Which of the following oscillators is the most stable one?

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ALP CBT 2 Electronic Mechanic Previous Paper: Held on 21 Jan 2019 Shift 1
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  1. RC phase shift oscillator
  2. Colpitt’s oscillator
  3. Crystal oscillator
  4. Hartley oscillator

Answer (Detailed Solution Below)

Option 3 : Crystal oscillator
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Detailed Solution

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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

26 June 1

  • 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: 10- 106). The high-quality factor will result in high-frequency stability.
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