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    Synchronization method of an active load modulation clock within a transponder
    21.
    发明授权
    Synchronization method of an active load modulation clock within a transponder 有权

    公开(公告)号：US10122557B1

    公开(公告)日：2018-11-06

    申请号：US15966948

    申请日：2018-04-30

    Applicant: STMicroelectronics razvoj polprevodnikov d.o.o.

    Inventor： Maksimiljan Stiglic ,  Kosta Kovacic

    IPC: H03C5/00 ,  H04L27/20 ,  H04L27/36 ,  H04L27/04

    CPC classification number: H04L27/2071 ,  G06K19/0723 ,  H04B5/0056 ,  H04L27/04 ,  H04L27/361

    Abstract: A method of wireless communication includes transmitting frames from a transponder to a reader and synchronizing between a reader carrier frequency and an active load modulation (ALM) carrier frequency within each transmitted frame. Each transmitted frame includes ALM carrier bursts generated from subcarrier modulation by binary phase shift keying (BPSK) data encoding and producing signal oscillations at a transponder antenna after each ALM carrier burst generation, The synchronizing occurs at each phase change of the data encoding when no burst is generated during a half period of the subcarrier preceding the phase change and a half period of the subcarrier following this phase change. The transponder antenna has a moderate quality factor sufficient to naturally damp the signal oscillations so that the synchronizing is performed without performing any controlled signal oscillations damping.

    ACTIVE DAMPING AND POWER CONTROL IN NFC ACTIVE LOAD MODULATION
    24.
    发明公开
    ACTIVE DAMPING AND POWER CONTROL IN NFC ACTIVE LOAD MODULATION 审中-公开

    公开(公告)号：US20230344468A1

    公开(公告)日：2023-10-26

    申请号：US18298914

    申请日：2023-04-11

    Applicant: STMicroelectronics Razvoj Polprevodnikov D.O.O.

    Inventor： Ziga Korosak

    IPC: H04B5/00 ,  H03L7/08

    CPC classification number: H04B5/0068 ,  H03L7/08

    Abstract: A method for managing a signal transmission emitted by a wireless transponder to a reader is provided in which the signal transmission uses an active load modulation and includes transmitted bursts separated by pause periods. Each transmitted burst includes transmitted pulses. The method includes performing an active damping operation at the end of the transmitted bursts in the beginning of the pause periods, and the active damping operation includes transmitting a number of additional pulses having a phase opposite to the phase of the transmitted pulses. The transmitted pulses power, the additional pulses power, and the number of additional pulses are controlled based on a distance between the reader and the wireless transponder and on reference values of the transmitted pulses power, the additional pulses power, and the number respectively associated with reference distances.

    Method for limiting the level of a modulated signal received by a tag and corresponding limiter
    28.
    发明授权
    Method for limiting the level of a modulated signal received by a tag and corresponding limiter 有权

    公开(公告)号：US10984301B2

    公开(公告)日：2021-04-20

    申请号：US16442811

    申请日：2019-06-17

    Applicant: STMicroelectronics razvoj polprevodnikov d.o.o.

    Inventor： Maksimiljan Stiglic ,  Iztok Bratuz ,  Albin Pevec ,  Roman Benkovic

    IPC: G06K19/07 ,  H02H9/04 ,  H04L27/06

    Abstract: An integrated circuit, includes: an input configured to receive an induced signal that is modulated according to a protocol belonging to the group including protocols using ASK modulation and protocols using OOK modulation; a detection circuit configured to detect the modulation of the induced signal; a decoding circuit configured to detect the protocol; a configurable limiter configured to limit a level of the induced signal and having a first configuration adapted to protocols using ASK modulation and a second configuration adapted to protocols using OOK modulation; and a control circuit configured to set the limiter in the first configuration until a protocol is detected, and to switch the limiter from the first configuration to the second configuration in response to a protocol using OOK modulation being detected.

    Method for Limiting the Level of a Modulated Signal Received by a Tag and Corresponding Limiter
    30.
    发明申请
    Method for Limiting the Level of a Modulated Signal Received by a Tag and Corresponding Limiter 审中-公开

    公开(公告)号：US20190385036A1

    公开(公告)日：2019-12-19

    申请号：US16442811

    申请日：2019-06-17

    Applicant: STMicroelectronics razvoj polprevodnikov d.o.o.

    Inventor： Maksimiljan Stiglic ,  Iztok Bratuz ,  Albin Pevec ,  Roman Benkovic

    IPC: G06K19/07 ,  H04L27/06 ,  H02H9/04

    Abstract: An integrated circuit, includes: an input configured to receive an induced signal that is modulated according to a protocol belonging to the group including protocols using ASK modulation and protocols using OOK modulation; a detection circuit configured to detect the modulation of the induced signal; a decoding circuit configured to detect the protocol; a configurable limiter configured to limit a level of the induced signal and having a first configuration adapted to protocols using ASK modulation and a second configuration adapted to protocols using OOK modulation; and a control circuit configured to set the limiter in the first configuration until a protocol is detected, and to switch the limiter from the first configuration to the second configuration in response to a protocol using OOK modulation being detected.

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