Fully integrated digital readout for the new Fast Interaction Trigger for the ALICE upgrade

Fully integrated digital readout, pulse analysis, extraction of time and charge, signal alignment, multiplicity analysis and trigger generation electronics were developed for the new Fast Interaction Trigger (FIT) as a part of the upgrade of the ALICE detector at the CERN LHC (Abelev et al., 2014 [1] ; Trzaska, 2017 [2] ). FIT will serve as the main luminometer, collision time, multiplicity, centrality, and reaction plane detector for the ALICE experiment during Run 3 and 4 of the LHC. Among the many challenges of this project are a high dynamic range (from 1 to 500 MIP per channel), requirement to operate with the sustained bunch crossing of 25 ns, provide single-MIP time resolution below 50 ps, complete the entire signal processing and trigger generation within 200 ns.