Drive level dependence and origin of noise in ultra-stable piezoelectric crystal resonators

Under storage, a phenomenon known as drive level dependency (DLD) or drive level sensitivity (DLS) may appear that prevents the starting of oscillation. Limits of the best oscillators based on this type of piezoelectric materials are known. As well as we remind about various experimental set-ups, and measurement procedures used to obtain very low drive level motional parameters, we are interested in investigating different designs and topologies to ensure stable solutions. Understanding the problem of starting piezoelectric oscillators after a long storage period may help for settling optimized devices to understand origin of noise. We are not only interested in the description of phenomena from the point of view of electrical or optical schematization, but concretely in implementing solutions to resolve them and find lasting technological solutions.