Design of the reset and calibration circuits in a dual stage charge sensitive processing chain based on Time-over-Threshold technique for tracking applications

This paper presents the details of the architecture and design of reset (both continuous and pulsed) and calibration circuits implemented in a dual stage charge sensitive processing chain dedicated for input charge measurements based on a Time-over-Threshold (ToT) technique. The combination of two different types feedback reset systems enables solving important problems of charge processing chains, like pile-up effects and excessive dead time of ToT processing in case of artifact hits´ overload. The comparison of proposed solution with other discharge circuits described in the literature is also included.