The ATLAS tile calorimeter ROD injector and multiplexer board

Abstract The ATLAS Tile Calorimeteris a sampling detector composed by cells made of iron-scintillator tiles. The calorimetercell signals are digitized in the front-end electronics and transmitted to the Read-Out Drivers ( RODs) at the first level trigger rate. The RODreceives triggered data from up to 9856 channels and provides the energy, phase and quality factor of the signals to the second level trigger. The back-end electronics is divided into four partitions containing eight RODseach. Therefore, a total of 32 RODsare used to process and transmit the data of the TileCal detector. In order to emulate the detector signals in the production and commissioning of RODmodules a board called RODInjector and Multiplexer Board (RIMBO) was designed. In this paper, the RIMBO main functional blocks, PCB design and the different operation modes are described. It is described the crucial role of the board within the TileCal ROD test-benchin order to emulate the front-end electronics during the validation of RODboards as well as during the evaluation of the ROD signal reconstructionalgorithms. Finally, qualification and performance results for the injection operation mode obtained during the Tile Calorimeter ROD production testsare presented.