Why does some NFC antennas have two transmitters: TX1 and TX2?
nfc
Solution
Most NFC modules have two transmitter outputs pins. These are not two independent outputs but just the two pins of a single differential output.
The reason why a differential output is preferred by NFC modules is quite simple: It is often needed if the NFC chip only has a small supply voltage (3V is common). Since the output is capacitively coupled to the antenna, the antenna can be driven with twice the voltage compared to a single ended output.
That allows for twice the current, and hence twice the magnetic field in the antenna.
Problem
Why do some NFC-modules have two transmitters? TX1 and TX2? I really can't find what it's for... I was thinking about Single-end and differential signaling? So there would be less noise?