Abstract: Aircraft frequency synthesizer is an important part of the vehicle, and its performance directly determines the quality of the whole system. As the core part of the frequency synthesizer, the crystal oscillator is sensitive to vibration or impact force which will cause the frequency jitter and phase noise degradation. After having analyzed the pierce oscillator circuit which is the most commonly used in a crystal oscillator, this paper establishes the test circuit, and obtains the pierce circuit’s pulse response. The tuning circuit based on variodes is also applied to the actual compensation circuit. The experimental results show that it achieves a good compensation effect when the vibration frequency is less than 100Hz.

Key words: Variodes, Acceleration compensation, Tunning, Oscillation circuit