Which of the following oscillator can be used, where high stability of frequency is required?

Crystal Oscillator:

A crystal oscillator is the most stable frequency oscillator.

Advantages:

• The crystal oscillator is possible to obtain a very high precise and stable frequency of oscillators
• It has very-low-frequency drift due to change in temperature and other parameters
• The Q is very high
• It has automatic amplitude control

Disadvantages:

• These are suitable for high-frequency application
• Crystals of low fundamental frequencies are not easily available

• Hartley and Colpitts's oscillators are LC oscillators.
• LC oscillators are unstable oscillators.
• Phase shift oscillator is suitable for oscillations in AF range up to 1 kHz
• Crystals like quartz have high-quality factors, Q (range: 104 - 106). The high-quality factor will result in high-frequency stability.