Patent ID: 8217641
Filing Date: 2012-07-10
Classification: G01J,H04N

Abstract:
1. A device for reading electric currents received on an input branch coming from elementary sensors of a matrix device for detecting electromagnetic radiation, comprising a capacitive element that integrates the currents, the terminals of said capacitive element being connected to a mass and to an output branch of said device respectively, wherein said device further comprises a differential pair consisting of: a first transistor mounted between the input branch and the capacitive element, said first transistor being controlled by a polarized impulse voltage capable of putting said first transistor alternately into the off state and then into the on state, wherein when said first transistor is in the on state, said first transistor sets the potential of the input branch to a constant value and supplies the capacitive element with the currents for reading; a second transistor mounted between the input branch and a potential other than that of the capacitive element, said second transistor also being controlled by a polarized impulse voltage capable of putting said second transistor alternately into the off state and then into the on state, wherein when said second transistor is in the on state, said second transistor keeps the input branch at a constant potential in time other than that of the capacitive element and drains the charges received on the input branch elsewhere than into the capacitive element, wherein said second transistor is controlled in phase opposition relative to the first transistor, the second transistor being in the on state every time the first transistor is in the off state, and the second transistor being in the off state every time the first transistor is in the on state.