A Microprocessor-Based Temperature-Compensated Bias-Voltage Source for a Silicon Photomultiplier

A microprocessor-based temperature-compensated bias voltage source is presented. It stabilizes the gain of a silicon photomultiplier (SiPM) within the temperature range of 10–60°C. The temperature dependence is compensated via dynamic correction of the bias voltage according to the measured temperature and individual parameters of a particular photomultiplier. Experimental studies were performed on two PM3325-WB-D0 SiPM specimens and confirmed the efficiency of the proposed approach: the gain spread does not exceed ±1.5% for an overvoltage of 1 V or more, and the gain spread is within ±2.5% for lower overvoltage values. The presented microprocessor-based temperature-compensated bias-voltage source can be scaled for multichannel systems and adapted to various types of micropixel silicon photomultipliers.