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Simulation studies on the transient dose rate effect of analog delay locked loops
Microelectronics Reliability ( IF 1.6 ) Pub Date : 2021-05-12 , DOI: 10.1016/j.microrel.2021.114149
Yang Li , Yaxin Guo , Chaohui He , Jiaxin Liu , Yonghong Li , Pei Li

This paper presents the transient dose rate (TDR) effect of analog Delay Locked Loops (DLLs). The analog DLL circuits are built upon a previous design, and the typical photocurrents are calculated by the Sentaurus TCAD. Both single double-exponential and dual double-exponential functions are successfully introduced to fit the different photocurrent waveforms with change of the simulated nodes, which then are integrated into the SPICE models for later circuit simulations. Firstly, the radiation effect of individual sub-circuits (e.g. charge pump) and their coupling relationships are analyzed. The simulation results show that the current-charge pump as the most sensitive module can result in the biggest clock error, followed by the voltage-controlled delay line; although the global radiation effect of DLL (use current-charge pump) is almost the same with the individual current-charge pump exposed to the radiation, there are still some coupled relationships exhibiting among modules. Also, the simulation results are qualitatively consistent with previous experiment phenomena; further, it is demonstrated that the voltage-charge pump technique can be used effectively to improve the TDR effect of the charge pump; lastly, the effect of global photocurrents on the rail span collapse is indirectly considered through power analysis. However, it is found that this effect can be negligible due to the very small variation of power.



中文翻译:

模拟延迟锁定环的瞬态剂量率效应的仿真研究

本文介绍了模拟延迟锁定环(DLL)的瞬态剂量率(TDR)效应。模拟DLL电路建立在先前的设计基础上,典型的光电流由Sentaurus TCAD计算得出。成功地引入了单双指数和双双指数函数,以随着模拟节点的变化来适应不同的光电流波形,然后将其集成到SPICE模型中,以用于以后的电路仿真。首先,分析各个子电路(例如电荷泵)的辐射效应及其耦合关系。仿真结果表明,电荷泵作为最敏感的模块会导致最大的时钟误差,其次是压控延迟线。尽管DLL(使用电流电荷泵)的总体辐射效应与暴露在辐射下的单个电流电荷泵几乎相同,但模块之间仍然存在一些耦合关系。而且,仿真结果与先前的实验现象在质量上是一致的。进一步证明,电压-电荷泵技术可以有效地用于提高电荷泵的TDR效果。最后,通过功率分析间接考虑了全局光电流对跨轨坍塌的影响。但是,发现由于功率的很小变化,这种影响可以忽略不计。仿真结果与先前的实验现象在质量上是一致的。进一步证明,电压-电荷泵技术可以有效地用于提高电荷泵的TDR效果。最后,通过功率分析间接考虑了全局光电流对跨轨坍塌的影响。但是,发现由于功率的很小变化,这种影响可以忽略不计。仿真结果与先前的实验现象在质量上是一致的。进一步证明,电压-电荷泵技术可以有效地用于提高电荷泵的TDR效果。最后,通过功率分析间接考虑了全局光电流对跨轨坍塌的影响。但是,发现由于功率的很小变化,这种影响可以忽略不计。

更新日期:2021-05-12
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