FB-time digitizer

This module is foreseen as a contribution to the DELPHI experiment. The clock frequency determines the time resolution. With 166.6 MHz a binning of 3 ns is obtained. 2.5 ns binning is the limit. The 32 inputs have nearly no dead time. Between 2 leading edges of 2 input signals there should be a time distance of 5 or more clock pulses. The principle of the layout is very simple. The input state is continuously written into a memory. The memory address is automatically the time information. To double the time resolution with acceptable deadtime a simple serial data encoding is foreseen. (orig.)