Semiconductor integrated circuit

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Reexamination Certificate

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Reexamination Certificate

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06848620

ABSTRACT:
A semiconductor integrated circuit is provided to allow a stable operation even in a short distance where an IC card is in contact with a reader/writer. In a semiconductor integrated circuit for a noncontact IC card that obtains driving power supply by carrying superimposed data, obtained voltage does not become overvoltage and data can be demodulated with stability regardless of a change in communication distance. Inputs of a system (including a rectifier circuit and a power supply circuit) producing power supply from an antenna coil of the IC card which receives radio waves transmitted from a reader/writer, and of a demodulator circuit are connected via a path separated from the output of the rectifier circuit. Thus, a power supply voltage range can be set within a permissible value and a rate of change in input of the demodulator circuit can be obtained regardless whether the communication distance is short or long.

REFERENCES:
patent: 5349173 (1994-09-01), Scheckel et al.
patent: 5862174 (1999-01-01), Yokota et al.
patent: 5889273 (1999-03-01), Goto
patent: 6070804 (2000-06-01), Miyamoto
patent: 0 897 162 (1999-02-01), None
patent: 2 751 148 (1998-01-01), None
patent: 10240889 (1998-09-01), None
patent: 10322250 (1998-12-01), None
patent: 11066248 (1999-03-01), None
patent: 11215026 (1999-08-01), None
patent: 2001125653 (2001-05-01), None
patent: 202236890 (2002-08-01), None
patent: 9802840 (1998-01-01), None
patent: WO 9957881 (1999-11-01), None

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