A novel method to suppress vibration-induced phase noise of crystal oscillators

Abstract

A compensated polarization-effect tuning technique is used to suppress the mechanical vibration-induced phase noise of quartz crystal oscillators. Unlike the earlier approach, the tuning signal is filtered by a dynamic function that provides both varying magnitude and phase compensation of the nonlinear distortion of the accelerometer and the phase delay of the tuning mechanism thus improving noise cancellation. Laboratory tests demonstrate that vibration-induced phase noise of a crystal oscillator under mechanical vibration is significantly suppressed after using this approach.