Influence of resonator factors on phase-noise of OCXOs

The paper is devoted to study of physical causes of phase-noise of crystal oscillators associated with the crystal technology. It was found that this source contributes into the phase-noise though instability of the quartz - electrodes transition (QET) modulating the crystal parameters. A model linking the oscillator frequency fluctuations with instability of QET, equivalent parameters of the crystal, and some regimes of the sustaining circuitry was proposed and confirmed experimentally. Basing on this approach some ways of phase-noise reduction were proposed and discussed in the paper.