Modulation index setting circuits of near field communication (NFC) devices, NFC devices, and methods of operating NFC devices
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United States of America Patent
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Jul 23, 2019
Grant Date -
Jun 20, 2019
app pub date -
Sep 13, 2018
filing date -
Dec 14, 2017
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Abstract
A modulation index setting circuit of a near field communication (NFC) device, includes a current detector. The current detector generates a reference current based on detecting a transmitter current flowing in a transmitter of the NFC device respectively during a non-modulation interval, and generates a modulation current based on detecting the transmitter current flowing in the transmitter of the NFC device during a modulation interval. The modulation index setting circuit changes the transmitter current based on applying a driving strength control code to the transmitter, receives the reference current and the modulation current, calculates modulation indexes associated with separate, respective code values of the driving strength control code and generates a modulation index table that stores the modulation indexes.
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