Determining initial transmission phase offset in an NFC device

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United States of America Patent

PATENT NO 12119892
APP PUB NO 20220407565A1
SERIAL NO

17752371

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Abstract

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There is described a method of determining an initial transmission phase offset in an NFC device configured to operate in NFC card mode only, wherein the NFC device comprises an NFC chip and a matching circuit. The method comprises: determining an initial RF matching resonance frequency of the NFC device utilizing an internal oscillator of the NFC chip; reading correction data from a non-volatile memory of the NFC chip, the correction data being indicative of a frequency offset of the internal oscillator relative to a nominal oscillator frequency; determining a corrected RF matching resonance frequency of the NFC device based on the initial RF matching resonance frequency and the correction data; and determining the initial transmission phase offset based on the corrected RF matching resonance frequency. Furthermore, a device and a method of manufacturing an NFC device are described.

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Patent Owner(s)

Patent OwnerAddress
NXP B VHIGHTECH CAMPUS 60 EINDHOVEN 5656AG

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Wobak, Markus Graz, AT 21 235

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