THEORY ::: RC-coupled Amplifiers

          One way to connect various stages of a multistage amplifier is via capacitors, as indicated in the two-stage amplifier in Fig.1 where two stages of common emitter amplifiers are coupled to each other by the capacitor C₃.

                                                   A typical configuration of an RC-coupled amplifier


In RC-coupled amplifiers:

• The various stages are DC isolated. This feature facilitates the biasing of individual stages.
• The various stages can be similar. Hence the design of the amplifier is simplified.
• The coupling capacitors influence the responses of the amplifier.
• A great number of biasing resistors is necessary. 

Circuit Diagram :

 Circuit Diagram of RC coupled amplifer