Phase-II Readout Electronics Upgrades of the ATLAS LAr Calorimeter

The high-luminosity LHC will operate at 5-7 times the luminosity of the original design. New readout electronics are necessary due to the increased radiation damage and for compatibility with the new trigger system. The 182,500 LAr calorimeter cells will be readout at 40 MHz with a 16 bit dynamic range. First prototypes of the front-end electronics using 65 and 130 nm CMOS technologies have been tested. Design studies for the off-detectors digital filtering algorithms and bandwidth requirements have been performed. An overview of the LAr Phase-II electronic design is presented.