Physics – Instrumentation and Detectors
Scientific paper
2007-06-13
Proceedings of the IEEE Frequency Control Symposium & European Time and Frequency Forum (01/06/2007) NA
Physics
Instrumentation and Detectors
Scientific paper
High-stability quartz oscillators are needed in a number of space applications. A short-term stability of parts in 10^{-14} [Allan deviation \sigma y(\tau) ] is sometimes required, for integration time \tau of approximately 1-10 s. The Centre National d'Etudes Spatiales (CNES) and the FEMTO-ST Institute (formerly LPMO and LCEP), have been collaborating for many years in this domain, aiming at measuring and at understanding the oscillator noise. The highest stability has been observed on 5 MHz and 10 MHz bulk acoustic-wave resonators. Yet this stability is still not sufficient, or the the manufacturing method is not reproducible. Recently, the analysis of a few premium-stability oscillators has demonstrated that the oscillator frequency instability is due to the fluctuation of the resonator natural frequency, rather than to the noise of the sustaining amplifier via the Leeson effect. It is therefore natural to give attention to the measurement of the resonator fluctuations.
Cibiel Gilles
Galliou Serge
Rubiola Enrico
Salzenstein Patrice
Sthal Fabrice
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