Contactless integrated circuit reader
DC CAFC
First Claim
Patent Images
1. A device in order to transmit/receive data by inductive coupling comprising:
- an antenna circuit to generate a magnetic field; and
an excitation circuit for delivering an alternating excitation signal to the antenna circuit,the device being configured to operate in a first operating mode and a second operating mode,when in the first operating mode, the device modulates the excitation signal when data is transmitted, andwhen in the second operating mode, the device applies a load modulation signal with two states to the antenna circuit when data is transmitted, so as to simulate the operation of a contactless integrated circuit, the load modulation signal being configured to disturb a magnetic field generated by another device in order to transmit/receive data by inductive coupling and being configured to be detected by the other device as if the load modulation signal were a load modulation signal applied to an antenna load modulation switch of a contactless integrated circuit.
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4 Petitions
Accused Products
Abstract
The present invention relates to a contactless integrated circuit reader operating by inductive coupling, comprising an antenna circuit for sending an alternating magnetic field, circuits for applying an alternating excitation signal to the antenna circuit and circuits for modulating the amplitude of an antenna signal present in the antenna circuit according to data to be sent. The reader includes circuits for simulating the operation of a contactless integrated circuit, arranged to inhibit the application of the excitation signal to the antenna circuit and to apply a load modulation signal to the antenna circuit when data is to be sent. The load modulation signal is capable of disturbing a magnetic field sent by another contactless integrated circuit reader and of being detected by the other contactless integrated circuit reader.
72 Citations
47 Claims
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1. A device in order to transmit/receive data by inductive coupling comprising:
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an antenna circuit to generate a magnetic field; and an excitation circuit for delivering an alternating excitation signal to the antenna circuit, the device being configured to operate in a first operating mode and a second operating mode, when in the first operating mode, the device modulates the excitation signal when data is transmitted, and when in the second operating mode, the device applies a load modulation signal with two states to the antenna circuit when data is transmitted, so as to simulate the operation of a contactless integrated circuit, the load modulation signal being configured to disturb a magnetic field generated by another device in order to transmit/receive data by inductive coupling and being configured to be detected by the other device as if the load modulation signal were a load modulation signal applied to an antenna load modulation switch of a contactless integrated circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 22)
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13. A method for transferring data from a first contactless integrated circuit reader to a second contactless integrated circuit reader, the first and second readers operating by inductive coupling, each of the first and second readers comprising an antenna circuit that generates a magnetic field and an excitation circuit that delivers an alternating excitation signal to the respective antenna circuit, the method comprising:
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the first reader applying a data-carrying signal with two states to the antenna circuit of the first reader when data is to be transmitted to the second reader; and the second reader receiving the data-carrying signal by inductive coupling and extracting data from the received data-carrying signal. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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23. A method for transferring data from a first contactless integrated circuit reader to a second contactless integrated circuit reader and for transferring data from the second contactless integrated circuit reader to the first contactless integrated circuit reader, the first and second contactless readers operating by inductive coupling, each of the first and second contactless readers including an antenna circuit to generate a magnetic field and an excitation circuit that delivers an alternating excitation signal to the antenna circuit, the method comprising:
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when data is transferred from the first to the second reader; the second reader generating a magnetic field; the first reader applying a data-carrying load modulation signal with two states to the antenna circuit of the first reader, the load modulation signal disturbing the magnetic field generated by the second reader; and the second reader extracting the data-carrying load modulation signal from the antenna coil of the second reader and extracting data from the data-carrying load modulation signal; and when data is transferred from the second to the first reader; the second reader generating a magnetic field and modulating the amplitude of the magnetic field in accordance with data to be transmitted, and the first reader receiving an image signal of the amplitude-modulated magnetic field and extracting data from the image signal. - View Dependent Claims (24, 25, 26, 27)
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28. A contactless integrated circuit reader comprising:
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an antenna circuit that generates a magnetic field; and an excitation circuit to deliver an alternating excitation signal to the antenna circuit, the reader including a first operating mode and a second operating mode, when in the first operating mode, the reader is configured to exchange data with a contactless integrated circuit, and when in the second operating mode, the reader is configured to exchange data with another contactless integrated circuit reader, the reader includes one of a bit and a flag to switch the reader from one of the first and second operating modes to the other of the first and second operating modes. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A data transmission system comprising a first device and a second device that each exchange data by inductive coupling, each device comprising:
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an antenna circuit that generates a magnetic field; an excitation circuit that delivers an alternating excitation signal to the antenna circuit, wherein the first device is configured to perform at least one operation in each of the three following groups of operations and the second device is configured to perform at least one complementary operation in each of the three following groups of operations, depending whatever operation is acceptable to the first device; operations for transmitting data; transmitting data to the other device by applying a load modulation signal with two states to the antenna circuit, the load modulation signal being capable of disturbing the magnetic field generated by the other device and of being detected by the other device as if the load modulation signal were a load modulation signal applied to an antenna load modulation switch of a contactless integrated circuit, and transmitting data to the other device by modulating the amplitude of the generated magnetic field, as if the other device were a contactless integrated circuit; operations for receiving data; not generating the magnetic field when data is to be received from the other device, and generating the magnetic field when data is to be received from the other device; and operations when no data is to be transmitted and when no data is to be received; not generating the magnetic field, and generating the magnetic field. - View Dependent Claims (37, 38, 39, 40, 41)
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42. A data transmission system comprising a first device and a second device that each transmit/receive data by inductive coupling, each device comprising:
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an antenna circuit that generates a magnetic field; and an excitation circuit that delivers an alternating excitation signal to the antenna circuit, wherein the first device is configured to perform at least two of the following operations and the second device is configured to be responsive to at least one such operation when performed by the first device; transmitting data to another device by applying a load modulation signal with two states to the antenna circuit, the load modulation signal being capable of disturbing the magnetic field generated by the other device and of being detected by the other device as if the load modulation signal were a load modulation signal applied to an antenna load modulation switch of a contactless integrated circuit; transmitting data to another device by modulating the amplitude of the generated magnetic field, as if the other device were a contactless integrated circuit; not generating the magnetic field when no data is to be transmitted and when no data is to be received; not generating the magnetic field when data is to be received from another device; and generating the magnetic field when data is to be received from another device. - View Dependent Claims (43, 44, 45, 46, 47)
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Specification
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Litigation Data
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Current AssigneeVerimatrix Incorporated (Verimatrix SA)
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Original AssigneeInside Technologies (Verimatrix SA)
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InventorsCharrat, Bruno, Lepron, Francois
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Primary Examiner(s)Garber, Wendy R.
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Assistant Examiner(s)BROWN, VERNAL U
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Application NumberUS10/411,008Publication NumberTime in Patent Office1,237 DaysField of Search340/10.1, 340/10.3, 340/10.5, 340/825.63, 340/825.72, 340/825.69, 340/10.34, 340/10.4, 340/505, 340/572.1, 340/572.2, 340/572.7, 235/444, 235/462.46, 235/462.49, 235/449US Class Current340/10.1CPC Class CodesG06K 7/0008 General problems related to...
