Information processing device
First Claim
1. An information processing device comprising:
- an antenna circuit; and
a reader/writer device including a received signal generating circuit, a microcomputer, a transmitted signal generating circuit, a level detecting circuit, and a D/A converter, wherein the received signal generating circuit is connected to the microcomputer and the antenna circuit;
the transmitted signal generating circuit is connected to the microcomputer and the antenna circuit;
the D/A converter is connected to the microcomputer and the antenna circuit;
the level detecting circuit is connected to the microcomputer and the antenna circuit; and
the antenna circuit includes an antenna, a resonant capacitor, and a variable capacitor.
1 Assignment
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Accused Products
Abstract
An information processing device of the invention has an antenna circuit, and a reader/writer device provided with a received signal generating circuit, a microcomputer, a transmitted signal generating circuit, a level detecting circuit, and a D/A converter. The received signal generating circuit is connected to the microcomputer and the antenna circuit, the transmitted signal generating circuit is connected to the microcomputer and the antenna circuit, the D/A converter is connected to the microcomputer and the antenna circuit, the level detecting circuit is connected to the microcomputer and the antenna circuit, and the antenna circuit has an antenna, a resonant capacitor, and a variable capacitor.
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Citations
40 Claims
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1. An information processing device comprising:
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an antenna circuit; and
a reader/writer device including a received signal generating circuit, a microcomputer, a transmitted signal generating circuit, a level detecting circuit, and a D/A converter, wherein the received signal generating circuit is connected to the microcomputer and the antenna circuit;
the transmitted signal generating circuit is connected to the microcomputer and the antenna circuit;
the D/A converter is connected to the microcomputer and the antenna circuit;
the level detecting circuit is connected to the microcomputer and the antenna circuit; and
the antenna circuit includes an antenna, a resonant capacitor, and a variable capacitor. - View Dependent Claims (2, 3, 4, 5)
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6. An information processing device comprising:
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an antenna circuit; and
a reader/writer device including a received signal generating circuit, a transmitted signal generating circuit, a level detecting circuit, a first D/A converter, a second D/A converter, a microcomputer, and a matching circuit, wherein the received signal generating circuit is connected to the microcomputer and the antenna circuit;
the transmitted signal generating circuit is connected to the microcomputer and the antenna circuit;
the first D/A converter is connected to the microcomputer and the antenna circuit;
the second D/A converter is connected to the microcomputer and the matching circuit;
the level detecting circuit is connected to the microcomputer and the antenna circuit;
the antenna circuit includes an antenna, a resonant capacitor, and a first variable capacitor; and
the matching circuit includes a second variable capacitor. - View Dependent Claims (7, 8, 9, 10)
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11. An information processing device comprising:
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an antenna circuit including an antenna, a resonant capacitor, and a variable capacitor;
a received signal generating circuit that demodulates a voltage signal received by the antenna circuit and outputs the demodulated voltage signal to a microcomputer;
a transmitted signal generating circuit that modulates a voltage signal outputted from the microcomputer and transmits the modulated voltage signal to the antenna circuit;
a D/A converter for outputting a voltage signal for changing capacitance of the variable capacitor; and
a level detecting circuit that detects an output value of the antenna circuit when the modulated voltage signal and the voltage signal for changing capacitance of the variable capacitor from the D/A converter are inputted and that outputs the output value to the microcomputer. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An information processing device comprising:
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an antenna circuit including an antenna, a resonant capacitor, and a first variable capacitor;
a received signal generating circuit that demodulates a voltage signal received by the antenna circuit and outputs the demodulated voltage signal to a microcomputer;
a transmitted signal generating circuit that modulates a voltage signal outputted from the microcomputer and transmits the modulated voltage signal to the antenna circuit;
a matching circuit including a second variable capacitor;
a first D/A converter for outputting a voltage signal for changing capacitance of the first variable capacitor;
a second D/A converter for outputting a voltage signal for changing capacitance of the second variable capacitor; and
a level detecting circuit that detects an output value of the antenna circuit when the modulated voltage signal and the voltage signal for changing capacitance of the first variable capacitor from the first D/A converter are inputted and that outputs the output value to the microcomputer. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method for calibrating a resonant frequency of an information processing device,
said information processing device comprising: -
an antenna circuit including a variable capacitor;
a transmitted signal generating circuit connected to a microcomputer and the antenna circuit;
a D/A converter connected to the microcomputer and the variable capacitor; and
a level detecting circuit connected to the microcomputer and the antenna circuit, said method comprising the steps of;
outputting first signal from the antenna circuit in accordance with a signal outputted from the transmitted signal generating circuit to the antenna circuit;
changing a signal outputted from the antenna circuit to second signal by changing an outputted voltage from the D/A converter to the variable capacitor;
setting an output voltage of a signal outputted from the antenna circuit by outputting signals to the transmitted signal generating circuit and the D/A converter from the microcomputer by inputting voltage signals of the first signal and the second signal outputted from the antenna circuit to the microcomputer via the level detecting circuit. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A method for calibrating a resonant frequency of an information processing device,
said information processing device comprising: -
an antenna circuit including a first variable capacitor;
a transmitted signal generating circuit connected to a microcomputer and the antenna circuit;
a matching circuit including a second variable capacitor;
a first D/A converter connected to the microcomputer and the first variable capacitor; and
a second D/A converter connected to the microcomputer and the second variable capacitor; and
a level detecting circuit connected to the microcomputer and the antenna circuit, said method comprising the steps of;
outputting first signal from the antenna circuit in accordance with a signal outputted from the transmitted signal generating circuit to the antenna circuit;
changing a signal outputted from the antenna circuit to second signal by changing an outputted voltage from the first D/A converter to the first variable capacitor;
setting an output voltage of a signal outputted from the antenna circuit by outputting a signal to the transmitted signal generating circuit and the first D/A converter from the microcomputer by inputting voltage signals of the first signal and the second signal outputted from the antenna circuit to the microcomputer via the level detecting circuit;
outputting third signal from the antenna circuit in accordance with a signal outputted from the transmitted signal generating circuit to the antenna circuit;
changing a signal outputted from the antenna circuit to fourth signal by changing an outputted voltage from the second D/A converter to the second variable capacitor;
setting an output voltage of a signal outputted from the antenna circuit by outputting signals to the transmitted signal generating circuit and the second D/A converter from the microcomputer by inputting voltage signals of the third signal and the fourth signal outputted from the antenna circuit to the microcomputer via the level detecting circuit. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A method for calibrating a resonant frequency of an information processing device,
said information processing device comprising: -
an antenna circuit including a first variable capacitor;
a transmitted signal generating circuit connected to a microcomputer and the antenna circuit;
a matching circuit including a second variable capacitor;
a first D/A converter connected to the microcomputer and the first variable capacitor; and
a second D/A converter connected to the microcomputer and the second variable capacitor; and
a level detecting circuit connected to the microcomputer and the antenna circuit, said method comprising the steps of;
outputting first signal from the antenna circuit in accordance with a signal outputted from the transmitted signal generating circuit to the antenna circuit;
changing a signal outputted from the antenna circuit to second signal by changing an outputted voltage from the second D/A converter to the second variable capacitor;
setting an output voltage of a signal outputted from the antenna circuit by outputting a signal to the transmitted signal generating circuit and the second D/A converter from the microcomputer by inputting voltage signals of the first signal and the second signal outputted from the antenna circuit to the microcomputer via the level detecting circuit;
outputting third signal from the antenna circuit in accordance with a signal outputted from the transmitted signal generating circuit to the antenna circuit;
changing a signal outputted from the antenna circuit to fourth signal by changing an outputted voltage from the first D/A converter to the first variable capacitor;
setting an output voltage of a signal outputted from the antenna circuit by outputting signals to the transmitted signal generating circuit and the first D/A converter from the microcomputer by inputting voltage signals of the third signal and the fourth signal outputted from the antenna circuit to the microcomputer via the level detecting circuit. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification