System noise of a digital pulse processing module for nuclear instrumentation

Suppressing noise is important for the digital pulse processing (DPP) in the nuclear radiation detection, which requires precise knowledge of system noise. This work presents a DPP electrical module based on an FPGA of Lattice and derives a simple system noise distribution by experiment and analysis of acquired digital data using this system. The measured noise distribution of this system shows a multivariate Gaussian mixture model with different means and variances as a simple predict.