Study On The High Reliability Of The Clock Source In The Condition Of High Over-loaded Station

As the key part of many electrical equipments, quartz oscillator is widely used in communication、radar、navigation and measuring instrument, etc. It has a vivid name-"heart" of electronic devices,In fact, based on the complexity of environment such as the variety of temperature and vibration, etc, which is called by a joined name—high overload condition, the quartz oscillator is less stable than the normal situation. Recently, with the improvement of the performance of various electronic equipments, the requirement of against high overload is more and more urgent. Then, the study of against high overload is becoming more and more popular.In order to guarantee the stability and reliability of quartz oscillator in the condition of high overload situation. So far, there’s many works are carried out. In general, the methods can be classified as passive and active methods, which are mainly work in the quartz oscillator itself and they are complicated and difficult.According to the situation, the thesis puts forward a new method, which chose silicon oscillator, which uses the complementary characteristics of quartz oscillator, in order to realize the purpose of resisting to the high overload situation. Firstly, we test several parameters of silicon oscillator through experiments again and again. Then on the basis of acquiring the parameters of silicon oscillator accurately, we design a circuit of phase detector. Lastly, we calibrate the coefficient of silicon oscillator output frequency in order to be more and more close to the real value of the next sampling frequency need. Then we should tackle with the data of the phase detector output though the modules of data acquisition data processing. When all of the above work is completed, we can realize the purpose of working stably in the condition of high overload before the crystal frequency drift and convert quickly to avoid the influence of electronic devices working normally which is made by the quartz oscillator.