Study of recursive model for pole-zero cancellation circuit |
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Authors: | ZHOU Jian-Bin HONG Xu WANG Ren-Bo ZHOU Wei HU Yun-Chuan WAN Xin-Fengand DU Xin |
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Affiliation: | [1]1College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China [2]Engineering Research Center of Nuclear Technology Application, Ministry of Education, East China institute of Technology, Nanchang 310013, China |
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Abstract: | The output of charge sensitive amplifier(CSA) is a negative exponential signal with long decay time which will result in undershoot after C-R differentiator.Pole-zero cancellation(PZC) circuit is often applied to eliminate undershoot in many radiation detectors.However,it is difficult to use a zero created by PZC circuit to cancel a pole in CSA output signal accurately because of the influences of electronic components inherent error and environmental factors.A novel recursive model for PZC circuit is presented based on Kirchhoff's Current Law(KCL) in this paper.The model is established by numerical differentiation algorithm between the input and the output signal.Some simulation experiments for a negative exponential signal are carried out using Visual Basic for Application(VBA) program and a real x-ray signal is also tested.Simulated results show that the recursive model can reduce the time constant of input signal and eliminate undershoot. |
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Keywords: | Pole-zero cancellation Numerical analysis in time domain Numerical simulations |
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