Study of time-domain digital pulse shaping algorithms for nuclear signals

LOW ENERGY ACCELERATOR AND RADIATION APPLICATIONS

Study of time-domain digital pulse shaping algorithms for nuclear signals

ZHOU Jianbin，

ZHOU Wei，

LEI Jiarong，

TUO Xianguo，

ZHU Xing，

LIU Yi

Nuclear Science and Techniques

Vol.23, No.3

pp.150-155

Published in print 20 Jun 2012

DOI：10.13538/j.1001-8042/nst.23.150-155

37503

With the development on high-speed integrated circuit, fast high resolution sampling ADC and digital signal processors are replacing analog shaping amplifier circuit. This paper firstly presents the numerical analysis and simulation on R-C shaping circuit model and C-R shaping circuit model. Mathematic models are established based on 1^st order digital differential method and Kirchhoff Current Law in time domain, and a simulation and error evaluation experiment on an ideal digital signal are carried out with Excel VBA. A digital shaping test for a semiconductor X-ray detector in real time is also presented. Then a numerical analysis for Sallen-Key (S-K) low-pass filter circuit model is implemented based on the analysis of digital R-C and digital C-R shaping methods. By applying the 2^nd order non-homogeneous differential equation, the authors implement a digital Gaussian filter model for a standard exponential-decaying signal and a nuclear pulse signal. Finally, computer simulations and experimental tests are carried out and the results show the possibility of the digital pulse processing algorithms.

R-C shapingC-R shapingNuclear pulseDigital S-K filterDigital Gaussian filter

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