New ASICs for the Very Front-End Card Upgrade of the CMS ECAL Barrel at the HL-LHC

Abstract

The High Luminosity LHC (HL-LHC), the foreseen LHC upgrade, will entail higher levels of instantaneous luminosity by about a factor of 5 from current levels.The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid detector (CMS) will experience a challenging environment during the HL-LHC phase. As a matter of fact higher event pileup, increasing data rates and harsher radiation environment are some of the expected conditions.A complete redesign of the ECAL on-detector readout electronics have been performed in order to obtain precision timing, noise mitigation and increased sampling rate. As a result a high-resolution, high-speed ADC has been designed to convert the signal from the front-end Trans-Impedance Amplifier (TIA) stage. Each readout channel will produce a large amount of data which will require fast data processing circuitry and high speed serial links. A new digital architecture has been developed in order to decrease the data bandwidth by means of lossless data compression. These functions has been integrated in two ASICs: CATIA and LiTE-DTU, designed in commercial CMOS 130 nm and 65 nm technology, respectively.