Experimental study on electromechanical performance decoupling and vibration suppression of crystal oscillator

Abstract

In the mechanical vibration environment, the phase noise of crystal oscillator would deteriorate sharply, which would lead to the decline of the stability of crystal oscillator and affect the comprehensive performance of the whole electronic equipment. In this paper, the mechanism of electromechanical coupling between mechanical vibration and phase noise is analysed theoretically. The relationship between phase noise and vibration magnitude and the sensitivity of phase noise to different vibration frequencies and directions are studied experimentally, then the decoupling of mechanical performance and electrical performance is realized. Based on this, a vibration isolator for crystal oscillator is designed, which can achieve 15-2000Hz full frequency band random vibration attenuation, the vibration acceleration RMS value is reduced by 95%, and the phase noise degradation of crystal oscillator is less than 5dB. The research has a certain reference value for the vibration isolation design of electromechanical coupling vibration sensitive devices.