Design of handheld 500-MHz digital multi-channel analyzer on single board

Guoqiang ZENG; Xiaoping OUYANG; Mingfu YU; Qiang LI; Shilong WEI; Chuanhao HU; Jian YANG; Liangquan GE

doi:10.11889/j.0253-3219.2017.hjs.40.030401

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Design of handheld 500-MHz digital multi-channel analyzer on single board

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-19

- Design of handheld 500-MHz digital multi-channel analyzer on single board
- NUCLEAR TECHNIQUES Vol. 40, Issue 3, Article number: 030401(2017)
- 作者机构：
  
  1.成都理工大学地学核技术重点实验室成都 610059
  2.西北核技术研究所西安 710024
- 作者简介：
- 基金信息：
  
  National 863 Plan Project;Sichuan Youth Science & Technology Foundation
- DOI：10.11889/j.0253-3219.2017.hjs.40.030401
  CLC： TL82
- Received：24 October 2016，
  
  Revised：26 December 2016，
  
  Published：10 March 2017
- 稿件说明：
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Guoqiang ZENG, Xiaoping OUYANG, Mingfu YU, et al. Design of handheld 500-MHz digital multi-channel analyzer on single board[J]. Nuclear techniques, 2017, 40(3): 030401
DOI：

Guoqiang ZENG, Xiaoping OUYANG, Mingfu YU, et al. Design of handheld 500-MHz digital multi-channel analyzer on single board[J]. Nuclear techniques, 2017, 40(3): 030401 DOI： 10.11889/j.0253-3219.2017.hjs.40.030401.

摘要

针对Cs2LiYC16：CE（CLYC）闪烁晶体、掺硼塑料闪烁体等中子/γ探测器的电流脉冲波形的甄别，需要高速数字化多道脉冲幅度分析器。采用直接耦合方式设计高速模拟前端电路，将高速模数转换器（Analog-to-DigitalConverter，ADC）配合现场可编程逻辑门阵列（Field-Programmable Gate Array，FPGA）芯片实现数字化设计，在FPGA内部实现了高速数字滤波、脉冲幅度提取、基线扣除、谱线存储与传输等功能。通过嵌入式的PowerPC内核，实现替代外部控制器的复杂时序功能，并挂接通用串行总线（Universal Serial Bus，USB）外设芯片实现与外部计算机的高速双向数据传输。本文还设计了低噪声、大电流的开关电源，最终实现了可脱机独立运行的手持式单板高速数字多道。通过实测数字多道的模拟前端电路大信号带宽达110 MHz，小信号带宽达200 MHz，实时采样率为500 MHz，脉冲计数通过率大于10

-1

，线性度达0.999 8，连接NaI（Tl）、掺硼塑料闪烁体、LaBr

（Ce）等闪烁体探测器实测谱线合理，满足实际使用要求。

Abstract

Background

Rising time discrimination of current pulse signal by using Cs2LiYC16:CE (CLYC)

boron plastic scintillator and other neutron gamma detector

analog multi-channel and common digital multi-channel analyzer can not meet the requirements.

Purpose

This study aims to develop a high-speed digital multi-channel analyzer.

Methods

In this paper

by using the direct coupling way

a special high-speed analog front end circuit is designed. The high-speed analog-to-digital converter (ADC) is connected with field-programmable gate array (FPGA) could realize digital design well

then the system will finish data filtering

pulse amplitude extraction

baseline restorer

spectrum storage

transmission function and so on in the FPGA chip. The universal serial bus (USB) peripheral hangs on the embedded PowerPC kernel

the system can not only simplify the complex timing function of the external controller

but also realize high-speed data transmission with personal computer software. In this work

low noise and high current switching power supply is also designed

finally implemented a hand-held offline independent operation of the high speed digital multi-channel single plate.

Results

After the experimental tests

we can see that the digital multi-channel analog front end circuit designed in this paper used in NaI (Tl)

boron plastic scintillator

LaBr

(Ce) and other scintillation detector can reach to 110 MHz of large signal bandwidth and climb to 200 MHz of small signal bandwidth. Furthermore

it also has real-time sampling rate of 500 MHz

pulse counting rate by more than 10

-1

and the linearity is up to 0.999 8.

Conclusion

The ultimate measured scintillation spectrum in this paper can satisfy the actual requirement.

关键词

Keywords

references

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