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We describe the design of the analog portion of an electronics system to process signals from the photomultiplier tubes of the ATLAS Tile Calorimeter. The system has a 16-bit dynamic range and is capable of measuring energy depositions in a single calorimeter cell from ∼20MeV to ∼1.3TeV. In order to maintain the calorimeter calibration at the 1% level the system includes a charge injection circuit...
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