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Explain need for cascading of amplifiers.

Mumbai University > Electronics Engineering > Sem 4 > Discrete Electronic Circuits

Marks: 5M

Year: May 2015

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  • Cascading amplifiers are used to increase signal strength in Television receiver.

  • In cascading amplifier output of first stage is connected to input of second stage. A single stage amplifier is not sufficient to build a practical electronic system.

  • Although the gain of amplifier depends on device parameters and circuit components, there exists upper limit for gain to be obtained from single stage amplifier. Hence, the gain of single stage amplifier is not sufficient in practical application.

  • To overcome this problem, we need to cascade two or more stage of amplifier to increase overall voltage gain of amplifier. When more than one stages used in succession it is know as multi-stage amplifier.

  • The disadvantage is bandwidth decrease as number of stages increases.

enter image description here

Figure 1: Circuit diagram of multistage amplifier

enter image description here Figure 2: Frequency response comparison

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