Abstract: A method for connecting an electronic chip (10) to contacts (47and 48) of an electric circuit, the chip having two conductive plates (31and 32) located on the last layer of the chip and at least one electromagnetic shielding layer, at least one of the plates (31or 32) being entirely covered with an electrical insulating layer (34). The method includes placing an adhesive dielectric material (40) on the circuit between the contacts (47, 48), to fix the electronic chip (10) relative to the circuit, positioning electronic chip (10) on the circuit so that conductive plates (31et 32) are opposite the contacts (47and 48), so as to create between the chip and the electric circuit at least one capacitive link made up of the conductive plate (31or 32), the electrically insulating layer and the contact (47or 48).

Abstract: The invention concerns a method for connecting an electronic chip (10) to contacts (47 and 48) of an electric circuit and designed to receive the chip, the chip being provided with two conductive plates (31 and 32) located on the last layer making up the chip and at least one electromagnetic shielding layer, at least one of the plates (31 or 32) being entirely covered with an electrically insulating layer (34), the method including the following steps: Placing an adhesive dielectric material (40) on the circuit between the contacts (47, 48), so as to maintain the electronic chip (10) in a fixed position relative to the circuit, Positioning the electronic chip (10) on the circuit so that the conductive plates (31 et 32) are opposite the contacts (47 and 48) of the electric circuit, so as to create between the chip and the electric circuit at least one capacitive link made up of the conductive plate (31 or 32), the electrically insulating layer completely covering said plate and the contact (47 or 48).

Abstract: A contactless reading system, wherein a chip card is fixed on a planar support of an object such as a book (11) for identification by means of the data contained in the chip card, and a mobile reader (16) provided with an antenna in order to read the data of the card. The antenna of the reader (16) consists of a small-sized convolution disposed in a series with a large-sized convolution, which are concentric and which have the same winding direction. A maximum value is obtained for the component (H) of the electromagnetic field produced by the antenna parallel to the antenna at a given distance from the antenna. Maximum reception by the chip card of electromagnetic signals emitted by the antenna is obtained when the antenna is disposed in a perpendicular position in relation to the support of the card and at the given distance from the card.

Abstract: A contactless reading system, wherein a chip card is fixed on a planar support of an object such as a book (11) for identification by means of the data contained in the chip card, and a mobile reader (16) provided with an antenna in order to read the data of the card. The antenna of the reader (16) consists of a small-sized convolution disposed in a series with a large-sized convolution, which are concentric and which have the same winding direction. A maximum value is obtained for the component (H) of the electromagnetic field produced by the antenna parallel to the antenna at a given distance from the antenna. Maximum reception by the chip card of electromagnetic signals emitted by the antenna is obtained when the antenna is disposed in a perpendicular position in relation to the support of the card and at the given distance from the card.

Abstract: An anti-collision process for elements controlled by a host computer allowing the identification of elements by the latter, each of the elements having an identification number between 0 and a maximum value (MAX), and including transmission by the host computer of a query instruction able to be received and recognized by all elements, transmission by the host computer of an anti-collision instruction including an identification attempt digital value, response by any element having an identification number less than or equal to the digital identification attempt value, and detection of a collision between several elements when the host computer receives several responses and transmissions of a new anti-collision instruction according to a given algorithm, or selection of the element by its identification number when there is only one response.

Abstract: Method for modifying data in a card transaction system including a smart card and a reader capable of reading the card, the card including a non-volatile, erasable and rewritable memory having at least one location to record a data value relating to card transactions. Each transaction results in modification of the data value, the latter being a monotonic function in time. At each transaction, a data value writing operation performs the writing of the new data value (Y) in a first location (B) of two predefined locations in the memory forming a counter, the writing operation erasing the old data value recorded in the second location (A) such that, at the end of the correctly performed writing operation, the first location contains the new data value whilst the second location contains the value zero.

Abstract: The present invention relates to a pipeline microprocessor (MP) comprising a first pipeline stage (ST1) comprising means IPC, MMU, PC, B2, DEC1) for reading and decoding instructions (CODEOP, ADRs, ADRd) of a program recorded in a memory (MEM), and a second pipeline stage (ST2), contiguous to the first pipeline stage, comprising two sectors (ST21, ST22) activated one after the other during complementary half-cycles of a clock signal (H1) of the microprocessor. The first sector reads data contained in two registers (Rd, Rs) of a bank of registers (BANK1, BANK2) of the microprocessor and carries out an operation on the data according to an instruction (CODEOP, ADRs, ADRd) received at the previous clock cycle. The second sector (ST22) comprises means (B4, DEC1) to record the result of the operation in a register of the bank of registers (BANK1, BANK2). Application especially to chip cards.

Abstract: A contactless portable object (10) featuring a main chip (12) and an antenna (14) enabling electromagnetic signals to be communicated between the chip and a reader associated to the contactless portable object, the antenna terminals being connected to the terminals of the main chip. The contactless portable object features at least one contactless peripheral device (16, 18), having a function different from the main chip, also connected in parallel to the antenna's terminals and whose energy required to operate is supplied by the antenna.

Abstract: An integrated circuit with contactless functioning including devices for modulating the load of the an antenna coil, extracting a clock signal, and delivering a pulsed load modulating signal comprising a series of load modulating pulses with duration asynchronously calibrated by the charge or discharge of a capacitor and for inhibiting the clock extraction device at least while load modulating pulses are being emitted. The invention permits the reduction of the integrated circuit power consumption during data transmission intervals.