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AssigneeCommissariat a l'Energie Atomique
InventorsPhilippe Pantigny, Arnaud LaFlaquire, Frédéric Rothan
Estimating the term…
The invention relates to a circuit for reading charges comprising a capacitive means (C1, C2) with capacitance Ca to store charges and means of reading a voltage sampled at the terminals of the capacitive means. The capacitive means is built up from a first capacitive means (C1) and a second capacitive means (C2) with a capacitance Cb less than Ca. The read circuit comprises means of comparing the voltage read at the terminals of the capacitive means with a threshold value (Vthreshold) and means of controlling the transfer of charges stored in the first capacitive means to the second capacitive means when the voltage read at the terminals of the capacitive means exceeds the threshold value (Vthreshold). The invention is applicable to detection of radiation in the imagery field.
Circuit for reading charges comprising a capacitive means (C1, C2) with capacitance Ca to store charges and means of reading a voltage sampled at the terminals of the capacitive means, characterized in that the capacitive means is built up from a first capacitive means (C1) and a second capacitive means (C2) with a capacitance Cb less than Ca, comprising means (COMP) of comparing the voltage read at the terminals of the capacitive means with a threshold value (Vthreshold), means of controlling the transfer of charges stored in the first capacitive means (C1) to the second capacitive means (C2) with a capacitance Cb less than Ca when the voltage read at the terminals of the capacitive means exceeds the threshold value (Vthreshold) and means of reading a voltage sampled at the terminals of the second capacitive means.
Read circuit according to any one of the previous claims, characterized in that the means of reading a voltage sampled at the terminals of the capacitive means form means of reading a voltage sampled at the terminals of the second capacitive means.
Radiation detector circuit comprising at least one photo detector (D) to convert detected radiation into electric charges and an electric charge reading circuit, characterized in that the electric charge reading circuit is a circuit for reading charges according to any one of the previous claims.
Process for reading charges comprising a step in which charges are integrated in a capacitive means (C1, C2) with capacitance Ca and a step in which the voltage at the terminals of the capacitive means is read, characterized in that the capacitive means is built up from a first capacitive means (C1) and a second capacitive means (C2) with a capacitance Cb less than Ca, the read process comprises a step in which the voltage read at the terminals of the capacitive means is compared with a threshold voltage (Vthreshold), a step in which charges stored in the first capacitive means are transferred to the second capacitive means with a capacitance Cb less than Ca when the voltage read at the terminals of the capacitive means exceeds the threshold value (Vthreshold) and a step in which a voltage at the terminals of the second capacitive means is read.
Dependencies are inferred from the claim text.