Characterization of the coherent noise, electromagnetic compatibility andelectromagnetic interference of the atlas EM calorimeter front end board

摘要

The ATLAS Electromagnetic (EM) calorimeter (EMCAL) Front End Board (FEB) will belocated in custom-designed enclosures solidly connected to the feedtroughs. It is a complex mixed signal board which includes the preamplifier, shaper, switched capacitor array analog memory unit (SCA), analog to digital conversion, serialization of the data and related control logic. It will be described in detail elsewhere in these proceedings. The electromagnetic interference (either pick-up from the on board digital activity, from power supply ripple or from external sources) which affects coherently large groups of channels (coherent noise) is of particular concern in calorimetry and it has been studied in detail.