Advantages of CE Transistor Configuration

Advantages of CE Transistor Configuration

( 1 ) High current gain

• The collector current in the CE configuration is given by

        I_C =  βI_B + I_CBO

Where

I_C = Collector current

I_B = Base current and

I_CBO = Collector – base leakage current when emitter is open

β = Current amplification factor

   = I_C / I_B

• The value of β is very high therefore the collector current is also more than the input base current. 
• The current amplification factor is very high in the CE configuration.
•  Its range is from 20 to 500.

( 2 ) High voltage and high power gain

• The voltage gain and power gain of the CE configuration is very high due to high current gain. That is why CE configuration is mostly used.

( 3 ) Moderate output to input impedance ratio

• The ratio of output impedance to input impedance is very small in the case of CE configuration. 
• This makes it is suitable for coupling between two stages of the transistor. 
• If the ratio of output impedance to input impedance is very large, the coupling between output stage of first amplifier and input stage of second amplifier is not effective.

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