The following measures can be taken to effectively improve the anti-interference ability of crystal oscillators:

The interference experienced by crystal oscillators mainly includes electromagnetic interference, radio frequency interference, and power supply noise. Electromagnetic interference is caused by radiation or noise generated by external electromagnetic fields or other devices, which may lead to abnormal operation of crystal oscillators or signal distortion. Radio frequency interference is mainly caused by radio frequency signals generated by wireless communication devices, radars, Wi Fi routers, mobile phones, etc., which enter the crystal oscillator circuit through radiation or coupling, affecting its normal oscillation and frequency output. Power supply noise is generated by the instability of the power supply or interference from other devices, and is conducted into the crystal oscillator circuit through the power supply line, affecting the stable frequency output of the crystal oscillator.

To enhance the anti-interference ability of crystal oscillators, the following measures can be taken:

1.Choosing the appropriate crystal oscillator model: low phase noise (KJ series), low electromagnetic interference (KM series), and low radio frequency interference crystal oscillators are key to improving anti-interference ability. These crystal oscillator models have lower phase noise and electromagnetic interference, which can better resist external interference.

2.Using crystal filters: Crystal filters can effectively suppress high-frequency noise and reduce the impact of interference on crystal oscillators. By selecting an appropriate filter, interference signals can be filtered out and the frequency stability of the crystal oscillator can be improved.

3.Using a metal shielding shell: The metal shielding shell can prevent electromagnetic radiation from entering the crystal oscillator circuit and improve anti-interference performance. By encapsulating the crystal oscillator in a metal casing, the impact of external electromagnetic interference on the crystal oscillator can be reduced.

4.Optimizing circuit design: A reasonable PCB layout can effectively reduce interference coupling and minimize the impact of external signals on the crystal oscillator. Try to minimize long leads and high-frequency noise paths to avoid signal reflection and interference. By optimizing circuit design, the impact of interference on crystal oscillators can be reduced, and their frequency stability can be improved.

5.Decoupling and voltage stabilization: Add decoupling capacitors to the power input to reduce power fluctuations and noise interference. Simultaneously using a voltage regulator circuit to ensure stable power supply to the crystal oscillator and avoid voltage fluctuations affecting its frequency stability. By decoupling and stabilizing measures, the impact of power supply noise on the crystal oscillator can be reduced, and its frequency stability can be improved.

6.Application software anti-interference technology: further reducing the impact of noise interference through digital filtering algorithms. Digital processing of collected signals, software filters can eliminate external interference, improve signal purity and stability. By applying software anti-interference technology, the impact of interference on the crystal oscillator can be further reduced, and its frequency stability can be improved.

In summary, the anti-interference technology of crystal oscillators is crucial for ensuring their frequency stability. By selecting the appropriate crystal oscillator model, using crystal filters, adopting metal shielding shells, optimizing circuit design, decoupling and voltage stabilization, and applying software anti-interference technology, it is possible to effectively resist the effects of electromagnetic interference, radio frequency interference, and power supply noise, and improve the frequency stability of the crystal oscillator.