Contactless IC card

Details Contactless IC card Contactless IC card

2005-11-08

2005-11-08

Zimmerman, Brian (Department: 2635)

Communications: electrical

Selective

Interrogation response

C340S010340, C324S146000, C324S157000, C324S536000

Reexamination Certificate

active

06963269

ABSTRACT:
A contactless IC card having an antenna, a transmit/receive circuit for recovering data (clock) and electric power from a carrier signal received by the antenna, a logic circuit operated with the electric power supplied thereto from the transmit/receive circuit, and a memory. The transmit/receive circuit has a rectifier circuit for outputting data (clock) and rectifier circuits for electric power in such a manner that the carrier signal is inputted to each of the rectifier circuit for outputting data (clock) and the rectifier circuit for electric power. With this configuration, high frequency matching can be optimized separately for the rectifier circuit for outputting data (clock) and the rectifier circuit for electric power. It is also possible to separately optimize adjustments to a voltage of recovered data (clock) and a recovered supply voltage.

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patent: 5649965 (1997-07-01), Pons et al.
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patent: 5798968 (1998-08-01), Lee et al.
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patent: 8171618 (1996-07-01), None
IEEE 1997 International Solid-State Circuit Conference, “A Low-Power CMOS Integrated Circuit for Field-Powered Radio Frequecy Identification Tags”, D. Friedman et al, pp. 294-295.

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