Design of long-distance and large-dynamic-range of charge measurement circuit

Fuzhen XU; Hongguan YANG; Jinfan CHANG; Xiang LIU

doi:10.11889/j.0253-3219.2016.hjs.39.110402

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Design of long-distance and large-dynamic-range of charge measurement circuit

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-24

- Design of long-distance and large-dynamic-range of charge measurement circuit
- NUCLEAR TECHNIQUES Vol. 39, Issue 11, Article number: 110402(2016)
- 作者机构：
  
  1.湖南大学物理与微电子科学学院长沙 410082
  2.中国科学院高能物理研究所核探测与核电子学国家重点实验室北京 100049
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2016.hjs.39.110402
  CLC： TL99
- Received：01 March 2016，
  
  Revised：02 April 2016，
  
  Published：2016-11
- 稿件说明：
移动端阅览
Fuzhen XU, Hongguan YANG, Jinfan CHANG, et al. Design of long-distance and large-dynamic-range of charge measurement circuit[J]. Nuclear techniques, 2016, 39(11): 110402
DOI：

Fuzhen XU, Hongguan YANG, Jinfan CHANG, et al. Design of long-distance and large-dynamic-range of charge measurement circuit[J]. Nuclear techniques, 2016, 39(11): 110402 DOI： 10.11889/j.0253-3219.2016.hjs.39.110402.

摘要

介绍了大型高海拔空气簇射观测站（Large High Altitude Air Shower Observatory，LHAASO）空气簇射芯探测器阵列（Shower core detector array，SCDA）读出电子学方案的预研设计。系统采用基于电荷积分法的电荷测量方案，读出电子学通过同轴电缆接收光电倍增管输出的电流信号；采用在输入端与电荷积分放大器的虚地点之间接入等效50 Ω电阻的终端阻抗匹配方案，并通过Pspice仿真验证该阻抗匹配的可行性。电路测试结果表明，该电路能满足远距离10 bit大动态范围电荷测量的设计指标要求。

Abstract

Background

The air shower core detector array (SCDA) is one of the important detectors to be constructed at the heart of the KM2A (one kilometer square extensive air shower array) with the area of 5 000 m

in large high altitude air shower observatory (LHAASO).

Purpose

This study aims to design the readout electronics of SCDA for accurate charge measurement of the input photomultiplier tube (PMT) signal for three orders of magnitude.

Methods

A 50-Ω impedance match between the "virtual" grounding and input end is employed to measure the charge by the charge integration method. The feasibility of impedance match is verified by "Pspice" simulation tool. The output current signal from the PMT is collected and processed by the readout electronics of charge integration circuit

via

coaxial cable.

Results

The performance testing in the laboratory shows that the designed circuit satisfies design requirements of the long-distance and large-dynamic-range charge measurement.

Conclusion

The simulation and testing of "virtual" grounding impedance match validate the feasibility of this circuit. The readout electronics fulfills the application requirements of SCDA.

关键词

Keywords

references

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