# (a) Differentiate between three segments of an n-p-n transistor on the basis of their size and level of doping.(b) Draw a plot of transfer characteristic and show which portion of the characteristic is used in amplification and why.

(a) The three segments of n-p-n transistor are ;

• Emitter            Base             and             Collector

Difference between these on the basis of their size and level of doping ;

 1. Emitter 2. Base 3. Collector The emitter is a moderate size The base is a very thin The collector size is slightly more than the emitter region It is a heavily doped semiconductor.  its size is more than base but less than the collector Its doping intensity is less than emitter and collector The collector terminal is moderately doped.

(b) Plotting of graph ;

In the above graph, the active region of the transfer characteristics is used for the amplification purpose. This is because in this region $I_{C}$ increases almost linearly with the increase of $V_{i}$.

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