Contactless IC card system

Details Contactless IC card system Contactless IC card system

2007-03-19

2009-10-27

Mis, David (Department: 2817)

Demodulators

Pulse or interrupted continuous wave demodulator

C329S370000, C375S353000

Reexamination Certificate

active

07609109

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: signal processing means for producing first and second input signals; first clamping circuit for clamping said first input signal; second clamping circuit for clamping said second input signal; first band limiting means for removing a component of said first input signal from an output signal of said first clamping circuit; second band limiting means for removing a component of said second input signal from an output signal of said second clamping circuit; and calculating means for adding, or averaging an output signal of said first band limiting means and an output signal of said second band limiting means.

REFERENCES:
patent: 3210670 (1965-10-01), Jones

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