Fast Discriminator with Zero-Crossover

概要

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A fast discriminator has been designed to discriminate the pulses from a photomultiplier anode. To match the capabilities of recent electronic circuits dealing with fast pulses in nuclear experiments, a precise time information is extracted from the discriminator using the triggering function of an Esaki-diode. This is done by determining the zero-crossing pint of pulses formed by adding reflected pulses returning from a coaxial cable connected to the input pulses. The performance of the fast discriminator has been examined by use of simulated pulses similar to those from a photomultiplier anode. The time jitter of output pulses is less than 1 ns over the range of input pulse heights between 8mA and its discriminating point of 0.8mA. Five outputs are provided of 4mA in pulse height and about 6ns in width. Although the output pulses do not have a rectangular form, the rise times at the beginning and the end of the pulses up to 2mA are about one nanosecond. An attenuator for fast pulses, matching 75Ω coaxial cables, is also reported.
社団法人応用物理学会の論文
1968-03-05