Linear Gate with Stretcher

A linear gate with stretcher has been designed to stretch a gated fast pulse to a slow pulse of 0.5 µs rise time and long tail which is acceptable to usual pulse height analyzers. Its performance has been examined by use of simulated pulses similar to those from a photomultiplier anode. Although there is a 3% cut off of the dynamic range, the departure from linearity is less than a few percent up to 20 mA input, which corresponds to a slow pulse output of 2 V. The gate pedestal without input is 0.5% of dynamic range and the feed-through without gating pulses is less than 1%. From the monitor output one can extract timing information which enables one to adjust the gating time within a range of a few ns.