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An experimental study of frequency jumps during the aging of quartzoscillators

机译：石英振荡器老化过程中跳频的实验研究

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摘要

The cause of abrupt frequency jumps observed during the aging ofnhigh-stability quartz oscillators is investigated. For this purpose anprecise method of measuring the resonant frequency versus drive currentnis used, and this method is applied to AT-cut crystal resonators used innoven controlled crystal oscillators (OCXOs). Experimental results shownthat there are some cases where the resonance frequency jumps whenncrystal current is changed; this phenomenon originates with spuriousnresonances near the fundamental mode, and the current that causesncoupling between the spurious and fundamental modes shifts according toncrystal driving time. Furthermore, we show that the abrupt jumping innlong-term frequency observation is caused by a “shift” ofnthe current that causes the couplings
机译：研究了在高稳定性石英振荡器老化过程中观察到的突然跳频的原因。为此目的，一种精确的测量谐振频率与所用驱动电流的方法，并且该方法适用于创新型可控晶体振荡器（OCXO）所使用的AT切割晶体谐振器。实验结果表明，在某些情况下，改变晶体电流会引起谐振频率的跃迁。这种现象是由基本模式附近的寄生谐振引起的，并且导致寄生模式和基本模式之间的耦合的电流会随晶体的驱动时间而变化。此外，我们表明，长期频率突变的突然跳跃是由电流的“偏移”引起的，该电流引起耦合

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