In the study of particle detectors

based on digital signal processing

since the particle detectors for the relatively low energy of the incident particle

the noise characteristic of the circuit impact on the ultimate performance of the circuit is very large.Particle detector readout circuit noise model created in MATLAB Simulink environment

including thermal noise

shot noise and low-frequency noise.Simulation of the three types of the power spectral density of the noise on the basis of the model in this article a good fit to the three noise power spectral density function curve simulation results with the theoretical analysis of the curve obtained with the relationship of the input signal frequency changes. Further

the results are consistent with the simulation results with noise sequence of the three noise power spectral density function curve obtained by the power spectrum calculating

in order to verify the generated noise sequence model is correct.