System for converting charge into voltage and method for controlling this system

A system for converting charge comprising:

• a device for converting charge into voltage comprising an amplifier and at least one capacitor mounted in inverse feedback between an input and an output of said amplifier, whereby said amplifier can be connected between at least one input stage, to receive at least one charge therefrom, and at least one output stage to deliver voltage thereto, said voltage being representative of the charge received;
• a first controllable element capable of disconnecting the amplifier from the input stage;
• and
• a control device capable of controlling the first controllable element according to a first phase of conversion of a charge received from the input stage by the amplifier,
• wherein it further comprises a second controllable element capable of disconnecting the amplifier from the output stage, the control device being capable, during the conversion phase, at least of:
• controlling the first element in order to connect the amplifier to the input stage, and controlling the second element in order to disconnect the amplifier from the output stage;
• and then,
• controlling the first element in order to disconnect the amplifier from the input stage and controlling the second element in order to connect the amplifier to the output stage, and
• wherein the at least one input stage includes a column of a matrix of detection elements, whereby the charge conversion device can be connected to each of the detection elements of said column to receive a charge therefrom.