COMMUNICATION DEVICE, NON-CONTACT TYPE IC CARD MOUNTING SAME, AND INFORMATION APPARATUS
First Claim
1. A communication device comprising:
- a first transmission circuit having first and second output terminals and outputting carriers from the first and second output terminals in a first mode;
an antenna circuit including a node, an inductor having one end connected to the node and having the other end connected to the second output terminal of the first transmission circuit, and at least one capacitor connected between the node and the first output terminal of the first transmission circuit;
a second transmission circuit connected to the node of the antenna circuit and outputting the transmission data in a second mode;
at least one reception circuit connected to the node of the antenna circuit and performing reception processing with respect to data received at the antenna circuit; and
a circuit switch unit forming the antenna circuit as a serial resonance circuit including the inductor and the capacitor in the first mode and forming the antenna circuit as a parallel resonance circuit including the inductor and the capacitor in the second mode.
1 Assignment
0 Petitions
Accused Products
Abstract
A communication device able to share one antenna and in addition able to sufficiently exhibit characteristics of a function as a reader, writer and a card function, a non-contact type IC card provided with that, and an information apparatus, wherein the device has a first transmission circuit 220 having first and second output terminals and outputting a carrier from the first and second output terminals in a first mode; an antenna circuit 210 including a node ND210, an inductor 211 having one end connected to the node, and having the other end connected to the second output terminal of the first transmission circuit, and a capacitor 212 connected between the node and the first output terminal of the first transmission circuit; a second transmission circuit 230 connected to the node of the antenna circuit and outputting the transmission data in a second mode; at least one reception circuit 240 connected to the node of the antenna circuit and performing reception processing with respect to data received at the antenna circuit; and a circuit switch unit 280 forming the antenna circuit as a serial resonance circuit including the inductor and the capacitor in the first mode and forming the antenna circuit as a parallel resonance circuit including the inductor and the capacitor in the second mode.
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Citations
24 Claims
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1. A communication device comprising:
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a first transmission circuit having first and second output terminals and outputting carriers from the first and second output terminals in a first mode; an antenna circuit including a node, an inductor having one end connected to the node and having the other end connected to the second output terminal of the first transmission circuit, and at least one capacitor connected between the node and the first output terminal of the first transmission circuit; a second transmission circuit connected to the node of the antenna circuit and outputting the transmission data in a second mode; at least one reception circuit connected to the node of the antenna circuit and performing reception processing with respect to data received at the antenna circuit; and a circuit switch unit forming the antenna circuit as a serial resonance circuit including the inductor and the capacitor in the first mode and forming the antenna circuit as a parallel resonance circuit including the inductor and the capacitor in the second mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-contact type IC card comprising:
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a first transmission circuit having first and second output terminals and outputting carrier data from the first and second output terminals in a reader/writer mode, an antenna circuit including a node, an inductor having one end connected to the node and having the other end connected to the second output terminal of the first transmission circuit, and at least one capacitor connected between the node and the first output terminal of the first transmission circuit; a second transmission circuit connected to the node of the antenna circuit and modulating in load of the transmission data in the card mode; at least one reception circuit connected to the node of the antenna circuit and performing reception processing with respect to the data received at the antenna circuit; a circuit switch unit forming the antenna circuit as a serial resonance circuit including the inductor and the capacitor in the reader/writer mode in response to a mode control signal and forming the antenna circuit as a parallel resonance circuit including the inductor and the capacitor in the card mode; a memory; and a control unit for selectively supplying the transmission data to the first transmission circuit or second transmission circuit, performing predetermined processing with respect to the reception data of the reception circuit, and performing access control of the memory. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An information apparatus having a communication function with a communication network, comprising:
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a communication device having a reader/writer function and a card function, the communication device having a first transmission circuit having first and second output terminals and outputting carriers from the first and second output terminals in the first mode, an antenna circuit including a node, an inductor having one end connected to the node and having the other end connected to the second output terminal of the first transmission circuit, and at least one capacitor connected between the node and the first output terminal of the first transmission circuit, a second transmission circuit connected to the node of the antenna circuit and outputting the transmission data in the second mode, at least one reception circuit connected to the node of the antenna circuit and performing reception processing with respect to the data received at the antenna circuit, and a circuit switch unit forming the antenna circuit as a serial resonance circuit including the inductor and the capacitor in the first mode and forming the antenna circuit as a parallel resonance circuit including the inductor and the capacitor in the second mode. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification