Abstract:
PROBLEM TO BE SOLVED: To provide a protection circuit occupying a small area in an integrated circuit for protecting the integrated circuit against electrostatic discharges and overvoltages. SOLUTION: The integrated circuit comprises at least one element of an electronic protection circuit having at least one switch for short-circuiting supply conductors formed on a rail, wherein the switch is integrated in the rail under the conductors. COPYRIGHT: (C)2003,JPO
Abstract:
PROBLEM TO BE SOLVED: To decode an incident pulse signal of the ultra wideband type through digital processing. SOLUTION: The incident pulse signal of the ultra wideband type conveys digital information encoded by using pulses in a known theoretical shape. A decoding device is equipped with an input means which receives the incident signal and sends a base signal out, a preprocessing means which is so adapted as to receive the base signal and sends out an intermediate signal representing the code of the base signal with respect to a reference, a means which samples an intermediate ISN signal and sends a digital signal out, a synchronizing means, a decoding means, and a digital processing means which is so adapted as to correlate the digital signal with a reference correlation signal corresponding to a theoretical base signal arising from the reception of the theoretical pulses having the known theoretical shape.
Abstract:
PROBLEM TO BE SOLVED: To provide an integrated circuit equipped with an internal clock having no such defect that an oscillating frequency fluctuates in dependence on a power supply voltage of a circuit or variation in manufacturing. SOLUTION: In this integrated circuit, a processor (CPU) and an oscillator (OSC) are integrated in the same substrate, and a data resistor (R1) which can be loaded by the processor is provided. The oscillator functions as a clock for the processor, and is a relaxation oscillator equipped with a capacitor (C) and a current source for charge and discharge of the capacitor. The data resistor controls frequency adjustment of the relaxation oscillator by controlling the value of the charge and discharge current of the capacitor, and is loaded by the processor from an electrically programmable and nonvolatile memory (M1) provided in the same substrate of the integrated circuit while storing frequency correction data.
Abstract:
PROBLEM TO BE SOLVED: To provide an integrated semiconductor memory device having hybrid performance. SOLUTION: The integrated semiconductor memory device is provided with an integrated memory structure CH2 provided with a semiconductor layer surrounded by an isolation layer, lying between the source region S and the drain region D of a transistor and inserted between the channel region of the transistor and its control gate. The semiconductor layer included two potential well zones Z1 and Z3 separated by a potential barrier zone Z2 lying beneath the control gate of the transistor. Write means Vg and Vds bias the memory structure so as to confine charge carriers selectively in one or other of the two potential well zones, and read means Vg and Vd bias the memory structure so as to detect, for example by measuring the drain current of the transistor, the presence of charge carriers in one or other of the potential wells.
Abstract:
PROBLEM TO BE SOLVED: To prevent a read error caused by variation of a property of a reference memory cell. SOLUTION: This method is a method for refreshing a reference memory cell (Cref) in a non-volatile memory. This method has a step in which the reference cell (Cref) and a test cell (Cveri) are simultaneously selected during read, read signals are compared when a signal read by the reference cell is smaller than a signal read by the test cell, and refresh signals (Sr1, Sr2, Sr3) are outputted to the reference cell (Cref). This method is applied to an electronic memory of a non-volatile type.
Abstract:
PROBLEM TO BE SOLVED: To manufacture a single crystal substrate allowing a silicon epitaxial layer having no crystal defect to be formed thereafter. SOLUTION: The manufacturing method comprises a step of forming an initial single crystal substrate having at least one crystal lattice discontinuity locally on the surface, recessing the discontinuous spot of the initial substrate, making a crystal lattice around the recess amorphous, depositing a layer of an amorphous material having the same chemical composition as the initial substrate on an obtained structure, and thermally annealing the obtained structure to re-crystallize the amorphous portions so as to continue the single crystal lattice of the initial substrate.
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.
Abstract:
PROBLEM TO BE SOLVED: To provide a demodulator for non-contact chip card, which is not affected by the level of a received signal. SOLUTION: A non-contact chip card where binary data is transmitted by a radio frequency includes a demodulator for binary data. The demodulator includes a circuit for detecting a transmitted signal, a rectifying circuit, a band pass filter, a comparator stage and a memory circuit. The band pass filter gives a low frequency signal used as a reference for two comparators and a high frequency signal supplied for comparison with the reference which changes with the low frequency signal. Consequently, demodulation is not affected by the average level of the received signal.
Abstract:
PROBLEM TO BE SOLVED: To prevent a data element moving via a bus from being identified or to hardly make the data element identified. SOLUTION: In the electronic component provided with a 2-way bus DATA- BUS through which the data element is moved at a speed of a clock signal PHI between peripheral devices P1, P2, P3 and a central processing unit CPU, each of the central processing unit CPU and at least one peripheral device P1 is provided with a data encryption/decoding cell Kcell employing respectively the same private key KEY, a random signal Kin synchronously with the clock signal PHI is uniquely outputted at each clock cycle of each cell as the current value of the private key and applied to the respective cells through a unidirectional transmission line.
Abstract:
PROBLEM TO BE SOLVED: To avoid increase of resistivity of a metallic track caused by silicon diffusion to copper. SOLUTION: This process comprises a step for generating at least one metallic track 7 in an inside of a track insulation material 1 at a predetermined metallization level. The generation step of the metallization track 7 comprises an etching step of the track insulation material 1 forming a clearance 4 in the position of the track, a step for depositing a conduction barrier layer 5 in the clearance, a step for filling the clearance with copper, and a step for depositing a silicon nitride layer 8 on the predetermined metallization level. Titanium is deposited in at least a barrier layer between a deposition step of a barrier layer and a filling step of copper. The titanium changes to TiSi2 (60) during silicon diffusion from the silicon nitride layer 8.