Omega Piezo Technologies (United States)

The in situ technique has been validated with theory and demonstrated by experiment. This powerful technique may now be used to investigate both component and parametric behavior in quartz oscillators. Such issues as drive level dependency and short term frequency pops may be better understood through the technique. Aging models, particularly those involved with prediction, will benefit from the separation of crystal resonator from circuitry.

Abstract : A number of commercially available instruments have been evaluated for use in precision quartz crystal resonator measurement. Since no single system is best for all the commonly required measurements, emphasis has been placed on basic performance factors so that users can judge the suitability of each system for a particular type of measurement. Comparative room temperature measurements of a range of crystal resonators, resistors, and capacitors are reported.

The experimental and theoretical behavior of surface acoustic wave (SAW) resonators on ST-cut Quartz is described. Because of their zero temperature characteristic and good Q (typically 10,000), ST-cut quartz resonators are of poten- tial interest for narrow-band filtering applications in the VHF-UHF ranges.

This letter reports an experimental investigation in which the use of acoustical coupling between thickness-shear resonators to obtain a monolithic crystal filter with bandpass characteristics is extended to the VHF region and overtone operation. Attenuation curves for a 112-MHz fifth-overtone filter with a bandwidth of 14 kHz are given, showing good stopband performance over the 10 to 300 MHz range of measurement.

This letter comments on discrepancies among the theoretical results reported by several groups investigating extensions to the theory of trapping in AT-cut quartz resonators.