| Implementing method of optimum front-end conditioner based on Butterworth filter |
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| 作者姓名： | ZHANG Ruan-Yu LUO Xiao-Bing LI Tai-Hua |
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| 作者单位： | Key Laboratory for Radiation Physics and Technology of Ministry of Education of China, Physics Science and Technology College of Sichuan University, Chengdu 610064, China |
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| 基金项目： | Acknowledgments The authors are extremely grateful to Prof. Xu Zhuren and Dr. Xu Sikun for providing several suggestions during the study. |
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| 摘 要： | The front-end conditioner is an essential part of digital systems of nuclear spectrometer, which functions in two ways： （1） prevents saturation of the subsequent ADC; （2） limits the bandwidth of frequency to realize anti-aliasing. To realize the above-mentioned functions, an optimum front-end conditioner for a resistive feedback charge-sensitive preamplifier is designed. In the conditioner, the pole-zero compensation （P/Z compensation） technique was used to effectively filter signals from the preamplifier. The Butterworth filter was improved after the pole-zero position was optimally set up to shape the wave of output, which tallied with the whole system. The front-end conditioner can resolve the aberration of waveform of nuclear signals in a regular Butterworth filter. Compared with the traditional triple-pole filtering circuitry, the circuitry of this conditioner is more compact and flexible. Moreover, its output waveform is more symmetrical and the signal-to-noise ratio （SNR） is higher. The improvement in the resolution of spectrometer is also significant.
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| 关 键 词： | 数字式核子能谱仪 极点-零点补偿 巴特沃斯滤波器 前端调节器 |
| 收稿时间： | 2005-12-16 |
Implementing method of optimum front-end conditioner based on Butterworth filter |
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| ZHANG Ruan-Yu LUO Xiao-Bing LI Tai-Hua.Implementing method of optimum front-end conditioner based on Butterworth filter[J].Nuclear Science and Techniques,2006,17(4):232-236. |
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| Authors: | ZHANG Ruan-Yu LUO Xiao-Bing LI Tai-Hua |
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| Affiliation: | Key Laboratory for Radiation Physics and Technology of Ministry of Education of China, Physics Science and Technology College of Sichuan University, Chengdu 610064, China |
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| Abstract: | The front-end conditioner is an essential part of digital systems of nuclear spectrometer, which functions in two ways: (1) prevents saturation of the subsequent ADC; (2) limits the bandwidth of frequency to realize anti-aliasing. To realize the above-mentioned functions, an optimum front-end conditioner for a resistive feedback charge-sensitive preamplifier is designed. In the conditioner, the pole-zero compensation (P/Z compensation) technique was used to effectively filter signals from the preamplifier. The Butterworth filter was improved after the pole-zero position was optimally set up to shape the wave of output, which tallied with the whole system. The front-end conditioner can resolve the aberration of waveform of nuclear signals in a regular Butterworth filter. Compared with the traditional triple-pole filtering circuitry, the circuitry of this conditioner is more compact and flexible.Moreover, its output waveform is more symmetrical and the signal-to-noise ratio (SNR) is higher. The improvement in the resolution of spectrometer is also significant. |
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| Keywords: | Digital nuclear spectrometer Pole-zero compensation Butterworth filter |
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