Development of a shaper and discriminator chip with time walk compensation for HFRS-TPC detector

Abstract

Abstract In this paper, a shaper and discriminator ASIC chip with time-walk compensation(TWC) is designed using 180 nm CMOS technology for a TPC detector which will be assembled on High energy FRagment Separator(HFRS) beamlines under construction. It comprises a fast CR-RC shaper, two comparators, and a TWC module. The peak time of the shaper is 30 ns, and the propagation delay of the comparator is 2.4 ns (25 mV Overdrive). When the dynamic range of the TPC output charge is from 10 fC to 1000 fC, the time error of the trigger signal produced by the ASIC was measured to be less than 2 ns.