Abstract: A matrix microelectronic device comprising: a plurality of cells laid out according to a matrix, respectively comprising at least one current source formed by at least one current source transistor (T1), a source electrode of said transistor is connected to a source biasing conductor line, a gate electrode of the transistor is connected to a gate biasing conductor line among a plurality of conductor gate biasing lines, wherein the device further comprises means for biasing the conductor gate biasing lines comprising: at least one first connection line, means for generating current or voltage, positioned on at least one end of said first connection line, and provided to generate an evolution of potentials along said first connection line.

Abstract: A matrix microelectronic device comprising: a plurality of cells arranged according to a matrix, one or several conductive lines provided to carry a given potential and to which respectively one or several cells of a row of cells of the matrix are linked, a plurality of voltage regulating elements, wherein said regulating elements are connected respectively between a cell of said plurality of cells and one of said conductive lines, said given potential serving as polarisation potential of said regulating elements, wherein said regulating elements are respectively provided to apply to said given cell a regulated polarisation potential.

Abstract: The invention relates to detectors for radiological imaging, and more particularly the X-ray matrix detectors, produced in the form of a CMOS technology pixel matrix, associated with a structure for converting X-rays into electrons. Each pixel comprises a reading circuit comprising on the one hand a comparator (COMP1) switching over each time a charge increment arrives resulting from the integration of a charge current generated by the lighting and on the other hand a counting circuit (CPT1, CPT2) for counting the number of switchovers of the comparator. The circuit for reading each pixel comprises a circuit (CMC) for analyzing the rate of the switchovers of the comparator, this analysis circuit acting on the counting circuit to modify its operation according to the result of the rate analysis. For example, the analysis circuit switches the counting pulses to one counter (CPT1) or another counter (CPT2) depending on the result of the analysis.

Abstract: A low consumption voltage amplifier including a transistor, a first current generator that supplies power to the drain of the transistor, a second current generator that charges the source of the transistor, the current output by the second current generator being substantially equal to the value of the current output by the first current generator, a first capacitor connected to the drain of the transistor, and a second capacitor connected to the source of the transistor. An additional field effect transistor of the type opposite to the type of the first field effect transistor is inserted between the current generator and the first field effect transistor.

Abstract: Devices and methods for processing a signal emitted by a particle detector in which the methods include detecting in the signal the portions where the signal is greater than a predetermined value V1, measuring the maximum value Vmax reached by the signal in each of the portions, and associating with each of the portions an analog quantity Q which, at least in a predetermined range of values DELTA V1 of the maximum value Vmax, is an increasing function of (Vmax?V1).

Abstract: A low consumption voltage amplifier including a transistor, a first current generator that supplies power to the drain of the transistor, a second current generator that charges the source of the transistor, the current output by the second current generator being substantially equal to the value of the current output by the first current generator, a first capacitor connected to the drain of the transistor, and a second capacitor connected to the source of the transistor. An additional field effect transistor of the type opposite to the type of the first field effect transistor is inserted between the current generator and the first field effect transistor.

Abstract: This invention relates to a particle detector comprising means (1, 2, 3) of delivering electrical pulses and means (4) of counting delivered electrical pulses. The detector comprises means capable of receiving and transmitting electrical pulses originating from at least one second particle detector to the counting means (4) and means capable of transmitting electrical pulses that it delivers and electrical pulses that it receives from the said second particle detector to the counting means of a third particle detector. The invention is particularly applicable to radiology (X-ray, radioscopy).

Abstract: The assembly formed by the amplifier 34, the transistor 36 and the capacitor 28 fulfills the function of the amplifier 8 and the impedance 10 of the device shown in FIG. 4.

Abstract: The invention concerns methods for processing a signal emitted by a particle detector. Said methods are characterised in that they consist in: detecting in said signal the portions where the signal is greater than a predetemined value V1, measuring the maximum value Vmax reached by the signal in each of said portions, and associating with each of said portions an analog quantity which, at least in a predetermined range of values &Dgr;V1 of said maximum value Vmax, is an increasing function of (Vmax−V1). The invention is applicable to various devices and appliances implementing said methods.

Abstract: Device for reducing the lag and the dark current of a particle detector, and in particular a photon detector.

Abstract: This invention relates to a particle detector comprising means (1, 2, 3) of delivering electrical pulses and means (4) of counting delivered electrical pulses.

Abstract: This invention relates to a particle detector comprising counting means (4).

Abstract: Device for discrimination of electrical pulses output from at least one semiconductor radiation detector, comprising: at least one means (106a, 106b) of transforming pulses capable of increasing a value of a derivative of the pulse with respect to at least one parameter called the slope parameter, at least one integrator (108a, 108b) capable of establishing a “characterization” value for each transformed pulse, the said value being obtained by integration of the transformed pulse, pulse sort means (110) as a function of their characterization value.

Abstract: The invention relates to a device for detecting ionizing radiations comprising:

Abstract: A device for copying a voltage (Ve) comprises a pair of series-connected MOS transistors, their sources forming a common point. The voltage (Ve) to be copied is applied between the gate of the first MOS transistor of the pair and a reference. Means are provided to inject a flux of electrons at a common point. A storage capacitor has a first terminal connected to the drain of the second MOS transistor and a second terminal designed to be biased. Means dictate a potential at the drain of the second MOS transistor and then let it vary so that the flux of electrons is stored in the storage capacitor while at the same time decreasing in the second MOS transistor to the benefit of the first one. The copied voltage Vs is available, after stabilization, between the first terminal of the storage capacitor and the reference. Application in particular to circuits for the reading of charges generated in a photosensitive matrix or photosensitive linear array.

Abstract: The invention is applicable to matrix detector or display screens formed by assembling several elementary screens. A matrix screen according to the invention comprises several elementary screens (E1 to E4) spliced together on one of their edges (10, 11). According to the invention, each elementary screen (E1 to E4) includes a mechanical stop device (B1 to B4) which mates with a mechanical stop device on an elementary screen to which it is spliced so that the two elementary screens are positioned relative to each other. This arrangement avoids long and difficult alignment and indexing during the assembly of the elementary screens (E1 to E4) since these operations are completed when the elementary screens are cut, this operation itself requiring the use of accurate alignment and indexing tools.

Abstract: In a matrix array of photosensitive elements, each photosensitive point is provided with a photosensitive element (pin photodiode) in series with a capacitor between a row lead and a column lead. It is proposed to make use of a simplified photosensitive element in which an end semiconductor layer is suppressed such as, for example, the n-layer of a pin photodiode or the n-layer of a five-layer phototransistor of the nipin type. The dielectric of the capacitor then comes directly into contact with an intrinsic semiconductor layer in which electrons accumulate. These electrons reconstitute the equivalent of an n-type doped layer.

Abstract: The invention concerns a photosensitive device (1) enabling the formation of the image of a document (10) and the conversion of this image into electrical signals with a view to its reproduction or transmission. To this effect, the photosensitive device (1) has a matrix (2) of photosensitive dots (P1 to P9) connected to an addressing device (46, 42) and a reading device (32). According to one characteristic of the invention, the photosensitive device (1) further has a light emitting optical pencil (15) enabling a photosensitive surface (5) of the matrix (2) to be used as a writing surface to fulfil a graphic tablet function.

Abstract: Each photosensitive dot of the photosensitive matrix disclosed is formed by one capacitor and two diodes. The capacitor is connected between a row conductor and a common floating node. A photodiode is connected between the floating node and a reference voltage source which biases it in reverse. A small-sized reading diode, hence one with low capacitance, is connected between the floating node and a column conductor. This structure enables the making of a matrix having a reduced column capacitance. It therefore enables a more efficient transfer of charges from the photodiodes to the reading circuit connected at the end of a column.

Abstract: The disclosure concerns matrices of photosensitive elements. To avoid the need for a resetting light source using, as a photosensitive dot, a photodiode in series with a capacitor between a row conductor and a column conductor, it is proposed, according to the invention, to provide for a photosensitive dot comprising three diodes (a photosensitive diode, a reading diode and a resetting diode) connected to a common floating node. In one embodiment, the anode of the photosensitive diode is connected to a row-addressing conductor giving a reading pulse to the selected line; the cathode of the reading diode is connected to the column conductor which collects the useful signal; and the anode of the resetting diode is connected to a second row conductor (which, besides, may be the first conductor of a neighbouring row) which receives a resetting pulse after the reading pulse.