| 摘要 |
Provided is a demodulation circuit, including: first and second signal detectors which receive an amplitude modulation signal respectively through first and second input terminals and have different envelope reproduction speeds from each other; a first differential amplifier receiving output signals of the first and second signal detectors through first and second input nodes; a second differential amplifier receiving first and second output signals of the first differential amplifier through first and second nodes; and logic means for converting an output signal of the second differential amplifier into a logic signal. Thus, the demodulation circuit can operate at a low voltage and thus is suitable for a low power system and is also simplified in structure, and thus it can be employed in the tag circuit of the UHF-band passive type RFID system
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