Classification Of Amplifiers Electrical Engineering (EE) Notes | EduRev

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Electrical Engineering (EE) : Classification Of Amplifiers Electrical Engineering (EE) Notes | EduRev

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CLASSIFICATION OF AMPLIFIERS:

A circuit that increases the amplitude of the given input signal is an amplifier.A small ac signal fed to the amplifier is obtained as a larger ac signal of the same frequency at the output. Amplifiers constitute an essential part of radio, television and other communication circuits. Depending on the nature and level of amplification and the impedance matching requirements, different types of amplifiers can be considered and they are discussed in this chapter.

Amplifiers can be classified as follows:

1.Based on the transistor configuration:

    (a) Common emitter amplifier

    (b) Common base amplifier

    (c ) Common emitter amplifier

2.Based on the active devices:

    (a) BJT amplifier

    (b) FET amplifier

3.Based on the Q-point(operating condition):

    (a)  Class A amplifier

    (b)  Class B amplifier

    (c)  Class C amplifier

    (d)  Class AB amplifier

4.Based on the number of stages:

    (a)  Single stage amplifiers

    (b) Multistage amplifiers

5.Based on the output:

    (a)Voltage amplifiers

    (b)Power amplifiers

6.Based on the frequency response:

   (a)Audio frequency(AF) amplifier

   (b)Intermediate Frequency amplifier(IF)

   (c )Radio Frequency amplifier(RF)

7.Based on the bandwidth:

  (a)Narrow band amplifier(normally RF amplifier)

  (b)Wide band amplifier(normally video amplifier)

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