Patents by Inventor Luc Wuidart

Luc Wuidart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Sizing of an electromagnetic transponder system for a dedicated distant coupling operation
    Patent number: 7049935
    Abstract: A system of contactless electromagnetic transmission between a terminal including a series oscillating circuit for generating an electromagnetic field and a transponder including a parallel oscillating circuit, these oscillating circuits being sized so that the coupling coefficient between them rapidly decreases when the distance separating the transponder from the terminal becomes smaller than a predetermined value.
    Type: Grant
    Filed: July 13, 2000
    Date of Patent: May 23, 2006
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Jean-Pierre Enguent
  • Validation of the presence of an electromagnetic transponder in the field of a reader
    Patent number: 7049936
    Abstract: A method for controlling an electromagnetic field generation terminal using a signal for exciting an oscillating circuit, provided with circuitry for regulating the signal phase in the oscillating circuit, including comparing current values of variables linked to the current in the oscillating circuit and to the voltage thereacross with predetermined values, to detect the presence of a transponder in the electromagnetic field.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: May 23, 2006
    Assignee: STMicroelectronics S.A.
    Inventor: Luc Wuidart
  • Electromagnetic field generation device for a transponder
    Patent number: 7046146
    Abstract: A device for generating an electromagnetic field by a first oscillating circuit excited by a high-frequency signal, including, at a distance from the first oscillating circuit, a second passive, unloaded and coreless oscillating circuit, forming an element for concentrating the magnetic flux intended to be intercepted by a transponder by a third oscillating circuit.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: May 16, 2006
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Michel Bardouillet
  • Detection of an electric signature of an electromagnetic transponder
    Patent number: 7046121
    Abstract: The invention concerns a terminal generating a high-frequency electromagnetic field by means of an oscillating circuit, adapted to co-operate with at least a transponder when the latter enters said field, comprising means (37) for regulating the phase of the signal in the oscillating circuit with respect to a reference value, and means for detecting, on the basis of a current measurement in the oscillating circuit and a voltage measurement at the terminals of a capacitive element (31) of said oscillating circuit, an electric signature of a transponder.
    Type: Grant
    Filed: August 9, 2001
    Date of Patent: May 16, 2006
    Assignee: STMicroelectronics S.A.
    Inventor: Luc Wuidart
  • Electromagnetic field generation antenna for a transponder
    Patent number: 7023391
    Abstract: An antenna for generating an electromagnetic field including several planar inductive cells parallel connected in an array and forming, in association with at least one capacitor, an oscillating circuit adapted to being excited by a high-frequency signal.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: April 4, 2006
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Michel Bardouillet
  • Validation of the presence of an electromagnetic transponder in the field of an amplitude demodulation reader
    Patent number: 7005967
    Abstract: A terminal for generating an electromagnetic field adapted to communicating with at least one transponder, and a method for controlling such a terminal including: an oscillating circuit adapted to being excited by a remote supply signal of the transponder; an amplitude demodulator for detecting possible data transmitted by the transponder; circuitry for regulating the signal phase in the terminal's oscillating circuit on a reference value; circuitry for measuring variables linked to the current in the oscillating circuit and to the voltage thereacross; and circuitry for comparing current values of these variables to predetermined values, to determine the presence of a transponder.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: February 28, 2006
    Assignee: STMicroelectronics S.A.
    Inventor: Luc Wuidart
  • One-time programming multiple-level memory cells
    Patent number: 7002832
    Abstract: A multiple-level memory cell including a storage element formed of several polysilicon resistors connected in series between two input/output terminals; and a load in series with said resistive element, the midpoint of this series connection forming a read terminal of the memory cell, and the respective junction points of said resistors of the storage element being accessible.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: February 21, 2006
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Michel Bardouillet
  • Adaptable power supply circuit
    Publication number: 20060014573
    Abstract: A power supply circuit and a transponder having a circuit for rectifying an A.C. voltage and two power storage elements, the rectifying circuit providing a rectified voltage to at least one of the storage elements and an output voltage being provided by at least one of the storage elements, and at least one switching element for switching the circuit operation between a state of provision of a relatively high voltage and a state of provision of a relatively low voltage, the second state configuring the rectifying circuit in halfwave operation.
    Type: Application
    Filed: July 13, 2005
    Publication date: January 19, 2006
    Applicant: STMicroelectronics, S.A.
    Inventor: Luc Wuidart
  • Adaptation of the transmission power of an electromagnetic transponder reader
    Patent number: 6960985
    Abstract: A terminal for generating an electromagnetic field adapted to cooperating with at least one transponder when the latter enters its field and including an oscillating circuit adapted to receiving a high-frequency A.C. excitation voltage, circuitry for regulating the signal phase in the oscillating circuit with respect to a reference value, circuitry for determining an instantaneous information relative to the magnetic coupling between the transponder and the terminal, and circuitry for adapting the electromagnetic field power according to at least said present information.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: November 1, 2005
    Assignee: STMicroelectronics S.A.
    Inventor: Luc Wuidart
  • Irreversible reduction of the value of a polycrystalline silicon resistor
    Publication number: 20050173779
    Abstract: The invention relates to a method and device for the irreversible reduction of the value of an integrated polycrystalline silicon resistor. The inventive method consists in temporarily subjecting the resistor to a stress current which is greater than a current (Im) for which the value of the resistor is maximum.
    Type: Application
    Filed: February 11, 2003
    Publication date: August 11, 2005
    Inventors: Luc Wuidart, Alexandre Malherbe, Michel Bardouillet
  • Detection of a variation in the environment of an integrated circuit
    Patent number: 6927580
    Abstract: A method and a circuit for detecting variations of at least one environmental parameter of an integrated circuit, including evaluating a propagation delay of an edge in delay elements sensitive to variations of the environmental parameter, and comparing the present or measured delay with at least one reference value.
    Type: Grant
    Filed: September 4, 2002
    Date of Patent: August 9, 2005
    Assignee: STMicroelectronics S.A.
    Inventors: Sylvie Wuidart, Luc Wuidart, Michel Bardouillet, Pierre Balthazar
  • One-time programmable memory cell
    Publication number: 20050162892
    Abstract: The invention relates to a memory cell with a binary value consisting of two parallel branches. Each of said branches comprises: at least one polycrystalline silicon programming resistor (Rp1, Rp2), which is connected between a first supply terminal (1) and a point or terminal for the differential reading (4, 6) of the memory cell state; and at least one first switch (MNP1, MNP2) which, during programming, connects one of said read terminals to a second supply terminal (2).
    Type: Application
    Filed: February 11, 2003
    Publication date: July 28, 2005
    Inventors: Michel Bardouillet, Pierre Rizzo, Alexandre Malherbe, Luc Wuidart
  • Memory cell with non-destructive one-time programming
    Publication number: 20050122759
    Abstract: The invention relates to a one-time programmable memory cell and the programming method thereof. Thc invention comprises a programming transistor (MN) which is disposed in series with a polycrystalline silicon programming resistor (Rp) forming the memory element. According to the invention, the programming is non destructive with respect to the polycrystalline silicon resistor.
    Type: Application
    Filed: February 11, 2003
    Publication date: June 9, 2005
    Inventors: Luc Wuidart, Michel Bardouillet, Alexandre Malherbe
  • Monotonic up-counter in an integrated circuit
    Patent number: 6882699
    Abstract: An increasing monotonic counter over n bits formed as an integrated circuit, including an assembly of 2n+1?(n+2) irreversible counting cells distributed in at least n groups of 2p?1 counting cells, where p designates the group rank, and at least n?1 parity calculators, each calculator providing a bit of rank p, increasing from the most significant bit of the result count, taking into account the states of the cells of the group of same rank.
    Type: Grant
    Filed: October 27, 2003
    Date of Patent: April 19, 2005
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Claude Anguille
  • Evaluation of the number of electromagnetic transponders in the field of a reader
    Patent number: 6879246
    Abstract: A terminal for generating a high-frequency electromagnetic field by an oscillating circuit, adapted to cooperating with at least one transponder when the transponder enters this field, and a method for establishing a communication between the devices, including circuitry for regulating the signal phase in the oscillating circuit with respect to a reference value and circuitry for evaluating, based on a measurement of the current in the oscillating circuit, the minimum number of transponders present in the field.
    Type: Grant
    Filed: May 11, 2001
    Date of Patent: April 12, 2005
    Assignee: STMicroelectronics S.A.
    Inventor: Luc Wuidart
  • Extraction of a binary code based on physical parameters of an integrated circuit
    Patent number: 6836430
    Abstract: An extraction method and an integrated cell for extracting a binary value based on a propagation of an edge of a triggering signal in two electric paths, including across two voltage supply terminals: two parallel branches each including, in series, a resistor for differentiating the electric paths; a read transistor, the junction point of the resistor and of the read transistor of each branch defining an output terminal of the cell, and the gate of the read transistor of each branch being connected to the output terminal of the other branch; and a selection transistor.
    Type: Grant
    Filed: February 11, 2003
    Date of Patent: December 28, 2004
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Michel Bardouillet, Alexandre Malherbe
  • Authentication protocol with memory integrity verification
    Publication number: 20040225889
    Abstract: The invention relates to a method of supplying a private quantity (s) in an integrated circuit involved in an authentication procedure by means of an external device that takes said private quantity into account. In order to verify the integrity of said memory element, the private quantity is a function of a signature (SIGN) of at least one memory element (4, 10, 11, 12) associated with the integrated circuit.
    Type: Application
    Filed: March 10, 2004
    Publication date: November 11, 2004
    Inventors: Luc Wuidart, Pierre Balthazar
  • Duplex transmission in an electromagnetic transponder system
    Patent number: 6784785
    Abstract: A method of transmission between two elements chosen from a terminal and a transponder, each element including an oscillating circuit, a modulator and a demodulator, including simultaneously performing a transmission in amplitude modulation of a signal transmitted from a first to a second element and a transmission of a signal from the second to the first element adapted to being submitted to a phase demodulation in the latter, and wherein the amplitude modulation rate is smaller than 100%.
    Type: Grant
    Filed: April 5, 2000
    Date of Patent: August 31, 2004
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Michel Bardouillet, Jean-Pierre Enguent
  • Chip differentiation at the level of a reticle
    Patent number: 6780716
    Abstract: A method for differentiating integrated circuits implementing identical functions by storage of a binary code in a non-volatile storage element provided in each circuit, including providing, for each circuit of a same reticle, a selective implantation of dopants of its storage element which is different from the selective implantations of dopants of the storage elements of the other circuits.
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: August 24, 2004
    Assignee: STMicroelectronics S.A.
    Inventors: Luc Wuidart, Guilhem Bouton, Michel Bardouillet
  • Three-state memory cell
    Publication number: 20040136238
    Abstract: A memory cell with at least two detectable states among which is an unprogrammed state, comprising, in series between two terminals of application of a read voltage, at least one first branch comprising: a pre-read stage comprising, in parallel, two switchable resistors having different values with a first predetermined difference; and a programming stage formed of a polysilicon programming resistor, a terminal of the programming resistor being accessible by a programming circuit capable of causing an irreversible decrease in its value.
    Type: Application
    Filed: October 30, 2003
    Publication date: July 15, 2004
    Applicant: STMicroelectronics S.A.
    Inventors: Sylvie Wuidart, Luc Wuidart