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Q...
Its Gourab
Diode
General diodes are made up of Si gerally and we operate this diodes generally in forward bias while Zener diode in the reverse bias . Is there any difference in the construction of this two diode i.e. I want 2 say why we use Zener diode only in the forward bias ?
ans:
we use zener in reverse bais only
nd yes construction of both diodes r same besides dopping level used for p-n material differs(heavilly dopped as concern to zener)
by sutably controling the amount of impurities & making p-n junc free from surface imperfection,the vtg at which breakdown takes place can b made to occur very distinctly&sharply
Once zener has broken down,very small change in vtg.across diode results change in current flowing thr it,so used as reff vtg.or in regulator ckts.too
Zener effect is only found in diodes th breakdown below ab6V in revere bais.
in this region diplection region is very narrrow.........
b-coz of exremely narrow deplection region there exists a high electric field across the junc. this elect.field provides a high elect.force which is responsible for tearing electrons out of the covalent bond directly rather th collision.This is the true ZENER effect so this is how it has to work in reverse bais only
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