Different Types of Amplifiers Explained | Class A, Class B, Class AB, Class C and Class D amplifier

*In this video, the different types of amplifiers such as class A, Class B, Class AB, Class C and Class D amplifiers are explained and how they are used in specific application is also explained.*

*Types of Amplifiers:*
_The amplifier types are defined based on their conduction angle, meaning for what duration of the input signal, the amplifier conducts._

Based on that there are total 5 types of Amplifiers.

_1) Class A Amplifier_
This type of Amplifier conducts for the entire duration of the input signal. (conduction angle – 360°)

Type A amplifier provides the best linearity among all types of amplifiers, but they have poor efficiency (max. 25 %).

That is why they are suitable as a first stage low voltage amplifier.

_2) Class B Amplifier_
This type of amplifier uses push-pull amplifier, and at any given time only one amplifier conducts. In this type of Amplifier, each amplifier conducts approximately for 180°.

This amplifier provides high efficiency (max. 78.5 %), but has cross-over distortion.

_3) Class AB Amplifier_
This type of Amplifier also uses push-pull amplifier configuration, but here the transistors are biased such that, they conducts for more than 180°. Therefore, unlike class B amplifier, it does not have cross-over distortion. This amplifier provides best of both class A and Class B amplifier (good efficiency and better linearity), and it is suitable as power amplifier in audio applications.

_4) Class C Amplifier_
This type of Amplifiers conducts for less than 180°. And since they have high non-linear distortion, they are not suitable as audio amplifier. But they are suitable as RF amplifier. Since this type of amplifiers are conducting for a brief duration (less than 180°), they provides good efficiency (around 80 % ).

_5) Class D Amplifier_
This type of amplifier are ON/OFF type of amplifier. Here the input signal is converted into PWM signal and then it is passed through the low-pass filter. After low-pass filter, the original signal (but amplified version) is recovered. This type of amplifier, provides highest efficiency (greater than 90 %) and suitable as an audio amplifier for battery operated devices.

*For more information about Pulse Width Modulation, check this video:*

*For more videos about the BJT and BJT amplifier, check this playlist:*

*For more videos about MOSFET and MOSFET amplifiers, check this playlist:*

Timestamps:
0:00 Introduction
1:23 Class A Amplifier
3:20 Class B Amplifier
7:11 Class AB Amplifier
8:57 Class C Amplifier
10:58 Class D Amplifier
13:00 summary

This video will be helpful to all the students of science and engineering in understanding the different types of amplifier such as Class A, Class B, Class AB, Class C and Class D amplifiers and how they are used in different applications.

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#classC_Amplifier

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