High-Voltage Source for SiPM Biasing with Enhanced Noise Performances

This work introduces an improved high-voltage source designed to enhance noise performance when biasing Silicon Photomultipliers (SiPMs). The system is based on a flyback regulator that adopts multiple noise-reduction methods to suppress the switching spikes generated from the DC-DC converter as an alternative to the Cockroft-Walton multiplier. Noise reduction methods are presented, and design choices are explained. A linear output regulation is included to dimmer the output and select the required SiPM breakdown voltage, and a Digital-to-Analog converter is used as a programmable reference. The proposed voltage source has been tested up to 200 V and 2 mA current load, reaching a peak-to-peak AC noise lower than 16 mV and a total RMS noise value lower than 5 mV. Performances are compared with a commercial source meter, used in several experiments as bias voltage source, showing better results.