Samsung Electronics Co., Ltd.

Sung-Hye Choi

Il-Jong Song

Byeong-Taek Moon

Seong-sik Myoung

Tae-Ho Park

Bong-Su Jeon

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.

Modulation index setting circuits of near field communication (NFC) devices, NFC devices, and methods of operating NFC devices

Operating an NFC device to communicate with an NFC tag may include converting the NFC device between operating in a standby mode or an active mode, based on whether communication between the NFC device and an NFC tag is failed while the NFC device is operating in an active mode, detecting an NFC tag based on a tag detection sensitivity associated with the NFC device operating in the standby mode, converting the NFC device to operating in the active mode when an NFC tag is detected in the standby mode and adaptively controlling the tag detection sensitivity based on one or more user environment parameters associated with the NFC device. Power consumption and the tag detection sensitivity may be optimized based on adaptively controlling the tag detection sensitivity based on the one or more user environment parameters.

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Suwon-si, South Korea

Sung-Hye Choi