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公开(公告)号：JP2003223101A
公开(公告)日：2003-08-08
申请号：JP2002262662
申请日：2002-09-09
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BALTHAZAR PIERRE
Abstract: PROBLEM TO BE SOLVED: To provide a method for transmitting multimedia data by using watermarking key for confirming a transmission source and preventing data from being falsified during the transmission. SOLUTION: The method for transmitting secure digital data between a sender and a receiver is provided with a step for authenticating the receiver by a symmetrical authentication key sharing algorithm with no transmission of the key, a step for watermarking the data by using the authentication key as the watermarking key and a step for transmitting the watermarked data. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2003198529A
公开(公告)日：2003-07-11
申请号：JP2002296060
申请日：2002-10-09
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , PLAZA LAURENT
Abstract: PROBLEM TO BE SOLVED: To provide a method and a circuit for regenerating a secret quantity based on an identifier of an integrated circuit. SOLUTION: A first digital word (12) derived from a physical parameter network is coupled (13) with a second word stored in a non-volatile memory element (14). COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2002033680A
公开(公告)日：2002-01-31
申请号：JP2001140159
申请日：2001-05-10
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC
Abstract: PROBLEM TO BE SOLVED: To provide a novel control method for a read/write terminal that unsharpens the read/write terminal against a demodulation gap of data received from a transponder entering the field of the read/write terminal. SOLUTION: This invention provides the method for controlling the terminal generating an electromagnetic field that is provided with a circuit to control the phase of a signal from an oscillating circuit and uses a signal to oscillate the oscillation circuit while including a method for comparing a current variable linked to current of the oscillation circuit and (voltage applied to the oscillation circuit with a prescribed value and for detecting the presence of the transponder in the electromagnetic field.
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14.发明专利
公开(公告)号：JP2002009658A
公开(公告)日：2002-01-11
申请号：JP2001141586
申请日：2001-05-11
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC
Abstract: PROBLEM TO BE SOLVED: To provide a terminal that generates an electromagnetic field for communication with at least one transponder, and to provide a method for controlling this terminal. SOLUTION: The terminal is provided with an oscillation circuit, that is excited by a remote supply signal from the transponder, a phase demodulator for detecting data sent from the transponder, a means for regulating a signal phase of the oscillation circuit of the terminal to be a reference value, a means for measuring a variable linked with a current and a voltage of the oscillation circuit, and a means that compares the present value of the variable with a prescribed value to decide whether the transponder is present.
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公开(公告)号：JP2001308758A
公开(公告)日：2001-11-02
申请号：JP2001021513
申请日：2001-01-30
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC
Abstract: PROBLEM TO BE SOLVED: To optimize the power consumption of an electromagnetic transponder read/write terminal. SOLUTION: A terminal for generating an electromagnetic field so as to collaborate with at least one transponder when transponders entered the electromagnetic field of the terminal, includes an oscillating circuit composed for receiving a high frequency alternative current excitation voltage, a circuit to adjust the signal phase of the oscillating circuit in terms of a reference value, a circuit to determine present information related to electromagnetic coupling between the transponder and the terminal, and a circuit to adapt the electromagnetic field electric power according to at least the present information.
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Patent Agency Ranking16.发明专利
公开(公告)号：JP2001086030A
公开(公告)日：2001-03-30
申请号：JP2000218501
申请日：2000-07-19
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , ENGUENT JEAN-PIERRE
Abstract: PROBLEM TO BE SOLVED: To use a transponder and/or a terminal exclusively in a comparatively remote area by setting the characteristics of component elements of an oscillation circuit of the transponder to quickly attenuate the coupling coefficient between the oscillation circuits of both terminal and transponder when the distance set between the transponder and the terminal is smaller than a prescribed value. SOLUTION: When the distance between a transponder 10 and a terminal 1 is decreased, the coupling coefficient between the oscillation circuit of the transponder 10 and the terminal 1 is reduced quickly. The best measure of this problem shows that the optimum coupling point must be approximately equal to the center of a desirable distance operation area. When the distance between the transponder 10 and the terminal 1 deviates from the distance to the operation area, the coupling coefficient is quickly reduced and no power is supplied to the transponder 10 thereafter. The largest operation point is selected so that the voltage between the input terminals 11 and 12 of the transponder 10 lies in the interval between the voltage for which the least operating voltage of the transponder 10 corresponds to an inflection point and the voltage of the parallel oscillation circuit when the optimum coupling is secured between both oscillation circuits.
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公开(公告)号：JP2003248578A
公开(公告)日：2003-09-05
申请号：JP2002347277
申请日：2002-11-29
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , PLAZA LAURENT
Abstract: PROBLEM TO BE SOLVED: To provide a method and a circuit for generating a secret quantity based on an identifier of an integrated circuit. SOLUTION: A first digital word is generated from a physical parameter network, and the first word is submitted to at least one shift register, the output of the shift register generating the secret quantity. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2003243525A
公开(公告)日：2003-08-29
申请号：JP2002257486
申请日：2002-09-03
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART SYLVIE , WUIDART LUC , BARDOUILLET MICHEL , BALTHAZAR PIERRE
IPC: G01K7/00 , G06F12/14 , G06F13/42 , G06F21/06 , G06K19/073 , H01L21/822 , H01L27/04
Abstract: PROBLEM TO BE SOLVED: To provide a method and a circuit for detecting the variation of at least one environmental parameter of an integrated circuit. SOLUTION: A propagation delay of an edge in a delay element sensitive to the variation of the environmental parameter is measured to compare a present or a measured delay with at least one reference value. COPYRIGHT: (C)2003,JPO
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公开(公告)号：JP2002009661A
公开(公告)日：2002-01-11
申请号：JP2001140158
申请日：2001-05-10
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC
Abstract: PROBLEM TO BE SOLVED: To provide a method for reducing a time required to initialize and set up communication between a read/write terminal for electromagnetic transponders and the one transponder entering a field of the terminal or more, that is, to provide a method for decreasing consecutive times required for the read/write terminal, in order to decide and identify all the transponders present in the terminal field at a specific time. SOLUTION: This invention provides the method for establishing communication between devices that include the terminal, which is adapted so as to cooperate with the transponder, when at least the one transponder enters the terminal field and uses an oscillation circuit to generate a high-frequency electromagnetic field, a circuit that adjusts a signal phase of the oscillation circuit with respect to a reference value, and a circuit that evaluates a minimum number of the transponders present in the field, on the basis of the measurement of a current of the oscillation circuit.
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公开(公告)号：JP2000341884A
公开(公告)日：2000-12-08
申请号：JP2000104893
申请日：2000-04-06
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , ENGUENT JEAN-PIERRE
Abstract: PROBLEM TO BE SOLVED: To attain reduction in thermal effect related to remote power supply to a transponder through a readout/writing terminal, by detuning a transponder oscillating circuit when the transponder has a very close coupling relation to the readout/writing terminal. SOLUTION: This transponder 30 is constituted of a parallel oscillating circuit including an inductance L2 and a capacitor C2' between two terminals 11', 12' of the circuit. Between the terminals 11', 12', a capacitor C3 and a switch (for example, MOS transistor) K1 are serially connected. A switch K1 is controlled by a circuit 31 and is closed at the time of tuning operation. When it is in a closely coupled condition with the terminal, or respective antennas are positioned at a distance of less than 2 cm, for example, the oscillating circuit of the transponder is detuned (the switch K1 is off). It is thus possible to prevent heat generation of the transponder in radio-supplying operating power to the transponder approaching the terminal from the terminal.
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