Q.Explain the working of n-p-n transistor in common base configuration.
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In the common-base (CB) configuration of an n-p-n transistor, the base is the common terminal to both input (emitter) and output (collector) circuits.
Biasing: The emitter-base junction is forward biased (input circuit) and the collector-base junction is reverse biased (output circuit).
Working: Forward bias at E-B lowers the barrier there, so a large number of majority-carrier electrons from the (heavily doped) n-emitter are injected into the thin, lightly-doped p-base. Because the base is very thin and lightly doped, only a small fraction of these electrons recombine with base holes (constituting the small base current ); the vast majority diffuse across the base and are swept into the collector by the strong reverse-bias field at the C-B junction, constituting the collector current .
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