B. Hallgren, F. Bal, G. Barr, P. Buchholz, F. Formenti, W. Funk, Y. Kozhevnikov, A. Lacourt, G. Laverriere, M. Martini, A. Papi, P. Ponting, M. Sozzi, O. Vossnack, H. Wahl
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High rate large dynamic range analog circuitry and digitizers for fast calorimetry
This paper describes the issues encountered in the design of a large dynamic range digitizer for calorimetry. A gain switching technology developed for the liquid krypton calorimeter of the NA48 CP-violation experiment at CERN is described in detail. 14 bit dynamic range and better than 300 ps time resolution were achieved in beam tests with an 8 channel prototype. A mixed analog/digital ASIC has been developed. A 13500 channel system is being produced which will be put into operation in 1996.
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