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首页> 外文会议>2013 IEEE Nuclear Science Symposium and Medical Imaging Conference >Development of new circuit with CSA for X-ray astronomical SOI pixel detector - improving energy resolution
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Development of new circuit with CSA for X-ray astronomical SOI pixel detector - improving energy resolution

机译：开发具有CSA的X射线天文SOI像素检测器新电路-提高能量分辨率

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We have been developing a monolithic active pixel sensor with the silicon-on-insulator (SOI) CMOS technology for use in future X-ray astronomical satellite mission. Our objective is to replace the X-ray Charge Coupled Device (CCD), which is the standard detector in the field, by offering high coincidence time resolution (∼ 50 ns), superior hit-position readout time (∼ 10 μs), and wider bandpass (0.5 – 40 keV) in addition to having comparable performances in imaging spectroscopy. In order to realize this detector, we have developed prototype detectors, called “XRPIX” series. XRPIX contains comparator circuit in each pixel to detect an X-ray photon injection; it offers intra-pixel hit trigger (timing) and two-dimensional hit-pattern (position) outputs. Therefore, XRPIX is capable of direct access to selected pixels to read out the signal amplitude. In our previous study, we evaluated its basic performance and obtained the X-ray spectra by this system. The next step is improvement in spectroscopic performance. Then, we designed a new prototype, called “XRPIX3”, which has charge sensitive amplifier (CSA) in each pixel. The pixel circuit with CSA works good. It is 3.4 times higher gain as compared with normal pixel circuit. Furthermore, XRPIX3 resolved Mn-Kα and Mn-Kβ successfully for the first time in our series. The readout noise is 33 e- rms and the energy resolution is about 300 eV FWHM at 5.9 keV. In this paper, we report on the design and test results of this new device.
机译：我们一直在开发采用绝缘体上硅（SOI）CMOS技术的单片有源像素传感器，以用于未来的X射线天文卫星任务。我们的目标是通过提供高的重合时间分辨率（〜50 ns），卓越的命中位置读取时间（〜10μs）和更高的重合度，来代替X射线电荷耦合器件（CCD），它是本领域的标准探测器。除了在成像光谱方面具有可比的性能外，还具有更宽的带通（0.5 – 40 keV）。为了实现这种检测器，我们开发了原型检测器，称为“ XRPIX”系列。 XRPIX在每个像素中包含比较器电路，以检测X射线光子注入；它提供像素内点击触发（定时）和二维点击模式（位置）输出。因此，XRPIX能够直接访问选定的像素以读出信号幅度。在我们以前的研究中，我们评估了其基本性能并通过该系统获得了X射线光谱。下一步是改善光谱性能。然后，我们设计了一个名为“ XRPIX3”的新原型，该原型在每个像素中都有电荷敏感放大器（CSA）。使用CSA的像素电路效果很好。增益是普通像素电路的3.4倍。此外，XRPIX3在我们的系列中首次成功分离了Mn-Kα和Mn-Kβ。读出噪声为33 erms，能量分辨率为5.9 keV时约为300 eV FWHM。在本文中，我们报告了这种新设备的设计和测试结果。

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