Semiconductor integrated circuit device and contactless IC card

Details Semiconductor integrated circuit device and contactless IC card Semiconductor integrated circuit device and contactless IC card

2008-04-15

2008-04-15

Le, Thien Minh (Department: 2876)

Registers

Records

Conductive

C235S487000

Reexamination Certificate

active

11432378

ABSTRACT:
A semiconductor integrated circuit device (IC) and a contactless IC card including a receiver circuit that is able to stably demodulate information signals superimposed on AC signals from an interrogator. The receiver circuit included in the IC is equipped with antenna terminals, a power supply circuit, and a filter circuit. The information signal from which a high frequency component was eliminated through the filter circuit is input via a capacitor to an inverting input terminal of an operational amplifier and a reference voltage is input to a non-inverting input terminal thereof. After the information signal is fed back through a feedback path to the non-inverting input terminal of the operational amplifier, that signal is amplified and the amplified information signal is binarised by a binarising circuit, thereby data transmitted from the interrogator is demodulated. The contactless IC card comprises an antenna coil and the IC including this receiver circuit.

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