What is Oscillator? Types, Working, Advantages & Applications

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An oscillator is an important electronic circuit used in many devices like radios, televisions, and communication systems. It is used to generate continuous signals without requiring any external input signal. Oscillators are widely used in electronics to produce waveforms such as sine waves, square waves, and triangular waves.

Definition

An oscillator is an electronic circuit that converts DC (direct current) into AC (alternating current) signals without any external input signal.

The working of an oscillator is based on positive feedback.

Step-by-step working:

• The circuit is supplied with DC power.
• A part of the output signal is fed back to the input.
• This feedback is in phase with the input signal (positive feedback).
• Due to continuous feedback, the circuit starts generating oscillations.
• The output becomes a continuous AC signal.

Types of Oscillator

1. RC Oscillator - Read More 
2. LC Oscillator
3. Crystal Oscillator
4. Relaxation Oscillator

Advantages

1. No external input signal required
2. Simple design
3. Generates continuous signals
4. Used in many electronic circuits

Disadvantages

1. Noise can affect performance
2. Frequency stability may vary (except cfor the rystal oscillator)
3. Requires proper design for accuracy

Applications

1. Radio transmitters
2. Signal generators
3. Clocks and watches
4. Computers and microprocessors
5. Communication systems

Top 10 Viva Questions on Oscillator

1. What is an oscillator?

An oscillator is an electronic circuit that generates continuous AC signals from a DC supply without any external input.

 

2. What is the basic principle of an oscillator?

It works on the principle of positive feedback.

 

3. What is positive feedback?

It is a process where a part of the output signal is fed back to the input in the same phase.

 

4. Does an oscillator require an input signal?

No, it does not require any external input signal.

 

5. What are the main types of oscillators?

RC, LC, Crystal, and Relaxation oscillators.

 

6. Which oscillator is most stable?

Crystal oscillator.

7. What is the function of an oscillator?

To generate continuous electrical signals (waveforms).

8. What is the Barkhausen criterion?

For sustained oscillations:

Gain = 1

Phase shift = 0° or 360°

9. Where are oscillators used?

In communication systems, clocks, radios, and signal generators.

10. What type of waveform is generated by an oscillator?

Sine wave, square wave, or triangular wave.