Contactless IC card for preventing incorrect data recovery...

Details Contactless IC card for preventing incorrect data recovery... Contactless IC card for preventing incorrect data recovery...

2005-06-14

2005-06-14

Chin, Stephen (Department: 2634)

Pulse or digital communications

Receivers

Amplitude modulation

C375S316000, C329S349000, C329S347000

Reexamination Certificate

active

06907088

ABSTRACT:
In a contactless IC card that performs envelope detection on an ASK-modulated carrier wave and demodulates the carrier wave to recover data piggybacked thereon, demodulation is suspended during periods where there is no possibility of a change of a data value (from data 0 to data 1, or from data 1 to data 0) in the digital data piggybacked on the carrier wave. In so doing, incorrect data recovery can be prevented even when noise arises in power supply voltage waveform due to power consumption of an internal memory or the like.

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