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what is the need of multistage amplifier ?
Ans: Amplifier with a single stage may not provide sufficient gain for the application multistage amplifiers can be used.For example ,if we are employing two amplifiers in cascaded (multistage)
the total gain is, A = (A1)*(A2)
 A1 - gain of first stage
 A2 - gain of second stage.
             Some times multistage amplifiers are also used for getting impedance matching.


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