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

IPC: G06K19/10 ,  G07F7/10 ,  H01L23/544 ,  H01L23/58 ,  H04L9/08 ,  H04L9/10

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

公开(公告)号：JP2000332648A

公开(公告)日：2000-11-30

申请号：JP2000106525

申请日：2000-04-07

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN-PIERRE

IPC: G06K19/07 ,  G06K7/00 ,  G06K17/00 ,  H02J17/00 ,  H04B1/59 ,  H04B5/02

Abstract: PROBLEM TO BE SOLVED: To reduce heating of a transponder when an operation power to a proximate transponder from a terminal is supplied by a radio by providing a means for detuning an oscillation circuit from a specific transmission frequency when the transponder approaches the terminal. SOLUTION: A terminal 1' is between an output terminal 2p of an amplifier, that is, an antenna coupler 3, and a terminal 2m in a reference potential (generally a ground), and includes an oscillation circuit consisting of a capacity parts 24, a resistor R1 and a serial impedance, that is, an antenna L1. Then, when the oscillation circuit of the terminal 1' and/or the oscillation circuit of a transponder are in a very close coupling relationship, in order to detune these, a phase of a current of the antenna L1 is adjusted to a reference signal REF. This adjustment is executed by changing a capacitance C1 of the oscillation circuit of the terminal 1' and maintaining the antenna current to a constant phase relationship with the reference signal.

公开(公告)号：JP2003198528A

公开(公告)日：2003-07-11

申请号：JP2002294697

申请日：2002-10-08

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  PLAZA LAURENT

IPC: G06K19/10 ,  G07F7/10 ,  H01L23/544 ,  H01L23/58 ,  H04L9/08 ,  H04L9/10

Abstract: PROBLEM TO BE SOLVED: To provide a method for generating secret quantities by an integrated circuit according to the destination of these secret quantities. SOLUTION: In a method and a circuit for generating several secret quantities by the integrated circuit according to the destination of these secret quantities, a first digital ward forming a single identifier of the integrated circuit chip and coming from a physical parameter network is taken into account and this identifier is individualized according to an application. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2000228637A

公开(公告)日：2000-08-15

申请号：JP36095499

申请日：1999-12-20

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL

IPC: G01S13/78 ,  G06K19/07 ,  H04B1/59 ,  H04B5/02

Abstract: PROBLEM TO BE SOLVED: To avoid a transmission gap (distance where a terminal can detect a transponder) and also to maintain a maximum system range by providing two capacitive modulating means and connecting the reference terminal of each modulating means to the reference supply potential of an electronic circuit on the secondary side of a rectifying means. SOLUTION: This transponder 10' is formed from an oscillation circuit consisting of an inductance L2 and a capacitor C2 parallelly connected between two alternating current input terminals 11 and 12 of a rectifier bridge 13 consisting of rectifier diodes D1 to D4. The rectifier output terminals 14 and 15 of the bridge 13 supply a service voltage to an electronic circuit 17 such as a processor P through a filtering capacitor Ca. Two capacitive modulating means (consisting of C3, K1, C4 and K2) respectively connected to the terminals 11 and 12 of both ends of a dielectric element L2 of an oscillation circuit are included, and the reference terminal of each modulating means is connected to a reference supply potential 15 of the circuit 17 on the secondary side of a rectifying means 13.

公开(公告)号：JP2001007730A

公开(公告)日：2001-01-12

申请号：JP2000103473

申请日：2000-04-05

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN-PIERRE

IPC: G06K17/00 ,  G01S13/75 ,  G01S13/76 ,  G01S13/79 ,  G06K7/00 ,  G06K19/07 ,  H02J17/00 ,  H04B1/59 ,  H04L27/02

Abstract: PROBLEM TO BE SOLVED: To realize distance detection between a transponder and a terminal, which is executed on a terminal side and which does not require transmission from the transponder for the evaluation of the distance, by measuring a variable decided by a load formed on the oscillation circuit of the terminal through the means of the transponder. SOLUTION: A terminal 1' is located between the output terminal 2p of an amplifier, namely, an antenna coupler 3 and a prescribed terminal 2m in a reference potential, and it comprises an oscillation circuit formed of a capacitive part 24 and an inductance connected to a resistor R1 in series, namely an antenna L1. Voltage between the connection point 30 of the resistor R1 in the oscillation circuit and the inductance L1 and a ground 2m is measured. A measuring device comprises a capacitor storing voltage measured at a node 30. Voltage between both ends of the capacitor is dropped, as the distance between the terminal and a transponder increases. Voltage stored in the capacitor is sent to the processor of the terminal 1'.

公开(公告)号：JP2000341171A

公开(公告)日：2000-12-08

申请号：JP2000104891

申请日：2000-04-06

Applicant: ST MICROELECTRONICS SA

Inventor： WUIDART LUC ,  BARDOUILLET MICHEL ,  ENGUENT JEAN-PIERRE

IPC: G01S13/74 ,  G06K7/00 ,  G06K19/07 ,  H04B1/59 ,  H04B5/02

Abstract: PROBLEM TO BE SOLVED: To reduce or minimize thermal effect relating to remote power supply to a transponder by a read/write terminal by detuning the oscillation circuits of a terminal and/or the transponder, when they are in a very closely coupled relation. SOLUTION: A read/write terminal 1' of an electromagnetic transponder is equipped with a means for causing an oscillation circuit to be detuned from the carrier frequency. The terminal 1' includes the oscillation circuit, which is located between the output terminal 2p of an amplifier, i.e., an antenna coupler 3 and a terminal 2m with a reference potential and composed of a capacity component 24, a resistance R1, and a series antenna L1. Then the phase of the current of the antenna L1 is adjusted with respect to a reference signal REF. This adjustment is an adjustment of a high-frequency signal, i.e., a carrier signal corresponding to a signal TX having no transmission data and carried out by varying the capacitance C1 of the oscillation circuit of the terminal 1' and holding the antenna current at constant phase relation with the reference signal REF.

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

IPC: G06K19/10 ,  G06F7/58 ,  G07F7/10 ,  G09C1/00

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

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

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

IPC: G08C17/00 ,  G01S13/75 ,  G01S13/76 ,  G01S13/79 ,  G06K7/00 ,  G06K17/00 ,  G06K19/07 ,  H02J17/00

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.

公开(公告)号：JP2000341883A

公开(公告)日：2000-12-08

申请号：JP2000083792

申请日：2000-03-24

Applicant: ST MICROELECTRONICS SA

Inventor： BARDOUILLET MICHEL

IPC: G06K19/07 ,  G06K7/00 ,  H02J17/00

Abstract: PROBLEM TO BE SOLVED: To avoid generation of insufficient power supply and malfunction due to remarkable decrease in minimum supply voltage, by attaching a switched resistive means for changing transponder response to an oscillating circuit between a rectifying means and a one-way conduction means. SOLUTION: To transmit data from a transponder 10' to a readout/writing terminal station, a microcomputer 17 controls a modulating circuit of a resonance circuit (L2, C2). The modulating circuit is disposed on the upstream side of a capacitor Ca and including a resistive electronic switch (resistive switching means). The electronic switch connects a transistor T and a resistor R between a terminal 14 and a ground 15. A one-way conduction means 18 (diode DR) is serially connected between the first terminal 19 of the capacitor Ca and the terminal 14. The cathode of a diode DR is connected with the terminal 19 and its anode is connected with the terminal 14. It is thus possible to avoid generation of insufficient power supply and malfunction to a voltage regulator 16 and the microcomputer 17 due to remarkable decrease in minimum supply voltage.