Patent ID: 8921756
Filing Date: 2014-12-30
Classification: G01J,H01J

Abstract:
1. A photo-detector device comprising: a photomultiplier tube comprising a plurality of electrodes, the plurality of electrodes comprises a photocathode, an anode, a first dynode, intermediate dynodes and a last dynode; and a biasing circuit that comprises a sequence of voltage follower elements, a voltage divider and a current source; wherein the voltage divider is coupled across a high voltage power supply; wherein different dynodes are coupled to different voltage follower elements of the sequence of voltage follower elements; wherein control inputs of different voltage follower elements are coupled to different junctions of the voltage divider; wherein the current source is coupled to the voltage divider, to the sequence of the voltage follower elements, to the cathode and to a negative pole of the high voltage power supply such that the current source sets the current in the sequence of voltage follower elements; and wherein the anode is coupled to a load element coupled to a positive pole of the high voltage power supply and arranged to receive an output signal of the anode and convert it to an output signal of the photo-detector device.