Initial Results on 5 Mhz Quartz Oscillators Equipped With BVA Resonators

Raymond J. Besson, Donald A. Emmons

Abstract:	The techniques of fabricating BVA resonators have yielded greatly improved performance in terms of aging, amplitude-frequency effect, and acceleration sensitivity. Preliminary results have been recently obtained including factor of 3.5 x 100. short-term stability of 5 x 10-15 at 1 second and aging of 5 x 10-12 per day measured at NBS. In addition, the frequency shift under acceleration (measured at ONERA) was found to be as low as 2 x 10-10 per g for AT-cut quartz, and a factor of 10 smaller for SC-cut, with no residual frequency shift after static 8 loading, to within a few 10-11. In this paper are presented new results on 5 MHz resonators concerning aging versus drive level, reduced amplitude-frequency effect, frequency and phase stability performance, and frequency retrace following power interruption. The conclusion from aging and level of drive investigations is that a zero aging rate is possible at a drive level which depends on the quartz material used. For natural AT quartz, a level of 70 to 90 W appears to be optimum, and for SC quartz approximately 160 W. Measurements of short term frequency stability and of the phase noise were performed using crystals mounted within a modified commercial oscillator model, FTS 1000.
Published in:	Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting November 27 - 29, 1979 Goddard Space Flight Center Greenbelt, Maryland
Pages:	457 - 469
Cite this article:	Besson, Raymond J., Emmons, Donald A., "Initial Results on 5 Mhz Quartz Oscillators Equipped With BVA Resonators," Proceedings of the 11th Annual Precise Time and Time Interval Systems and Applications Meeting, Greenbelt, Maryland, November 1979, pp. 457-469.
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