Report of the subgroup on deadtimeless front-end electronics

The subgroup on deadtimeless front-end electronics and data acquisition systems met for two days on June 28-29. This report summarizes some of the material presented at these discussions. It concentrates on the need for and technical obstacles to the development of high rate deadtimeless front-end electronics for silicon vertex trackers. The large yield of b bar b events at hadron colliders indicate the desirability of level 1 trigger rates of order 50-100 kHz. In order to eliminate undesirable deadtime the required front-end electronics needs to be fully pipelined and capable of supporting subsequent trigger levels without incurring any deadtime. In these discussions it has been assumed that the level 1 latency time is of order 2-4 μs