The ATLAS Liquid Argon Collaboration
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The Atlas calorimeter preamplifier has been engineered both to 
perform within specification both in the nominal environment 
of the calorimeter(gamma ray dose of 20 kRads and neutron fluence 
of 10^13 n/cm^2 over 10 years) and in the presence of a variety 
of possible failures of the calorimeter. It can survive an 
electrostatic discharge of 4 mJ (2 kV on 2 nF). It is stable 
even if disconnected from the detector (due to a broken 
cable or feedthrough), if the input is shorted, and if the 
output is not connected to a load (due to a malfunctioning 
shaper or a broken trace). Its specification have been evaluated 
on a preproduction run and exceed the technical design report 
(TDR)requirements. Its reliability has been assessed according 
to MILSTRESS criteria. A mean time before failure (MBTF) of 
1.75 10^6 hours has been estimated, which meets the TDR 
requirement of a failure rate of less then 0.5% missing 
channels/year. It is built in a thick film hybrid technology 
both to achieve the low noise specification and to meet the 
design/production timetable. To reduce manufacturing costs 
the design rules have been kept as open as possible both to 
increase the production yield and to guarantee a a large pool 
of manufacturers with the technical capabilities to handle the 
production. A discussion of the manufacturing and reliability 
issues will be presented. Also the quality assurance and 
testing procedures will be described.

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The requirement, design, measured specifications of the ATLAS 
liquid argon calorimeter preamplifiers will be reviewed. The 
reliability estimate according to MILSTRESS standard, the 
experience gained so far in production, as well as the quality 
assurance and testing will be discussed.
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