Abstract
This paper presents a System on Programmable Chip (SoPC) design of a digitizer to determine particle features in nuclear physics covering arrival time and energy also for pileup events. The preamplified pulses from the radiation detector are digitized with a rate of 125 Ms/s. Pulse triggering and arrival time is measured by analysis of the pulse output after CR-RC filtering. Trapezoidal pulse shaping is applied for pulse-height energy measure and noise suppression. A new method is presented for trapezoidal flat top height analysis to ease calibration of the trapezoidal pulse shaping filter. The presented method also improves pulse analysis in terms of pileup identification and false pulse rejection. Experimental results obtain a repetitive pulse rate of 50 kHz. The digitizer is able to detect pileup events with a delay between pulses down to few micro seconds.
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