Charge-sensitive front-end electronics with operational amplifiers for CdZnTe detectors

Charge-sensitive front-end electronics with operational amplifiers for CdZnTe detectors
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用于 CdZnTe 探测器的带运算放大器的电荷敏感前端电子器件

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发表时间：
2016
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通讯作者：
P. Kaever
P. Kaever
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作者：
P. Födisch;M. Berthel;B. Lange;T. Kirschke;W. Enghardt;P. Kaever

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碲锌镉（CdZnTe，CZT）辐射探测器由于其在室温下的高空间分辨率和光谱能量性能而适用于各种应用。然而，最先进的检测器系统需要高性能的读出电子设备。虽然专用集成电路（ASIC）是用于读出的适当解决方案，但是高动态范围和高吞吐量的要求在任何商业电路中都是不可用的。因此，本研究开发的模拟前端电子与运算放大器的8×8像素CZT探测器。为了这个目的，我们建模的CZT检测器与相关的电荷敏感放大器（CSA）的电气等效电路。基于详细的网络分析，电路设计是由各种功能，如弹道赤字，电荷电压增益，上升时间和噪声电平的数值。通过合成检测器信号和像素检测器进行性能的验证。像素探测器组件和22Na放射源的实验结果强调了测量能量的深度依赖性。在基于加权势拟合的深度校正的脉冲处理之后，对于511keV的尖峰，能量分辨率为2.2%（FWHM）。
Cadmium zinc telluride (CdZnTe, CZT) radiation detectors are suitable for a variety of applications, due to their high spatial resolution and spectroscopic energy performance at room temperature. However, state-of-the-art detector systems require high-performance readout electronics. Though an application-specific integrated circuit (ASIC) is an adequate solution for the readout, requirements of high dynamic range and high throughput are not available in any commercial circuit. Consequently, the present study develops the analog front-end electronics with operational amplifiers for an 8×8 pixelated CZT detector. For this purpose, we modeled an electrical equivalent circuit of the CZT detector with the associated charge-sensitive amplifier (CSA). Based on a detailed network analysis, the circuit design is completed by numerical values for various features such as ballistic deficit, charge-to-voltage gain, rise time, and noise level. A verification of the performance is carried out by synthetic detector signals and a pixel detector. The experimental results with the pixel detector assembly and a 22Na radioactive source emphasize the depth dependence of the measured energy. After pulse processing with depth correction based on the fit of the weighting potential, the energy resolution is 2.2% (FWHM) for the 511 keV photopeak.