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How to Deal if the Crystal Oscillator does not Oscillate?

by: Aug 22,2023 2569 Views 0 Comments Posted in Help Center

crystal oscillator

The crystal oscillator is a commonly used clock source in electronic equipment, which is often used to provide a stable clock signal. However, sometimes the crystal oscillator may encounter a problem of not oscillating, causing the device to fail to work normally. Then how should we judge the reason why the crystal oscillator does not oscillate and solve it in time?

Why does the crystal oscillator not "oscillate"?

1. Damaged or inferior crystal oscillators: Inferior crystal oscillators may have manufacturing defects, resulting in instability. Therefore, it is first necessary to confirm whether the purchased crystal oscillators are reliable.

2. Connection Error: Incorrect crystal oscillator pin connections, excessively long lines, or loose connections may affect the oscillation of the crystal oscillator.

3. Environmental interference: Strong electromagnetic fields, radio frequency interference and other interference environments may affect the oscillation of the crystal oscillator.

4. Unstable power supply voltage: If the power supply voltage is unstable, it is likely to affect the oscillation of the crystal oscillator.

How to Solve the Problem?

1. Check the Crystal Oscillator Connection

Ensure that the pins of the crystal oscillator are correctly connected and the connection lines are short and secure. You can use an oscilloscope to monitor the waveform at the crystal oscillator pins.

2. Replace with a High-Quality Crystal Oscillator

Select a reputable, certified brand of crystal oscillator, and avoid using low-quality ones.

3. Shielding and Isolation

When designing the circuit, it is necessary to consider the environmental interference factors and take shielding measures or isolate the crystal oscillator circuit to reduce external interference.

4. Stable Power Supply

Ensure the stability of the power supply voltage. Power management devices such as voltage regulators can be used to maintain a stable power supply.

5. Add Load Capacitance

Adding a suitable load capacitor between the pins of the crystal oscillator can help improve the start-up and stability.

6. Adjust the Peripheral Circuit

Adjust the circuits around the crystal oscillator according to the crystal oscillator manufacturer's recommendation, such as capacitors, resistors, etc., to ensure proper start-up conditions and oscillation stability.

7. Oscilloscope Test

Use an oscilloscope to monitor the oscillation waveform of the crystal oscillator pin to identify whether there is any abnormality.

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