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首页> 外文期刊>Journal of instrumentation: an IOP and SISSA journal >Improvement of spectroscopic performance using a charge-sensitive amplifier circuit for an X-ray astronomical SOI pixel detector
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Improvement of spectroscopic performance using a charge-sensitive amplifier circuit for an X-ray astronomical SOI pixel detector

机译：使用用于X射线天文SOI像素检测器的电荷敏感放大器电路改善光谱性能

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摘要

We have been developing monolithic active pixel sensors series, named “XRPIX”, based on the silicon-on-insulator (SOI) pixel technology, for future X-ray astronomical satellites. The XRPIX series offers high coincidence time resolution (~1μs), superior readout time(~10μs), and a wide energy range (0.5–40 keV). In the previous study, we successfully demonstrated X-ray detection by event-driven readout of XRPIX2b. We here report recent improvements in spectroscopic performance. We successfully increased the gain and reduced the readout noise in XRPIX2b by decreasing the parasitic capacitance of the sense-node originated in the buried p-well(BPW). On the other hand, we found significant tail structures in the spectral response due to the loss of the charge collection efficiency when a small BPW is employed. Thus, we increased the gain in XRPIX3b by introducing in-pixel charge sensitive amplifiers instead of having even smaller BPW. We finally achieved the readout noise of 35 e~-(rms) and the energy resolution of 320 eV(FWHM) at 6 keV without significant loss of the charge collection efficiency.
机译：我们一直在开发基于绝缘体上硅（SOI）像素技术的单片式有源像素传感器系列，称为“ XRPIX”，用于未来的X射线天文卫星。 XRPIX系列具有较高的重合时间分辨率（〜1μs），出色的读出时间（〜10μs）和宽泛的能量范围（0.5–40 keV）。在先前的研究中，我们通过事件驱动的XRPIX2b读数成功演示了X射线检测。我们在这里报告了光谱性能的最新改进。通过减少源自掩埋p阱（BPW）的检测节点的寄生电容，我们成功地提高了增益，并减少了XRPIX2b中的读出噪声。另一方面，由于使用小BPW时电荷收集效率的损失，我们在光谱响应中发现了明显的尾部结构。因此，我们通过引入像素内电荷敏感放大器而不是更小的BPW来增加XRPIX3b的增益。我们最终在6 keV时实现了35 e〜-（rms）的读出噪声和320 eV（FWHM）的能量分辨率，而不会显着降低电荷收集效率。

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