Integration of CMS-ECAL supermodules : electronic components (VFE cards) and supermodule overview

Each ECAL supermodule (composed by 1700 lead tungstate crystals) contains 68 motherboards, connected, via flexible kapton cables, to the photodetectors of 25 crystals each. Signals belonging to groups of five crystals are amplificated and digitized by Very Front End (VFE) cards. Signals from the sensor capsules are routed to the VFE cards for temperature monitoring thermistors.