Electromagnetic transponder reader

Details Electromagnetic transponder reader Electromagnetic transponder reader

2005-01-25

2005-01-25

Pascal, Robert (Department: 2817)

Demodulators

Amplitude modulation demodulator

Input signal combined with local oscillator or carrier...

C340S010400, C340S010100

Reexamination Certificate

active

06847256

ABSTRACT:
A method and a circuit for demodulating a signal transmitted by an electromagnetic transponder, including a sensor of a variable which is a function of the load formed by the transponder on an oscillating circuit, a phase demodulator and an amplitude demodulator at least functionally in parallel and receiving a signal coming from said sensor, a summer of the results provided by the demodulators, and a delay element in series with a first one of said demodulators, to compensate for a possible propagation time difference therebetween.

REFERENCES:
patent: 6028503 (2000-02-01), Preishuberpflügl et al.
patent: 6181198 (2001-01-01), Poletto et al.
patent: 6636146 (2003-10-01), Wehoski
patent: 6650226 (2003-11-01), Wuidart et al.
patent: 20020011922 (2002-01-01), Wuidart
patent: 1 043 679 (2000-10-01), None
French Search Report from French Patent Application 02/07000, filed Jun. 4, 2002.

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