Performance simulations and characterization of RD53 pixel chips for ATLAS and CMS HL-LHC upgrades

<!--HTML-->The RD53B pixel readout chip has been submitted for fabrication, meeting specifications of the ATLAS and the CMS experiments for HL-LHC upgrades. Performance characterization of a readout chip in terms of link data rate, average readout latency and efficiency of hit data is essential to evaluate operation of pixel sensors at an extreme interaction rate. At the same time it is complex due to its dependence on various environmental conditions and operational settings. In this work, readout performance parameters and their simulation results for various detector positions of the ATLAS and the CMS experiments are presented.