Experimental results on a detector capacitance compensation technique for multiplexing SiPM channels
Experimental results on a detector capacitance compensation technique for multiplexing SiPM channels
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DOI：
10.1016/j.nima.2018.10.205
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发表时间：
2020-02-21
影响因子：
1.4
通讯作者：
Kwon, Inyong
中科院分区：
文献类型：
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作者：
Kim, Duckhyun;Kim, Chang-Hwoi;Kwon, Inyong
本工作提出了一种用于阵列型SiPM辐射探测器的探测器电容补偿电路，同时保持高质量的脉冲信息，包括能量和时间分辨率。所提出的配置的主要组成部分，一个单位增益放大器利用米勒效应，保持相同的交流电压的检测器的两侧，导致在节点之间没有有效的检测器电容。该技术理想地允许组合通道，而不会在信号的上升时间和幅度方面性能劣化，该信号的上升时间和幅度可能是由于在信号复用方案中SiPM单元并联短路时的累积电容而引起的。为了验证该结构，我们设计并制作了一个测试板，在16像素SiPM阵列和传统电荷敏感放大器之间插入一个单位增益放大器作为测试电路。在前端系统输出端的测量脉冲表明，探测器补偿技术可以成功地减轻性能下降的上升时间和幅度以及符合时间。这种技术可以在需要大量阵列型检测器的多路复用读出的许多应用中采用，例如，货物扫描技术、核电站设施的辐射监测以及PET和SPECT等先进的医学成像仪器。
This work presents a detector capacitance compensation circuit for array-type SiPM-based radiation detectors while maintaining high-quality pulse information, including energy and time resolution. The major component of the proposed configuration, a unity-gain amplifier exploiting the Miller effect, maintains the same AC voltages on two sides of a detector, resulting in no effective detector capacitance between the nodes. This technique ideally allows combining channels without performance degradation in terms of rise time and amplitude of signals that can be caused due to the accumulated capacitance when SiPM cells are shorted in parallel in a signal multiplexing scheme. In order to verify the configuration, we designed and built a test board inserting a unity-gain amplifier between a 16-pixel SiPM array and a conventional charge-sensitive amplifier as a preamplifier. The measured pulses at the output of the front-end system show that the detector compensation technique can successfully mitigate performance degradation of rise time and amplitude as well as coincidence time. This technique can be adopted in many applications that require a multiplexed readout of a large number of array-type detectors, e.g., in cargo scanning technologies, radiation monitoring in nuclear plant facilities, and advanced medical imaging instruments such as PET and SPECT.