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