The Phase-I Trigger Readout Electronics Upgrade of the ATLAS Liquid Argon Calorimeters

The Super Cell has been proposed in the Phase-I LAr upgrade to replace the existing trigger system "Trigger Tower" in order to cope with higher luminosity environments in Run 3 at LHC. The finer granularity of the Super Cell trigger system requires higher data transmission capability and real time digital processing. The new system is also needed to be compatible with the existing trigger system. To fulfill these requirements, the new electronics including the front end and the back end are developed. So far, the demonstrator installed in 2014 shows good consistency with the main readout from the 2017 collision data.