Time Resolution Simulations of Monolithic CMOS Sensors with Internal Gain

Low Gain Avalanche Detectors represent one of the most mature technologies of solid-state detection for time measurements in particle physics experiments. However, due to their hybrid approach and their non-commercial grade process, the production and assembly costs are considerable. A possible solution is to develop monolithic CMOS sensors designed for timing applications which has been one of the goals of the 3rd run of the ARCADIA project. Indeed, a first prototype of monolithic CMOS sensor in 110nm with internal gain has been developed with the support of simulations to predict the performance of the designed system. A Monte Carlo software, Garfield++, has been employed to generate realistic signals coming out from the sensor while a Computer Aided Design software has been used to simulate the electronics response. The total time resolution extracted from the simulations is around 100ps rms.