Contactless IC card system

Details Contactless IC card system Contactless IC card system

2007-10-16

2007-10-16

Kinkead, Arnold (Department: 2817)

Modulators

Pulse or interrupted continuous wave modulator

Pulse amplitude modulator

C332S116000, C375S295000, C375S296000, C375S297000

Reexamination Certificate

active

11226562

ABSTRACT:
In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output means for outputting a first output signal having a predetermined phase with respect to that of an input signal, a second signal output means for outputting a second output signal having a predetermined phase with respect to that of the input signal, gate means for gating at least the second output signal, calculation means for adding, or subtracting the first output signal and the second output signal; and control means for controlling the operation of the gate means in response to a logic level of input data.

REFERENCES:
patent: 2301160 (1942-11-01), Finch
patent: 3206673 (1965-09-01), Hooker et al.
patent: 5457811 (1995-10-01), Lemson
patent: 6166971 (2000-12-01), Tamura et al.

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