According to the relationship between SiPM breakdown voltage(Vbr)and temperature,combined with the electrical characteristics of PTC thermistor and low-dropout linear regulator(LDO),a temperature-adaptive SiPM bias circuit is designed.In the temperature range of-20～30 ℃,the voltage test and count rate test of this circuit were carried out in the experimental group and the control group,in which the experimental group was the temperature adaptive bias output and the control group was the fixed bias output.The result shows that in the temperature range,overload voltage change of the experimental group is 1.01 V less than the overload voltage change of the control group,the coefficient of variation changes from 25.5％to 1.9％,the change of counting rate decreases from 30％of the control group to 1.6％,The counting rate of the experimental group showed a low temperature correlation,which varied between 100～106 cps,while the counting rate of the control group decreased significantly with the increase of temperature.This shows that SiPM has good temperature stability when using this bias circuit.
维普
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