Question

Explain the output characteristics of common emitter configuration of n-p-n transistor.

Answer 1

The variation of the collector current I_C with variation in the collector-emitter voltage is called the output characteristic of a transistor.

The base current I_B is constant at this time. From the curve we can see that the, collector current I_C is independent of V_CE as long as the collector-emitter junction is reverse biased.

Also, the collector current I_C is large for large values of the base current I_B when V_CE is constant.

The output dynamic resistance r_o of a transistor is defined as the ratio of the change in the collector-emitter voltage V_CE and the change in the collector current I_C for constant base current I_B.

`r_o=(DeltaV_(CE))/(DeltaI_C)`