Instrumentation amplifiers and voltage controlled current sources for LHC cryogenic instrumentation
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2000
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Abstract
Instrumentation amplifiers and voltage controlled current sources have been designed by using single operational amplifiers (OPA124, TLE2071 and OPA627). Their performance has been evaluated in the laboratory and under neutron radiation. On line measurements of the offset voltages, offset currents, closed loop gain, CMRR and bias currents were performed on the amplifiers. The current sources were set to a constant value and the current was monitored on-line. The radiation tolerance of commercial voltage references has also been investigated.
The radiation was performed out in ITN (Portugal) research nuclear reactor. In comparison to previous experimental campaigns the gamma radiation has been reduced by a factor 15 for a given neutron dose. This is achieved thanks to a recently constructed facility for neutron beam extraction
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© 2000 CERN (License: CC-BY-3.0).
ISSN: 0007-8328.
Workshop on Electronics for LHC Experiments(6. 2000. Krakow, Polonia)
This work has been financed by the co-operation agreement K476/LHC between CERN & UCM, by the Spanish research agency CICYT (TIC98-0737), by the Private Foundation “Miguel Casado San José”, and by the Portuguese research agency ICCTI (CERN/15181/99).