2019
Filed:
Feb. 15, 2019
Nxp B.v., Eindhoven, NL;
Jens Fleischhacker, Hamburg, DE;
Hermanus Johannes Effing, Overasselt, NL;
NXP B.V., Eindhoven, NL;
Abstract
A low frequency (LF) antenna control circuit is disclosed. The LF antenna control circuit includes an antenna driver to drive an antenna, a current and phase measurement circuit to measure antenna current and signal phase, a modulator to modulate a signal to be transmitted via the antenna and a controller configured to drive the antenna through the antenna driver using a first fixed amplitude for a first time period, a second fixed amplitude for a second time period that is subsequent to the first time period and subsequent to the second time period, and subsequently, to drive the antenna using step up/down voltages based on the measured antenna current and signal phase. The signal included encoded bits of data to be transmitted.