Abstract
A Fastbus ADC and TDC module has been developed for the trigger of the L3 experiment. It provides fast and precise integration of successive pairs of charges derived from the charge division wires of the central tracking chamber, as well as a measurement of their drift times. The minimum separation time between digitizations is 170 ns. The charges are measured with a precision of 1 pC up to charges of 600 pC. The drift times are measured in 50 ns time bins. A system including 60 modules provides data allowing the reconstruction of charged particle tracks in three dimensions. This information is used in background rejection algorithms of the second and third level triggers.
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