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How to prevent the bad phenomenon of crystal vibration?

Release date:2020-04-20

How to prevent the occurrence of bad crystal vibration phenomenon, now huiyuan jinggong electronics company requires you to answer the question, and to the crystal vibration element leak detection test, in order to check its tightness, the details are as follows:


1. The sealing process is to package the tuned resonator with the housing to stabilize the electrical performance of the quartz resonator. During this process, the feed bin, pressure seal bin and discharge bin shall be kept clean. The pressure seal box should be flushed continuously. During the pressure seal process, pay attention to welding head wear, mold position, voltage, air pressure and flow. Its quality standard is: no scar, burr, top pit, bent leg, brand symmetry without skew.


2, because the quartz crystal is a passive element, it is provided by IC appropriate excitation power and can work normally, so, when the excitation power is too low, the quartz crystal is not easy to start vibration, too high, will form extreme; The quartz chip is damaged, causing the vibration to stop. Therefore, appropriate excitation power should be provided. In addition, the active power load will consume a certain amount of power, so as to reduce the crystal's Q value, so as to make the crystal's stability decline, vulnerable to the influence of the surrounding active elements, in an unstable state, vibration phenomenon occurs. Therefore, when the active power load is increased, it should be matched with a more appropriate active power load.


3. Control the cutting and welding process to ensure the insulation performance of the base and the quality of the inserting needle. The inserting needle coating is bright and uniform, and the surface is free from hemp, deformation, cracks, discoloration, scratches, stains and peeling of the coating. To better prevent a single leak, an insulating spacer can be placed below the crystal.


4. When the crystal produces frequency drift and exceeds the frequency difference range, it should be checked whether the appropriate load capacitance is matched, which can be solved by adjusting the load capacitance of the crystal.