Non-contact integrated circuit reader comprising a low power...

Details Non-contact integrated circuit reader comprising a low power... Non-contact integrated circuit reader comprising a low power...

2005-06-14

2005-06-14

Frech, Karl D. (Department: 2876)

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Records

Conductive

Reexamination Certificate

active

06905074

ABSTRACT:
A contactless integrated circuit reader includes an antenna coil for emitting an oscillating magnetic field, and circuitry for detecting the presence of a contactless integrated circuit within a communication perimeter of the reader without receiving an identification message. The detection circuitry include circuitry for emitting short magnetic field pulses, circuitry for extracting from the antenna coil an envelope signal having envelope pulses corresponding to the magnetic field pulses, and circuitry for monitoring the amplitude of the envelope pulses, arranged for detecting a variation in the amplitude of the envelope pulses representative of the entry of the contactless integrated circuit into the communication perimeter of the reader.

REFERENCES:
patent: 5352877 (1994-10-01), Morley
patent: 0 391 559 (1990-10-01), None
patent: 2 780 585 (1999-12-01), None

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