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The Phase-II Upgrade of the ATLAS Muon Detector requires new electronics forthe readout of the MDT drift tubes. The first processing stage, theAmplifier-Shaper-Discriminator (ASD), determines the performance of the readoutfor crucial parameters like time resolution, gain uniformity, efficiency andnoise rejection. An 8-channel ASD chip, using the IBM 130 nm CMOS 8RF-DMtechnology, has been designed, produced and tested. The area of the chip is 2.2x 2.9 square mm size. We present results of detailed measurements as well as acomparision with simulation results of the chip behaviour at three differentlevels of detail.

Performance of the new amplifier-shaper-discriminator chip for the ATLAS MDT chambers at the HL-LHC