Abstract:
An electronic read circuit for a radiation detector comprises: a comparator receiving a threshold potential and the potential from an integration node, said node being able to store electrical charges that are generated by a photosensitive element; a counter connected to the output of the comparator; and a counter-charge injection circuit comprising: a capacitor that stores counter-charges, a transfer transistor that can be turned on in order to transfer counter-charges from a terminal of the capacitor to the integration node whenever the comparator toggles, the transfer of the counter-charges bringing about a variation of potential at said terminal of the capacitor, and a regulation circuit for controlling the transfer transistor, said circuit comprising means for turning on the transfer transistor when the potential of the terminal of the capacitor is between two predetermined potentials that are independent of the transfer transistor.
Abstract:
A matrix microelectronic device includes elementary cells laid out according to a matrix. Each cell has a current source formed by a current source transistor. A source electrode of the transistor is connected to a source biasing conductor line of a plurality of source biasing conductor lines. A gate electrode of the transistor is connected to a gate biasing conductor line of a plurality of gate biasing conductor lines. A biasing device biases the gate biasing conductor lines and includes at least one first connection line that is connected to at least several of the gate biasing conductor lines. The biasing device includes a voltage generator or a current generator that causes a variation of potentials along the first connection line, thereby compensating a corresponding variation of potentials along the source biasing conductor lines. The device can include an addressing circuit for addressing horizontal lines or rows of the matrix.
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:
An analog/digital converter device associated with a detector of an image sensor, including: a comparator capable of receiving the analog signal and delivering a two-states output signal, able to adopt, depending on the analog signal, a first stable state or a second state, a charge injector capable of changing the analog signal by injection of at least one quantity of charges into the capacitor, and a mechanism for commanding the charge injector, capable of receiving the two-state signals and capable of triggering, depending on the two-state signals, plural injections of charges between at least two successive changes in state of the signal, from the first state to the second state and from the second state to the first state.
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:
An electronic read circuit for a radiation detector comprises: a comparator receiving a threshold potential and the potential from an integration node, said node being able to store electrical charges that are generated by a photosensitive element; a counter connected to the output of the comparator; and a counter-charge injection circuit comprising: a capacitor that stores counter-charges, a transfer transistor that can be turned on in order to transfer counter-charges from a terminal of the capacitor to the integration node whenever the comparator toggles, the transfer of the counter-charges bringing about a variation of potential at said terminal of the capacitor, and a regulation circuit for controlling the transfer transistor, said circuit comprising means for turning on the transfer transistor when the potential of the terminal of the capacitor is between two predetermined potentials that are independent of the transfer transistor.
Abstract:
Enhancement of the reliability of an imaging device comprising several pixels is provided, each of the pixels comprising several first blocks of electronic components organized as a matrix and joined by links to row buses and column buses of the matrix allowing the powering and control of each of the first blocks for its nominal operation. Each of the pixels moreover comprises, associated with the first block, programmable means for disconnection of the first block from the at least one of the buses. Locating of a fault in a device is also provided, the fault occurring in one of the first blocks and leading to a generalized fault in several first blocks.
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:
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:
According to the invention, each light-sensitive element is made up by the series-connection of a capacitor, a photodiode and an electronic switch. The light signal to be read is applied to the device after the photodiodes have been reverse polarized by a voltage pulse with an amplitude V.sub.P1. The device is read row by row, by the application of a voltage pulse with an amplitude V.sub.P2 greater than V.sub.P1 to each row read. The switches of the read row are closed while the switches of the other rows are open. Once the device is read, the photodiodes are zeroized.