RE: How NFC signal is modulated?

Dat_Boy — Tue, 29 Jan 2019 13:15:22 GMT

thanks)

RE: How NFC signal is modulated?

haakonsh — Tue, 29 Jan 2019 13:12:54 GMT

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.

RE: How NFC signal is modulated?

Dat_Boy — Tue, 29 Jan 2019 07:01:54 GMT

If i'm right, amplitude modulation is used.