ask rfid

Hello, I am trying to understand how the ASK 125KHz RFID reader on page 140 of this pdf works (4.0 ASK READER SCHEMATIC, Page 134 of the document): https://ww1.microchip.com/downloads/en/devicedoc/51115f.pdf My understanding is that RFID data is modulated on a 125KHz carrier signal and the...