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With the help of a neat diagram explain the output characteristics of an NPN transistor in common emitter configuration.

Mumbai University > FE > Sem 1 > Basic Electrical and Electronics Engineering

Marks: 4 M

Year: May 2015

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Output characteristics

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  1. Cut-off region:- Both the emitter to base and collector to base junctions are reverse biased. The base current IB=0 and the collector current is equal to the reverse leakage current ICEO.

  2. Active region:- The emitter to base junction is forward biased and the collector to base junction is reverse biased. The collector current IC increases slightly with increase in voltage VCE However the collector current is largely depend on the base current IB.

  3. Saturation region:- The emitter to base junction and the collector to base junction are forward biased.

output resistance,r0=ΔVCEIC|IB=Constant|

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