APPARATUS AND METHOD FOR DETECTING RFID SIGNALS

摘要

A mixed-mode signal detection apparatus suitable for ISO/IEC 14443 Type A and Type B RFID proximity card applications. The apparatus combines switched capacitor sampling and digital post processing to recover information from Amplitude Shift Keying (ASK) modulated signals. A phase detector triggers a pulse generator, which is used to signal sample and hold units that store the peak value of each carrier signal cycle. The samples are used to form a discrete version of the modulation signal and are post-processed digitally to recover encoded signal information.