What is an Amplifier & Its Types?

In this tutorial, we are going to learn about an Amplifier & Its Types.


It is an electronic amplifier which is an electronic device that can increase the power of a signal (a time-varying voltage or current).

Most electronic systems require at least one stage of amplification. Hence amplifiers can be seen in almost all electronic devices. The amplifier is the device that increases the amplitude of the input signal. The output of the power supply is modulated by the amplifier. The amplifier increases only the amplitude and the other parameters such as frequency and shape remain constant.

Types of Amplifier

There are 3 types of Amplifiers

Voltage Amplifier

These are the most common amplifier used in electronic devices. These amplifiers increase the amplitude of the output voltage of the signal.

Current Amplifier

These amplifiers increase the amplitude of the input current compared to the input current waveform.

Power Amplifier

The purpose of the power amplifiers is to increase the power i.e. the product of the output voltage and current is greater than the product of the input voltage and current. Either the voltage or current at the output may be less than the input. When an AC signal is applied to the amplifier, only a part of it is amplified.

Classified of Power Amplifier

  1. Class A
  2. Class B
  3. Class AB
  4. Class C

Amplifiers can be further classified based on the signal they amplify

  1. Audio Frequency Amplifiers (A.F.)
  2. Intermediate Frequency Amplifiers (I.F. Amplifiers)
  3. Radio Frequency Amplifiers (R.F. Amplifiers)  
  4. Ultrasonic Amplifiers (U. F.)
  5. Wideband Amplifiers (W.F.)
  6.  Direct Coupled Amplifiers (DC Amplifiers)
  7. Video Amplifiers
  8. Buffer Amplifiers
  9. Operational Amplifiers
  10. Transistor Amplifiers

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