There is provided an electronic circuit configured to calibrate a photon detection device comprising a plurality of silicon photomultipliers (51), said electronic circuit including a servo module (54) configured to gain control of said photon detection device. Such a circuit is remarkable in that said servo module comprises means (541) for obtaining information representative of the current at the terminals of each silicon photomultiplier of said plurality and means for processing (542) said information. representative of the current.
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