A Research And Compensation Of Phase Difference Measurement Method Based On Related Endpoints Of Crystal Oscillator

The development of time-frequency measurement and control technology has been changing with each passing day and plays a very important role in many fields.With the explosion of the satellite navigation and information technology revolution,the improvement of the traditional technology to the crystal oscillation is not enough to meet the application in the high-end industry,and the search for new technology is imminent.A burst of new technology is likely to further sublimate the traditional technology.As a frequency standard,the stability of crystal oscillator performance has been the main objective of the research,so the improved method is also one of the ways in which people have been exploring.However,the change of resonant parameters leads to the instability of phase shift in the inductive state of resonator,which means that the change of phase shift is not paid much attention to.In this paper,the physical characteristics,working principle and aging characteristics of crystal resonator are analyzed.In the meantime,the change of resonant parameters which leads to an error in the LC resonance parameters of phase shift and an effect with Q value of the resonant circuit is analyzed.The necessity of measuring the signals at both ends of the resonator is discussed theoretically.Combined with phase coincidence detection and phase comparison method,the border effect is used to measure the phase more accurately.Although the signal at both ends of the resonator is the same frequency signal,Changes in the phase of the measured signal conforms to the requirement of phase coincidence detection.In the case of accurate frequency measurement,it can not only obtain continuous real-time phase information,but also can further improve the measurement accuracy when performs phase comparison under the same nominal value.In this paper,it introduces the characteristics of resonant parameters and the theoretical knowledge of fuzzy area and its border effect.Demonstrating the feasibility of the measurement by direct measurement,the real-time phase information of the both signals can be obtained by using the combination of phase coincidence detection and phase comparison method.Then,the data is processed and fitted by MATLAB.Choose the appropriate mathematical model to establish the frequency,phase,and the change of frequency with phase,verified and partially improved.The mathematical model is proved to have a good effect on the prediction of the model.Finally,the frequency drift caused by resonant parameters is compensated by a compensation method.The compensation results that the frequency drift caused by resonant parameters can be reduced by the change of phase difference.The proposed method can be integrated in the oscillator to generate a small module that compensates the changes caused by the resonant parameters and can make the crystal oscillator's output frequency more stable.