Low‐drive level characteristics of at‐cut resonators with cylindrical capsules

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書誌事項

公開日
1996-01
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1002/ecjb.4420790305
公開者
Wiley

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<jats:title>Abstract</jats:title><jats:p>As a quartz resonator needed for miniaturizing electronic devices, a rectangular AT‐cut quartz resonator sealed in a cylindrical capsule has been developed and manufactured. It was found that the anomalous characteristics of the resonator at a low‐drive level have something to prevent starting oscillation. The drive level characteristics of the rectangular AT‐cut quartz resonator sealed in a cylindrical capsule have not been clarified to date. These characteristics are obtained from the low‐drive level to the high‐drive level. Among these characteristics, the anomalous phenomena at the low‐drive level (LDL) have been studied experimentally and theoretically. It was found that the anomalous phenomena are caused by the unwanted vibration of the structure other than the resonator plate itself. The frequency of the unwanted vibration depends strongly on the drive level. At the drive level that makes the frequency identical to that of the main resonance, an anomaly occurs in which the frequency and CI jump substantially. The manner of this jump can be calculated by assuming that the unwanted vibration is proportional to the current squared and the coefficient is large. The analysis shows a good agreement with the experimental result. In regard to the unwanted vibration found in the present experiment, it is assumed that the coefficient dependent on the square of the current of the unwanted vibration is negative and that the unwanted vibration is significantly originated in the structures attached to the quartz plate (such as electrodes, support member, mounting material, and dust).</jats:p>

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