Low phase noise quartz surface acoustic wave oscillators acceleration and barometric sensitivity optimization

An analysis of the frequency sensitivity of various SAWR (surface acoustic wave resonator) structures to atmospheric pressure and vibration stresses is presented. The barometric sensitivity appears to be more stringent than the acceleration sensitivity. It is shown that, for a wide range of aspect ratio and package structure, a support shape which cancels sensitivity to the acceleration in one direction may be found. The optimization of both pressure and vibration sensitivity may not be easily obtained through such geometrical adjustment. The result is that a tradeoff must be found to optimize both acceleration and pressure sensitivity. Possible resonator configurations are discussed with regard to simultaneous pressure and acceleration sensitivity optimization