DEMODULATION CIRCUIT AND RFID SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a demodulation circuit surely extracting and discriminating a violation bit of a preamble part in an input signal.

SOLUTION: A demodulation circuit 20 according to an embodiment of the present invention comprises; a detection circuit 25 for generating a demodulation signal by detecting an input signal in the demodulation circuit used for an RFID system; and a first filter 22 which receives the demodulation signal from the detection circuit 25 and switches a cutoff frequency when receiving a preamble part of the demodulation signal and when receiving a data part of the demodulation signal.

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