Contactless IC card

Communications: electrical – Selective – Interrogation response

Reexamination Certificate

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Details

C340S010100, C327S543000

Reexamination Certificate

active

10915391

ABSTRACT:
A contactless IC card includes a reference voltage circuit, a judging circuit for monitoring a reference voltage that is outputted from the reference voltage circuit, and a power supply stabilization, unit. The judging circuit judges whether the reference voltage is equal to or higher than a predetermined voltage. When the reference voltage does not reach the predetermined voltage, the power supply stabilization unit supplies energy to the power supply to suppress a steep increase in the power supply voltage, thereby stabilizing the power supply in the contactless IC card and suppressing deterioration of the signal quality.

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Shoichi Masui et al., “TA 9.1 A 13.56MHz CMOS RF Identification Transponder Integrated Circuit With A Dedicated CPU”, IEEE International Solid-State Circuits Conference, 1999.

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