AM (amplitude modulation) demodulation system for RFID reader device
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United States of America Patent
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Sep 7, 2010
Grant Date -
Jun 25, 2009
app pub date -
Nov 19, 2008
filing date -
Dec 21, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
AM (Amplitude Modulation) demodulation system (36) for an RFID reader device (31), of the type comprising a demodulator (6) for receiving from a RFID tag (11) an AM (Amplitude Modulation) wave (20) having a predetermined frequency (f) and for retrieving, from the AM wave (20), a demodulated output (6a) associated to predetermined positive or negative Amplitudes of said AM wave (20). The AM demodulation system comprises at least a second demodulator (26) for receiving the AM wave (20) and retrieving a second demodulated output (26a) associated to Amplitudes opposite to the predetermined positive or negative Amplitudes and a block (27) having, in input, the demodulated output (6a) and the second demodulated output (26a) and returning, in output, an enforced demodulated output (30) with a frequency (f1) greater than the predetermined frequency (f).
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