Patent application number | Description | Published |
20080243973 | Locking of an Integrated Circuit - A method for protecting an integrated circuit. According to the method, the start-up of all, or part, of the circuit is determined in the presence of a key which is recorded in a non-volatile manner in the circuit, following the production thereof, and depends on at least one first parameter which is present in a non-volatile manner in the circuit after the production thereof. | 10-02-2008 |
20090273452 | RECHARGE OF AN ACTIVE TRANSPONDER - A method for configuring a terminal capable of emitting a radio-frequency field for a transponder including, in the presence of a transponder within the range of the terminal, at least one step of adaptation of the series resistance of an oscillating circuit of the terminal, according to an off-load value, which depends on an operation of the terminal while no transponder is in its field. | 11-05-2009 |
20090323381 | ADAPTABLE POWER SUPPLY CIRCUIT - 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. | 12-31-2009 |
20100039337 | ELECTROMAGNETIC FIELD GENERATION ANTENNA FOR A TRANSPONDER - An antenna generating an electromagnetic field for an electromagnetic transponder and a terminal provided with such an antenna. The antenna comprises a first inductive element designed to be connected to two terminals employing an energizing voltage, and a parallel resonant circuit coupled with the first inductive element. | 02-18-2010 |
20100097843 | EXTRACTION OF A BINARY CODE BASED ON PHYSICAL PARAMETERS OF AN INTEGRATED CIRCUIT - An integrated cell and method for extracting a binary value based on a value difference between two resistors values, including connection circuitry for a binary reading of the sign of the difference between the resistors, and connection circuitry for a modification of the value of one of the resistors to make the sign of the difference invariable. | 04-22-2010 |
20100321164 | INDUCTIVE EVALUATION OF THE COUPLING FACTOR OF AN ELECTROMAGNETIC TRANSPONDER - A method for evaluating the current coupling factor between an electromagnetic transponder and a terminal, wherein a ratio between data representative of a voltage across an oscillating circuit of the transponder and obtained for two pairs of inductive and capacitive values of this oscillating circuit is compared with one or several thresholds, the two pairs of values preserving a tuning of the oscillating circuit to a same frequency. | 12-23-2010 |
20100323629 | RESISTIVE EVALUATION OF THE COUPLING FACTOR OF AN ELECTROMAGNETIC TRANSPONDER - A method for evaluating the current coupling factor between an electromagnetic transponder and a terminal, wherein a ratio between data, representative of a voltage across an oscillating circuit of the transponder and obtained for two values of the resistive load, is compared with one or several thresholds. | 12-23-2010 |
20100328026 | AUTHENTICATION OF AN ELECTROMAGNETIC TERMINAL-TRANSPONDER COUPLE BY THE TRANSPONDER - A method of authentication of a terminal generating a magnetic field, by a transponder including an oscillating circuit from which a D.C. voltage is generated, wherein the transponder: receives first data relative to the current in an oscillating circuit of the terminal, measured by the terminal for a first value of the resistive load of the transponder; and exploits these first data and second data relative to the level of said D.C. voltage, respectively measured for the first resistive load value and for a second resistive load value. | 12-30-2010 |
20100328027 | AUTHENTICATION OF AN ELECTROMAGNETIC TERMINAL-TRANSPONDER COUPLE BY THE TERMINAL - A method of authentication, by a terminal generating a magnetic field, of a transponder located in this field, wherein: first data, relative to the current in an oscillating circuit of the terminal, measured by the terminal for a first value of the resistive load of the transponder, are transmitted to the transponder; second corresponding data are evaluated by the transponder for a second value of the resistive load and are transmitted to the terminal; and said second data are compared with third corresponding data, measured by the terminal for the second value of the resistive load. | 12-30-2010 |
20100328046 | AUTHENTICATION OF A TERMINAL BY AN ELECTROMAGNETIC TRANSPONDER - A method of authentication of a terminal generating a magnetic field by a transponder including an oscillating circuit from which a D.C. voltage is generated, wherein at least one quantity depending on the coupling between the transponder and the terminal is compared with at least one reference value. | 12-30-2010 |
20110095769 | DETECTION OF A DISTANCE VARIATION WITH RESPECT TO A ROTATION AXIS - A method of detection of a distance variation with respect to an axis of at least one point of an object rotating around this axis by a terminal at a fixed position with respect to the axis and capable of emitting a radiofrequency field for at least one resonant circuit attached to the object. The method includes the steps of measuring and recording, on the terminal side, a maximum value of a quantity representative of the coupling between an oscillating circuit of the terminal and the at least one resonant circuit; and detecting a variation of this periodic maximum. | 04-28-2011 |
20110140852 | POWER MANAGEMENT IN AN ELECTROMAGNETIC TRANSPONDER - A method of evaluation, by an electromagnetic transponder in the field of a terminal generating a magnetic field, of power that can be extracted from this field, including the steps of: evaluating the current coupling between the transponder and the terminal; and deducing therefrom information relative to the power available in this coupling position. | 06-16-2011 |
20110300800 | EVALUATION OF THE COUPLING FACTOR OF AN ELECTROMAGNETIC TRANSPONDER BY CAPACITIVE DETUNING - A method for evaluating the current coupling factor between an electromagnetic transponder and a terminal, and a transponder implementing this method, wherein a ratio between data representative of a voltage across an oscillating circuit of the transponder and obtained for two capacitance values of the oscillating circuit is compared with one or several thresholds. | 12-08-2011 |
20120092901 | POWER MANAGEMENT IN AN ELECTROMAGNETIC TRANSPONDER - A method for managing the power in an electromagnetic transponder in the field of a terminal, including the steps of: evaluating the power consumption of the transponder circuits; and if this power consumption is below a threshold, evaluating the current coupling factor between the transponder and the terminal and, according to the current coupling: causing an increase of the transponder power consumption or causing a detuning of an oscillating circuit of the transponder. | 04-19-2012 |
20120105012 | POWER RECOVERY BY AN ELECTROMAGNETIC TRANSPONDER - A method of power recovery by an electromagnetic transponder in the field of a terminal, wherein: a ratio of the current coupling factor of the transponder with the terminal to an optimum coupling position with a resistive load value is evaluated; and a detuning of the oscillating circuit is caused if the ratio is greater than a first threshold greater than or equal to one. | 05-03-2012 |
20120149335 | CONTACTLESS COMMUNICATION WITH AUTHORIZATION BY HUMAN CONTACT AND VISUAL INDICATOR - Transponder comprising a resonant circuit, comprising an antenna and a capacitor, and at least one memory, wherein it comprises at least one contact zone for receiving a portion of human body, so that the positioning of a portion of human body on a contact zone modifies the electric circuit of the transponder, capable of switching from a first state in which it does not allow the memory to be read and/or written to a second state in which it allows the memory to be read and/or written when the resonant circuit of the transponder is contactlessly powered by a reader and in that it comprises an indicator which makes it possible to indicate that the positioning of a portion of human body on the contact zone of the transponder is or has been recognized. | 06-14-2012 |
20120149443 | CONTACTLESS COMMUNICATION WITH AUTHORIZATION BY HUMAN CONTACT - A transponder comprising a resonant circuit, comprising an antenna and a capacitor, and at least one memory connected to the resonant circuit via an intermediate circuit, characterized in that the intermediate circuit comprises at least one contact zone for receiving a portion of human body, so that the positioning of a portion of human body on a contact zone modifies the intermediate circuit, capable of switching from a first state in which it does not allow the memory to be read and/or written to a second state in which it allows the memory to be read and/or written when the resonant circuit of the transponder is contactlessly powered by a reader. | 06-14-2012 |
20120189146 | CONTACTLESS RECHARGING OF THE BATTERY OF A PORTABLE OBJECT BY A TELEPHONE - A method for charging the battery of a portable object by a telephone, comprising a step for contactless transmission of power from a charging device of the telephone to the portable object, inducing the charging of the battery of the portable object. | 07-26-2012 |
20120190305 | BATTERY LEVEL INDICATION BY PORTABLE TELEPHONE - Methods for indicating the state of charge of the battery of a portable object, comprising a step for contactless transmission from a portable object to a telephone of the state of charge of the battery of the portable object, and a step for indication, via a human-machine interface of the telephone, of the state of charge of the battery of the portable object. | 07-26-2012 |
20120250429 | SECURITY-PROTECTION OF A WAFER OF ELECTRONIC CIRCUITS - A process is provided for fabricating a wafer including a plurality of chips separated by scribe lines. The method includes locking at least one chip on the wafer using a secret key, and writing the secret key into at least one memory present on the wafer. | 10-04-2012 |
20130080810 | OPTIMIZATION OF THE PROCESSING SPEED OF AN ELECTROMAGNETIC TRANSPONDER - A method for setting the clock frequency of a processing unit of an electromagnetic transponder, wherein a ratio between data, representative of a voltage across an oscillating circuit of the transponder and obtained for two values of the resistive load, is compared with one to decide whether to increase or decrease the clock frequency of the processing unit. | 03-28-2013 |
20130257587 | AUTHENTICATION OF A TERMINAL BY AN ELECTROMAGNETIC TRANSPONDER - A method of authentication of a terminal generating a magnetic field by a transponder including an oscillating circuit from which a D.C. voltage is generated, wherein at least one quantity depending on the coupling between the transponder and the terminal is compared with at least one reference value. | 10-03-2013 |
20140113554 | ASSISTANCE FOR POSITIONING A TRANSPONDER - A method for assisting with positioning of an electromagnetic transponder by a user with respect to a terminal, wherein: a first value of the current in an oscillating circuit of the terminal is periodically measured; a second value of a ratio between a no-load value of this current, stored when no transponder is in the field of the terminal, and the first value, is calculated; and pieces of information intended for the user are controlled according to said second value. | 04-24-2014 |
20140113555 | PROTECTION OF COMMUNICATION BY AN ELECTROMAGNETIC TRANSPONDER - A method for protecting communication between an electromagnetic transponder and a terminal, wherein the transmission of an acknowledgement for a request received from a terminal by the transponder is only allowed when the transponder is in mechanical contact or in quasi-mechanical contact with the terminal. | 04-24-2014 |
20140113692 | TRANSPONDER POSITIONING AID - A method for assisting with positioning of an electromagnetic transponder by a user with respect to a terminal, wherein: a current value of a ratio of the current coupling factor between the transponder and the terminal to an optimum coupling factor with a first resistive load value is calculated and stored; the current value is compared with a previous value of this ratio, stored in a previous iteration; and data elements intended for the user are controlled according to the comparison. | 04-24-2014 |
20140118115 | PROTECTION OF COMMUNICATION BETWEEN AN ELECTROMAGNETIC TRANSPONDER AND A TERMINAL - A method for protecting communication between an electromagnetic transponder and a terminal, wherein the transmission of a polling request by the terminal is only allowed when the transponder is in mechanical contact or in quasi-mechanical contact with the terminal. | 05-01-2014 |