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The Selection of a radiation-tolerant DAC for the LHC (Part II: CMOS technology)

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2003-02-14
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Lozano Rogado, Jesús
Agapito Serrano, Juan Andrés
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Instituto de Microelectrónica de Barcelona CNM-CSIC
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Total dose & neutron tests on commercial CMOS digital-to-analog converters have been carried out. These results are related to those ones presented in the previous paper. This kind of devices is much more sensitive to ionizing radiation than to neutrons. That radiation changes the value of the MOSFET threshold voltage and this can put digital circuits out of action. In this case, the gradual destruction of the digital inputs was observed as a diminution of the output voltage levels. Also, the gamma radiation generates leakage currents that increase the consumption. Due to these converters tolerated less total radiation dose, their use in the LHC has been refused and the fast bipolar technology converters will be employed.
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Conferencia de Dispositivos Electrónicos (CDE 2003) (4. 2003. Calella de la Costa, España). Spanish Conference on Electron Devices.
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[1] Anelli G., “Conception et characterisation de circuits integrés resistants aux radiations pour les detecteurs de particles du LHC en technologies CMOS submicroniques profondes”, Ph. D. Institut National Politechnique de Grenoble, 2000. http://www.cern.ch/RD49/RD49Docs/anelli/these.html [2] F. Faccio “COTS for LHC Radiation Environment: The Rules of the Game”. Proceedings of the 6th Workshop on Electronics for the LHC Experiments, Krakow, Poland, 2000, pp 50-63 [3] D.A. Johns & K. Martin "Analog integrated circuit design", John Willey, 1997 [4] G. Messenger, M. Ash “The Effects of Radiation on Electronic Systems”. New York, Van Nostrand Reinhold, 2nd Edition, 1992 [5] Dentan, M. “Radiation Effects on Electronic Components and Circuits” LHC training course, April 2000.