Passive/active NFC transceiver

This 13.56 MHz NFC IP in generic low-cost 0.18 um CMOS
targets compatibility with ISO/IEC 14443 Type A at 106 to
424 kbit/s (compatible with NFC-equipped smartphone).
It covers a legacy passive mode, (battery-less) and an
active mode, (battery-assisted), for longer range or
poor antenna. In passive mode, the 1.5-2.0 V supply is
harvested from the magnetic field to supply < 150 uA
@106 kbit/s transceiver (plus MCU supporting protocol)
< 10 mA for other functionalities.
In active mode, the current consumption is 650 uA in
reception and 10.5 mA typ. for 260 ? antenna impedance
in transmission. Antenna impedance is adjusted for each
functionality with external serial capacitors for optimum
matching to the coil. The IP can be shrinked by removal
of either mode.