Auto Calibration Method for the Front-end Electronics in Digital Hadron Calorimeter

DHCAL (Digital Hadron Calorimeter) is a new kind of instrumentation in particle physics. With just 1-bit readout, it can get the particle information fast with low power consumption. The simple readout structure puts a large challenge on system calibration. The aim of this study was to design and implement an auto calibration system for the readout electronics in DHCAL. An auto test system based on statistics was developed in this study. Two kinds of calibration circuits were designed and tested. Results indicated that the calibration circuits were effective. This method can be applied to both small-scale and large-scale system. At last, the calibration circuits have been applied on the readout electronics for CEPC DHCAL pre-prototype.