Investigation of Transient Dose-Rate Effect on High-Speed Comparator SB9696
Investigation of Transient Dose-Rate Effect on High-Speed Comparator SB9696
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DOI：
10.1109/tns.2023.3288897
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发表时间：
2023-07
影响因子：
1.8
通讯作者：
Junlin Li;Yang Li;Yaxin Guo;Ruibin Li;Wei Chen;Yan Liu;Zhigang Peng;Jiaxin Liu;C. He;Pei Li
中科院分区：
文献类型：
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作者：
Junlin Li;Yang Li;Yaxin Guo;Ruibin Li;Wei Chen;Yan Liu;Zhigang Peng;Jiaxin Liu;C. He;Pei Li
本文采用实验和模拟相结合的方法，研究了高速比较器(SB9696)上的瞬时剂量率效应(TDRE)。实验结果表明，该比较器在脉冲伽马射线环境下有两种主要的暂态响应。首先，当每个脉冲的总剂量小于54.9rad(Si)时，只出现一个很短的扰动，并在几微秒内恢复。其次，当总剂量超过399.6拉德(Si)时，比较器被短暂中断，几微秒后恢复到欠压工作状态，并且在恢复到正常工作状态之前有很长的持续时间，这是比较器以前没有发现的罕见现象。提出了一种假设，认为短期干扰或中断主要是由比较器差动结构中的局部光电流引起的，而长欠压工作状态与持续时间较长的全局光电流有关。最后，通过SPICE仿真验证了算法的有效性。仿真结果表明，短时干扰或中断正是由比较器输出模块差动对中的局部光电流引起的，而由于全局光电流流经电源线时产生的跨轨坍塌效应，比较器的有效电源电压将降低，从而导致比较器的长欠压工作状态。
This article investigates transient dose-rate effect (TDRE) on a high-speed comparator (SB9696), combining both experimental and simulation methods. Experimental results show that this comparator has two main kinds of transient responses under pulsed gamma-ray environment. First, when the total dose per pulse is less than 54.9 rad(Si), only a short disturbance appears and recovers within several microseconds. Second, when the total dose is beyond 399.6 rad(Si), the comparator is shortly interrupted and then recovers to an under-voltage operation state after several microseconds, and the under-voltage state has a long duration before recovering to a normal working state, which is an uncommon phenomenon that has not been found previously for comparators. A hypothesis is proposed that the short disturbance or interrupt is mainly caused by local photocurrents in the differential structure of the comparator, while the long under-voltage operation state is related to the global photocurrent with a long duration. Lastly, they are successfully verified by SPICE simulations. Simulation results indicate that the short disturbance or interrupt exactly results from local photocurrents in the differential pairs of the comparator’s output module, and, due to the rail-span collapse effect as the global photocurrent flows through power supply lines, the effective supply voltage of the comparator would decrease, thus resulting in a long under-voltage operation state.