Validation of the presence of an electromagnetic transponder in the field of an amplitude demodulation reader
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United States of America Patent
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-
Feb 28, 2006
Grant Date -
Jan 24, 2002
app pub date -
May 11, 2001
filing date -
May 12, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A terminal for generating an electromagnetic field adapted to communicating with at least one transponder, and a method for controlling such a terminal including: an oscillating circuit adapted to being excited by a remote supply signal of the transponder; an amplitude demodulator for detecting possible data transmitted by the transponder; circuitry for regulating the signal phase in the terminal's oscillating circuit on a reference value; circuitry for measuring variables linked to the current in the oscillating circuit and to the voltage thereacross; and circuitry for comparing current values of these variables to predetermined values, to determine the presence of a transponder.
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