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Related Experiment Videos

Predicting phase noise in crystal oscillators.

Fabrice Sthal1, Serge Galliou, Nicolas Gufflet

  • 1Department Laboratoire de Chronométrie Electronique et Piezoelectricité, Ecole Nationale Supérieure de Mécanique et des Microtechniques 6174, 25000 Besançon, France. fsthal@ens2m.fr

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|March 8, 2005
PubMed
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An enhanced model predicts crystal oscillator phase noise by calculating power spectral densities from correlation functions, accounting for resonator and amplifier noise. Experimental validation with 10 MHz quartz crystal oscillators confirms the model's accuracy.

Area of Science:

  • Electrical Engineering
  • Physics

Background:

  • Phase noise is a critical parameter in crystal oscillators, affecting signal integrity.
  • Existing models may not fully capture noise contributions from different oscillator components.
  • Accurate phase noise prediction is essential for designing high-performance electronic systems.

Purpose of the Study:

  • To develop and validate an enhanced phase-noise model for crystal oscillators.
  • To distinguish and quantify noise contributions from resonators and amplifiers.
  • To enable accurate prediction of phase noise power spectral densities within the oscillator loop.

Main Methods:

  • Developed an enhanced phase-noise model calculating power spectral densities from correlation functions.
  • Incorporated resonator-caused and amplifier-caused noise sources.

Related Experiment Videos

  • Validated the model using a batch of 10 MHz quartz crystal oscillators from facility production.
  • Performed open-loop and closed-loop measurements for comparison.

    • Main Results:

    • The enhanced model successfully computes power spectral densities of phase fluctuations at various points in the oscillator loop.
    • Distinguished contributions of resonator and amplifier noise to overall phase noise.
    • Experimental results from 10 MHz quartz crystal oscillators closely matched theoretical predictions.
    • Demonstrated the model's capability in analyzing oscillators with specific resonator characteristics (frequency, motional resistance).

    Conclusions:

    • The enhanced phase-noise model provides accurate predictions for crystal oscillator phase noise.
    • The model effectively separates and quantifies noise sources, aiding in oscillator design and optimization.
    • Experimental validation confirms the model's utility for analyzing production-level crystal oscillators.