冲击载荷下石英晶体振荡器失效机理分析

Failure Mechanism Analysis of Quartz Crystal Oscillators under Impact Load

石英晶体振荡器通常作为电子信息处理系统的时间或频率基准源。在较高冲击环境下,晶振经常会出现输出信号频率改变,导致系统工作异常,冲击消失后其性能又恢复。针对冲击载荷对石英晶体振荡器性能失效的影响,以常见石英晶体振荡器结构为研究对象,通过建立其动力学响应模型,结合力-电等效转换特性,定性分析了冲击载荷下晶振性能失效机理。通过锤击实验,验证了分析结果。结果表明,当冲击载荷使晶振片结构产生大变形时,石英晶振等效电容和等效电阻随冲击载荷变大而变大,导致晶振输出信号频率变大,晶振会出现性能失效;较小冲击时,晶振片产生的变形较小,频率变化可忽略不计,表现出高稳定性。

Quartz crystal oscillator is usually used as a time or frequency reference source of the electronic information processing system. The crystal oscillator would fail under high impact load environment,then leading to the abnormal working of a system. In order to analyze the failure mechanism of quartz crystal oscillator due to the effect of impulsive load on its frequency,the common structure of crystal oscillator is chosen as the research object. A dynamic response model is established,and the failure mechanism of crystal oscillator is qualitatively analyzed based on force and electric equivalent conversion characteristics. the analysis results are verified through the hamming experiment. The result shows that the equivalent capacitance and equivalent resistance of quartz crystal oscillator increase with the increase in impact load when a large deformation is caused by impact load,thus resulting in its performance failure; when the deformation of quartz crystal oscillator is small under smaller impact load,the frequency of crystal oscillator is negligible.