A low noise APD readout ASIC for electromagnetic calorimeter in HIEPA
A low noise APD readout ASIC for electromagnetic calorimeter in HIEPA
复制标题
HIEPA电磁热量计低噪声APD读出ASIC
DOI：
10.1016/j.nima.2020.164686
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发表时间：
2021-01-01
影响因子：
1.4
通讯作者：
Hu, Yann
中科院分区：
文献类型：
--
作者：
Liu, Chao;Luo, Xuan;Hu, Yann
本文介绍了一种用于2-7 GeV强流电子正电子加速器电磁量能器的四通道雪崩光电二极管读出专用集成电路。雪崩光电二极管的大检测器电容将增加等效噪声电荷并延长前端振荡器的上升时间，导致ASIC的能量和时间分辨率衰减。提出了一种低噪声整形器和一种五阶高线性整形器来降低由270 p（F）探测器电容引起的噪声。该ASIC采用标准的0.18 μ m CMOS工艺制造，芯片尺寸为1.1 mm × 2.4 mm，输入电荷范围为4.8 fC ~ 400 fC。ASIC的事件速率可以达到40万计数/秒。整形器的非线性误差小于2%。在整形时间为800 ns时，测量的信噪比优于7.8。在100 fC的输入电荷下，ASIC的时序分辨率优于300 ps。
This paper presents a 4-channel avalanche photodiode readout ASIC for the electromagnetic calorimeter in the 2-7 GeV high intensity electron positron accelerator. A large detector capacitance of the avalanche photodiode will increase equivalent noise charge and extend rise time of the front-end preamplifier, resulting in attenuated energy and time resolution of the ASIC. A low-noise preamplifier and a 5th-order high-linearity shaper were proposed to decrease the noise induced by a 270 p(F) detector capacitance. The ASIC is fabricated using a standard 0.18-mu m CMOS technology, and the die size of the prototype chip is 1.1 mm x 2.4 mm. The input charge range of the ASIC is from 4.8 fC to 400 fC. The event rate of the ASIC can achieve 400k count/s. Nonlinear error of the shaper is less than 2%. The measured signal to noise ratio is better than 7.8 at a shaping time of 800 ns. The timing resolution of the ASIC is better than 300 ps at an input charge of 100 fC.