Receiver circuit and method for a contactless identification...

Details Receiver circuit and method for a contactless identification... Receiver circuit and method for a contactless identification...

2001-11-08

2003-05-20

Pitts, Harold I. (Department: 2876)

Registers

Coded record sensors

Particular sensor structure

C235S492000

Reexamination Certificate

active

06565001

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to the field of contactless systems and more particularly to a receiver circuit and method for a contactless identification system.
BACKGROUND OF THE INVENTION
Contactless identification systems and smart cards do not have internal power sources. As a result they require a receiver circuit that captures both power and information. Commonly, these systems amplitude modulate (AM) the carrier wave to transmit information. Unfortunately, the present receivers have problems receiving information over a range distances between the card and the reader.
Thus there exists a need for a receiver circuit that increases the capability of the card to “see” the reader over a wide range of distances.


REFERENCES:
patent: 4555792 (1985-11-01), Vantol

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