(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 ;
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 increases almost linearly with the increase of .