Crystal drive level is the amount of power dissipated in a crystal. It can be calculated by measuring the excitation current flowing
through the crystal blank. It can affect, among others, the motional resistance, resonance frequency and phase-noise of the
crystal. As the excitation current through the crystal increases, the drive level and the amplitude of crystals vibration also
increase, causing changes in both the resistance and frequency.
A simple analysis in sweeping the drive level can be performed to verify changes in both resistance and frequency of the crystal.
This analysis, typically called Drive Level Dependence (DLD), can be taken using a Saunders & Associates (S&A) 250B/C
desktop network analyzer. See the solution below and refer to application note AN-801 for more details. For other questions not addressed by the Knowledge base, please submit a technical support request.