Question
Draw the circuit diagram of a common emitter amplifier with appropriate biasing. What is the phase difference between the input and output signals? State two reasons why a common emitter amplifier is preferred to a common base amplifier.
Solution
The circuit diagram of a common-emitter amplifier is given below: 
In a CE amplifier, the phase difference between the input and output signals is 180o.
Common emitter amplifier is preferred over common base amplifier because the current gain in CE amplifier is very high.
In CB amplifier the current gain is less than 1.
