Design, development and evaluation of a resistor-based multiplexing circuit for a 20×20 SiPM array.
Design, development and evaluation of a resistor-based multiplexing circuit for a 20×20 SiPM array.
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DOI：
10.1016/j.nima.2016.01.081
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发表时间：
2016-04-21
期刊：
影响因子：
--
通讯作者：
Shao Y
中科院分区：
文献类型：
--
作者：
Wang Z;Sun X;Lou K;Joseph M;Zhou R;Yang C;Zhu X;Shao Y
开发具有多个硅光电倍增管 (SiPM) 阵列的大尺寸闪烁体探测器的一项技术挑战是读出大量探测器输出通道。为了实现这一目标，人们研究并应用了不同的信号复用电路，并在性能和成本效益之间进行了权衡。基于电阻器的多路复用电路表现出简单性和信号完整性，但也存在不同通道之间定时偏移的缺点。在这项研究中，开发了一种用于大尺寸 SiPM 阵列读出的基于电阻器的多路复用电路，并通过仿真和实验研究进行了评估。与用于多阳极 PMT 的多路复用电路类似，接地电阻和分支电阻连接到每个 SiPM 输出通道。使用接地电阻可以同时减少不同通道之间的信号串扰，提高时序性能。接地和分支电阻值都经过优化，以保持事件能量、定时和定位的平衡性能。多路复用电路在紧凑的 PCB 上实现，并应用于平板探测器，该探测器由 32×32 LYSO 闪烁体晶体组成，光学耦合到 5×5 SiPM 阵列，总共 20×20 个输出通道。测试结果表明，在 22Na 泛光源照射下，所有 1024 个 LYSO 晶体（每个晶体尺寸为 2×2×30 mm3）均具有出色的晶体识别能力。从典型晶体图谱测得的峰谷比约为3:1至6.6:1，平均单晶能量分辨率约为17.3%，平均单晶时间分辨率约为2 ns。正如一些其他基于电阻器的多路复用电路设计中所报告的那样，没有观察到不同晶体之间的时序偏移。总之，我们设计并实现了一种实用的基于电阻的多路复用电路，该电路可轻松应用于读出具有良好探测器性能的大型 SiPM 阵列。
One technical challenge in developing a large-size scintillator detector with multiple Silicon Photomultiplier (SiPM) arrays is to read out a large number of detector output channels. To achieve this, different signal multiplexing circuits have been studied and applied with different performances and cost-effective tradeoffs. Resistor-based multiplexing circuits exhibit simplicity and signal integrity, but also present the disadvantage of timing shift among different channels. In this study, a resistor-based multiplexing circuit for a large-sized SiPM array readout was developed and evaluated by simulation and experimental studies. Similarly to a multiplexing circuit used for multi-anode PMT, grounding and branching resistors were connected to each SiPM output channel. The grounding resistor was used to simultaneously reduce the signal crosstalk among different channels and to improve timing performance. Both grounding and branching resistor values were optimized to maintain a balanced performance of the event energy, timing, and positioning. A multiplexing circuit was implemented on a compact PCB and applied for a flat-panel detector which consisted of a 32×32 LYSO scintillator crystals optically coupled to 5×5 SiPM arrays for a total 20×20 output channels. Test results showed excellent crystal identification for all 1024 LYSO crystals (each with 2×2×30 mm3 size) with 22Na flood-source irradiation. The measured peak-to-valley ratio from typical crystal map profile is around 3:1 to 6.6:1, an average single crystal energy resolution of about 17.3%, and an average single crystal timing resolution of about 2 ns. Timing shift among different crystals, as reported in some other resistor-based multiplexing circuit designs, was not observed. In summary, we have designed and implemented a practical resistor-based multiplexing circuit that can be readily applied for reading out a large SiPM array with good detector performance.
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影响因子：
1.8
作者：
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通讯作者：
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影响因子：
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DOI：
10.1016/j.nima.2012.07.029
发表时间：
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期刊：
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影响因子：
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