Oscillation Frequency Shift Caused by Temperature of Crystal Resonator and Its Solution
Crystal resonators are widely used components in electronic devices, which mainly produce highly stable oscillating signals. However, in practical applications, crystal resonators may exhibit abnormal frequency-temperature characteristics, which can seriously affect the performance and reliability of the device. This article will introduce the abnormal factors of oscillation frequency shift caused by crystal resonator temperature, and provide some solutions.
Excessive driving power is one of the main causes of abnormal frequency-temperature characteristics of crystal resonators. If the driving power exceeds the value specified in the crystal resonator specifications, the abnormal temperature characteristics of the oscillation frequency can be determined. This is called "jumping" or "excitation jumping". Since excessive driving power may cause this phenomenon, it is necessary to reduce the driving power to avoid excitation jumping.
In addition to excessive driving power, the abnormal characteristics of the crystal resonator itself may also cause abnormal frequency-temperature characteristics. If the characteristics of the crystal resonator do not meet the specifications, its frequency-temperature characteristics may be distorted. Therefore, when selecting a crystal resonator, it is necessary to pay attention to its specifications and conduct sufficient testing and validation.
Furthermore, the temperature characteristics of the oscillation circuit components may also affect the frequency-temperature characteristics of the crystal resonator. To solve this problem, the following measures can be taken:
1. Increase the damping resistor: Increasing the damping resistor can reduce the output amplitude of the inverting amplifier, thereby reducing the actual driving power. By adjusting in this way, the oscillation amplitude will also be reduced. Therefore, it is best to check whether the oscillation margin exceeds five times. In addition, it is necessary to pay attention that the oscillation amplitude should not become too small.
2. Reduce the external load capacitance: Reducing the external load capacitance can increase the impedance of the oscillation circuit, thereby reducing the actual driving power. As a result, since the load capacitance is reduced, the actual oscillation frequency will increase. Therefore, it is best to check whether the actual oscillation frequency is within the desired frequency range.
In summary, the abnormal factors of oscillation frequency shift caused by crystal resonator temperature is a problem that needs attention. By taking appropriate measures, this problem can be effectively solved, and the performance and reliability of the device can be improved.
Watt Smith
Collaborator & Editor
Hello! My name is Watt Smith working on Chipdatas. I write and share relevant articles on electronic components category.
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