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《核技术》(英文版) ›› 2014, Vol. 25 ›› Issue (1): 10403-010403.

• 核电子学与仪器 •

### Study of recursive model for pole-zero cancellation circuit

1. 1College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China
2Engineering Research Center of Nuclear Technology Application, Ministry of Education, East China institute of Technology, Nanchang 310013, China
• 出版日期:2014-02-24 发布日期:2014-02-24
• 通讯作者: HONG Xu E-mail:hongxucdut@163.com
• 基金资助:

Supported by National High Technology Research and Development Program of China (863 Program) (No 2012AA061804-03)

### Study of recursive model for pole-zero cancellation circuit

ZHOU Jian-Bin , HONG Xu , WANG Ren-Bon , ZHOU Wei , HU Yun-Chuan , WAN Xin-Feng , DU Xin

1. 1College of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China
2Engineering Research Center of Nuclear Technology Application, Ministry of Education, East China institute of Technology, Nanchang 310013, China
• Online:2014-02-24 Published:2014-02-24
• Contact: HONG Xu E-mail:hongxucdut@163.com
• Supported by:

Supported by National High Technology Research and Development Program of China (863 Program) (No 2012AA061804-03)

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.

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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