Contactless IC card
First Claim
Patent Images
1. A contactless IC card to which power is externally supplied in a contactless manner, comprising:
- a regulator for attenuating, in said supplied power, a signal component in a band unwanted for demodulation of an RX signal; and
a demodulation circuit for demodulating said RX signal from said power in which said signal component in said unwanted band has been attenuated by said regulator.
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Abstract
A contactless IC card, to which power is externally supplied in a contactless manner, includes a shunt regulator and a demodulation circuit. The shunt regulator attenuates, in the supplied power, a signal component in a band unwanted for demodulating an RX signal. The demodulation circuit demodulates the RX signal from the power in which the signal component in the unwanted band has been attenuated by the regulator.
48 Citations
21 Claims
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1. A contactless IC card to which power is externally supplied in a contactless manner, comprising:
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a regulator for attenuating, in said supplied power, a signal component in a band unwanted for demodulation of an RX signal; and
a demodulation circuit for demodulating said RX signal from said power in which said signal component in said unwanted band has been attenuated by said regulator.
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2. A contactless IC card comprising:
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an antenna coil; and
a semiconductor integrated circuit, wherein said semiconductor integrated circuit includes;
a rectifier for generating power by rectifying a signal received by said antenna coil;
a shunt regulator for consuming a component in a low region of said power;
a demodulator for extracting an RX signal from said power in which said component in said low region has been consumed by said shunt regulator; and
a digital signal processor for receiving said power obtained through rectification by said rectifier and processing said RX signal extracted by said demodulator. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A contactless IC card comprising:
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an antenna coil; and
a semiconductor integrated circuit, wherein said semiconductor integrated circuit includes an RX demodulator and a signal processor, said RX demodulator includes;
a first rectifier for generating first power by rectifying a signal received by said antenna coil;
a shunt regulator for consuming a component in a low region of said first power; and
a demodulator for extracting an RX signal from said first power in which said component in said low region has been consumed by said shunt regulator, said signal processor includes;
a second rectifier for generating second power by rectifying the signal received by said antenna coil; and
a digital signal processor for receiving said second power and processing said RX signal extracted by said demodulator. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification