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The failure mechanism stimulated by accelerated stress in the degradation may be different from that under normal conditions, which would lead to invalid accelerated life tests. To solve the problem, we study the re- lation between the Arrhenius equation and the lognormal distribution in the degradation process. Two relationships of the lognormal distribution parameters must be satisfied in the conclusion of the unaltered failure mechanism, the first is that the logarithmic standard deviations must be equivalent at different temperature levels, and the second is that the ratio of the differences between logarithmic means must be equal to the ratio of the differences between reciprocals of temperature. The logarithm of distribution lines must simultaneously have the same slope and regular interval lines. We studied the degradation of thick-film resistors in MCM by accelerated stress at four temperature levels (390, 400, 410 and 420 K), and the result agreed well with our method. 相似文献
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文章在研究分析了集成电路中功耗的主要来源以及温度对集成电路性能的影响后,详细总结了近年来集成电路芯片级的几种热分析方法。并从实际应用角度对这几种方法进行了分析和比较,讨论了各个方法的优点及其适用范围。 相似文献
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AlGaN/GaN高电子迁移率晶体管(HEMT)器件在实际应用过程中经常受到由于振动、热胀冷缩等原因引起的动态应力.为了研究动态应力对器件性能带来的影响,利用自主设计的应力机械装置对AlGaN/GaN HEMT芯片持续施加峰值大小为150 MPa,频率为3 Hz的交变应力.施加应力过程中,每隔一定的应力周期对器件进行电学特性测量,得到了不同应力周期下的输出特性曲线和转移特性曲线.研究分析了随着应力周期的增加输出电流和跨导的变化,研究结果表明,器件的输出电流和跨导随着施加动态应力周期的增加而减小.随着动态应力的加载,器件将产生缺陷,是器件发生退化的原因. 相似文献
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InP 层对正面及背面入光 PIN 探测器响应度影响研究 总被引:2,自引:0,他引:2
InP盖层对光的吸收及入射光在探测器多界面间的多次反射,使InP层对InGaAs/InPPIN探测器的响应度产生了很大的影响。本文测量了正面和背面入光PIN探测器的响应度,并与测量的InP晶片透射率及模拟的透射率进行比较,分析了InP层对正面及背面入光PIN探测器响应度的影响。结果表明,随着InP层厚度的增加,响应度峰与峰的间隔Δλ不断减小,波形越来越密集。所以正面入光探测器的响应度起伏比较明显,且随着InP层厚度的增加,响应度极值对应的波长发生红移。背面入光探测器的响应度非常密集而成为准连续的带状。 相似文献
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