Crystal Oscillator Explained

In this video, the working and design of the crystal oscillator have been explained.

By watching this video, you will learn the following topics:

0:21 why crystal oscillator is used in certain applications

1:58 Working principle of crystal and different piezo-electric materials

4:05 The equivalent circuit of crystal and discussion on series and parallel resonant frequencies in the crystal

8:38 Crystal oscillator design using series resonance of the crystal

9:30 Colpitts oscillator using crystal

10:20 Pierce Oscillator using crystal

14:12 Things to consider while selecting crystal for crystal oscillator / for a particular application

Crystal Oscillator:

The crystal oscillators are used in applications where a very stable frequency is required.

In LC and RC oscillators, the oscillator frequency changes due to change in temperature, power supply voltage or even slight change in the component values.

In the well-designed crystal oscillator, the change in the frequency is minimum with the change in different parameters.

The crystal oscillator provides very good selectivity (due to very high Q- Quality Factor)

Working of Crystal OScillator:

The crystal oscillator works on the principle of inverse piezo-electric effect.

In the video, the principle has been explained and the different materials which are often used as crystal have been discussed briefly.
The quartz is most commonly used material for the crystal design.

The equivalent circuit of the crystal:

The crystal can be represented as the RLC circuit in the electrical equivalent circuit. And it has two resonant frequencies

1) The Series Resonant Frequency (fs)

2) The Parallel Resonant Frequency (fp)

This RLC circuit provides the frequent selectivity for the oscillation and when this crystal is used with the amplifier, it can be used as an oscillator.

In the video, different crystal oscillator circuits have been discussed and in the end, the different factors which needs to be considered while selecting the crystal have been discussed.

This video will be helpful to all the students of science and engineering in understanding the working principle and design of crystal oscillator.

The link for the other useful videos on Oscillator and Multivibrators:

How Oscillator Works
   • How Oscillator Works ? The Working Pr...  

RC Phase Shift Oscillator
   • Wien Bridge Oscillator (using op-amp)...  

Wien Bridge Oscillator
   • Wien Bridge Oscillator (using op-amp)...  

What is Multivibrator?
   • What is Multivibrator ? Astable, Mono...  

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