The modulational method of quartz crystal oscillator frequency stabilization

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. 45; no. 6; pp. 1476 - 1484
• Main Author: Shmaliy, Y.S.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.1998; Institute of Electrical and Electronics Engineers
• Subjects: Aging; Circuit synthesis; Electrical capacitance tomography; Equations; Exact sciences and technology; Frequency control; Measurements common to several branches of physics and astronomy; Metrology, measurements and laboratory procedures; Oscillators; Ovens; Physics; Stress; Temperature dependence; Thermodynamics; Time and frequency; Frequency shift; Stabilization; Signal processing; Aging; Standard; Crystal oscillators; Crystal resonators
• ISSN: 0885-3010
• DOI: 10.1109/58.738287

A new trend in self-contained (without the use of quantum discriminators) frequency stabilization of an oven controlled crystal oscillator (OCXO) and frequency standard is proposed and discussed. The method developing the trend is called a modulational method and is based on the use of the reference properties of crystal resonator natural bulk vibrations (double-frequency and multi-frequency oscillators are not used in this case). The concept is based on dynamic modulation characteristics of an oscillator, and basic relationships are found for their calculation. The construction principles of the frequency control systems are formulated substantiating mathematically the essence of the method. Basic ratios of modulating signals are determined, the solution of which shows only a slight influence of the modulation signal on the Allan variance and spectral density of an OCXO. The results of the method's practical use are considered. Their subject is the OCXO with the oven system adapted to the ambient temperature and crystal frequency standard with aging rate compensation.