NEAR FIELD COMMUNICATION DEVICE
    2.
    发明申请

    公开(公告)号:US20180070220A1

    公开(公告)日:2018-03-08

    申请号:US15602860

    申请日:2017-05-23

    Abstract: Disclosed is a near field communication device which includes an antenna, a transceiver that transmits and receives a wireless signal through the antenna, a first detection pulse generation circuit that transmits a first detection pulse to the transceiver periodically in a first detection interval, a second detection pulse generation circuit that transmits a second detection pulse to the transceiver in a second detection interval, a start of frame (SOF) detection circuit that detects whether an SOF is received from the transceiver, in the second detection interval, and a control block that determines that a second near field communication device is present, when the SOF detection circuit detects the SOF.

    BI-DIRECTIONAL VOLTAGE CONVERTER OF SMART CARD AND SMART CARD INCLUDING THE SAME

    公开(公告)号:US20210406629A1

    公开(公告)日:2021-12-30

    申请号:US17227711

    申请日:2021-04-12

    Abstract: A bi-directional voltage converter of a smart card includes switching elements connected between an input node and an output node and a start-up transistors whose channel width over channel length is smaller than a channel width over channel length of the switching element. The bi-directional voltage converter stores a driving voltage applied to an output node in a storage capacitor during a booting operation and provides the voltage stored in the storage capacitor to an input node. The bi-directional voltage converter may boost another driving voltage at the input node step-wisely and may perform bi-directional voltage converting with reduced occupied area and high efficiency.

    NEAR FIELD COMMUNICATION DEVICE
    5.
    发明申请

    公开(公告)号:US20180138947A1

    公开(公告)日:2018-05-17

    申请号:US15626252

    申请日:2017-06-19

    CPC classification number: H04B5/0031 H03G3/3089 H04B5/0062 H04W4/80

    Abstract: A near field communication device includes an amplifier that amplifies a signal received through an antenna and outputs the signal as an amplified receive signal, a gain control block that adjusts a gain of the amplifier based on a level of a noise included in the amplified receive signal during a noise reception sequence, and a data determination block that determines a noise threshold voltage based on the level of the noise of the amplified receive signal after the gain is completely adjusted and determines data from the amplified receive signal by using the noise threshold voltage.

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