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How NFC signal is modulated?

Hi, if somebody know what is the type of modulation using in NFC module of nRF52832?

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  • From PS; 42 NFCT — Near field communication tag:

    The NFCT peripheral (referred to as the 'NFC peripheral' from now on) supports communication signal
    interface type A and 106 kbps bit rate from the NFC Forum.
    With appropriate software, the NFC peripheral can be used to emulate the listening device NFC-A as
    specified by the NFC Forum.
    Listed here are the main features for the NFC peripheral:
    • NFC-A listen mode operation
    • 13.56 MHz input frequency
    • Bit rate 106 kbps
    • Wake-on-field low power field detection (SENSE) mode
    • Frame assemble and disassemble for the NFC-A frames specified by the NFC Forum
    • Programmable frame timing controller
    • Integrated automatic collision resolution, CRC and parity functions


    From http://www.rfwireless-world.com/Terminology/NFC-A-vs-NFC-B-vs-NFC-F.html


    The signalling type NFC-A is based on ISO/IEC 14443A. It is similar to RFID type A. In the type-A based communication delay encoding (miller encoding) technique is employed along with AM modulation. Here binary data is transmitted with the data rate of about 106 Kbps using type A communication. Here binary signal must change from 0 % to 100 % to distinguish between binary 1 and binary 0 data informations.

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  • From PS; 42 NFCT — Near field communication tag:

    The NFCT peripheral (referred to as the 'NFC peripheral' from now on) supports communication signal
    interface type A and 106 kbps bit rate from the NFC Forum.
    With appropriate software, the NFC peripheral can be used to emulate the listening device NFC-A as
    specified by the NFC Forum.
    Listed here are the main features for the NFC peripheral:
    • NFC-A listen mode operation
    • 13.56 MHz input frequency
    • Bit rate 106 kbps
    • Wake-on-field low power field detection (SENSE) mode
    • Frame assemble and disassemble for the NFC-A frames specified by the NFC Forum
    • Programmable frame timing controller
    • Integrated automatic collision resolution, CRC and parity functions


    From http://www.rfwireless-world.com/Terminology/NFC-A-vs-NFC-B-vs-NFC-F.html


    The signalling type NFC-A is based on ISO/IEC 14443A. It is similar to RFID type A. In the type-A based communication delay encoding (miller encoding) technique is employed along with AM modulation. Here binary data is transmitted with the data rate of about 106 Kbps using type A communication. Here binary signal must change from 0 % to 100 % to distinguish between binary 1 and binary 0 data informations.

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