Multistage amplifiers
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Generally the voltage or current gain obtainable from a single stage transistor amplifier is insufficient for most applications. Hence several such stages are connected in cascade, i.e. output of the first stage is connected to form input of second stage,whose output becomes input of third stage, and so on. Such multistage amplifiers provide desired voltage or current gain.
Here, total gain is the product of the gains of the individual stages: Gain (A) = A1 X A2 X A3 X A4 X ... An.
Alternately, if the gain of each amplifier stage is expressed in decibels (dB), the total gain is the sum of the gains of the individual stages: Gain in dB (A) = A1 + A2 + A3 + A4 + ... An
According the components used for coupling (tying-in) the stages, following types of multistage amplifiers are found -
- R-C coupled amplifier
- L-C coupled amplifier
- Transformer coupled amplifier
- Direct coupled amplifier
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