脉宽调制器单粒子效应测试系统研制

Development of Measurement System for Single Event Effect on Pulse Width Modulator

摘要: 本文在分析脉宽调制器(PWM)单粒子效应主要失效模式的基础上，研制了具备频率异常测试、占空比异常测试和参考电压测试功能的PWM单粒子效应测试系统，并在中国原子能科学研究院HI-13串列加速器上开展了单粒子效应试验。试验结果表明：单粒子效应会导致PWM输出信号的脉冲丢失和占空比改变，脉冲丢失时间和占空比改变的持续时间有时可达数ms；UC1825AJ型PWM的单粒子效应LET阈值约为4.4 MeV•cm²•mg^-1，UC1845AJ型PWM的抗单粒子性能受工艺批次的影响较大。

Abstract: An online measurement system for single event effect on pulse width modulator (PWM) was developed, which can test the frequency, duty cycle and reference voltage. The single event effect experiment of PWM using the system was carried out on the HI-13 tandem accelerator in China Institute of Atomic Energy. The results show that single event effect can cause errors in frequency and duty cycle, and the errors may last several milliseconds sometimes. The LET threshold of single event effect for UC1825AJ is about 4.4 MeV•cm²•mg^-1. The radiation-tolerant ability of single event effect for UC1845AJ PWM depends on the date codes.