Why is it that for biasing a transistor its reverse bias voltage have to be larger than the forward biased voltage?

Asked by divyakhare | 13th Feb, 2012, 07:17: PM

Expert Answer:

for transistors,say for example npn:
as emitter- base jn is forward biased, the electrons from  n section moves towards p jn.   n jn is highly doped, large number of electrons flow towards p jn and as p jn is lightly doped,only 5 % of the electrons get trecombined. so as collector jn is connected to positive terminal, the electrons will be driven towards positive of Vcb,and a small portion towards positive terminal of Vbe.
so that is why current Ic is generated and current flows in all the loops and through the junction. this is the reason the amplification al;so occurs.

Answered by  | 14th Feb, 2012, 10:03: AM

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