Contactless IC card system
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United States of America Patent
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Oct 27, 2009
Grant Date -
Jul 26, 2007
app pub date -
Mar 19, 2007
filing date -
Jun 10, 1998
priority date (Note) -
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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.
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