Design of the Front-End Readout Electronics for ATLAS Tile Calorimeter at the sLHC

Abstract

We present a detailed design for the upgrade of the analog front-end electronics for the ATLAS Tile Calorimeter (TileCal) at the sLHC by using the latest deep-micron-technology based, commercial off-the-shelf (COTS) components. We believe that with the latest technology based analog devices, the significant improvements in radiation tolerance are possible. The front-end analog electronics presents a 17-bit dynamic range in readout of PMT signals. The PMT output signal is processed with a 7-pole passive LC shaper, followed by a pair of bi-gain amplifiers and two 40Msps sampling ADCs. The readout system is capable of measuring energy deposition in a single calorimeter cell from ∼220MeV to 1.3TeV with full digital Level-1 trigger capability for the ATLAS experiment at the sLHC. The other on-board features include slow current integrator used for detector calibration with cesium source to normalize the PMT gains and the charge injection for calibrating linearity and dynamic range for the readout electronics. A total of ∼10,000 channels of readout electronics are needed in the upgrade to replace the current system at the LHC.