Static and Dynamic Frequency - Temperature Characteristics of Quartz Vibrators.
Abstract
The frequency-temperature (f-t) behavior of a crystal resonator depends upon temperature, and its spatial and temporal gradients. For quasi-isothermal changes, the static f-t curve can be used to determine frequency shifts that occur. The frequency then depends upon the parameters of the static f-t curve, the temperature range over which the oven cycles, and upon the oven setting point. The maximum frequency excursion has been computed for the AT and SC cuts of quartz in terms of these parameters, as function of orientation angle. When oven cyclings, or other temperature perturbations occur at rates too rapid to be considered quasi-isothermal, additional non-negligible components of frequency shift are introduced. This effect is quantified by means of a simple model which is capable of predicting thermal transient effects for AT cuts. Simulations, using the model, disclose that sinusoidal temperature variations with periods of hours can lead to frequency instabilities much larger than would be expected using the static f-t curve. This effect should be greatly diminished in the vicinity of the SC cut. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1979
- Accession Number
- ADA068630
Entities
People
- Arthur D. Ballato
Organizations
- United States Army Communications-Electronics Command