Input Mezzanine Board for the Fast Tracker (FTK) at ATLAS

The Fast Tracker(FTK) is an integral part of trigger upgrade program for the ATLAS experiment. At LHC Run2, which started operation in June 2015 at a center-of-mass energy of 13 TeV, the peak luminosity has exceeded 2×10^34 cm^{−2} s^{-1} and the LHC produce an average of 60 simultaneous collisions. The higher luminosity demands a more sophisticated trigger system with increased use of tracking information. The Fast Tracker is a highly-parallel hardware system that rapidly reconstructs tracks in the ATLAS inner-detector at the triggering stage. This paper focuses on the Input Mezzanine Board that is an input module of entire system.