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kingrosekhan123

Apr 14, 2013
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what is the difference between forward biasing and reverse biasing.
what will be result if we replace both with each other in circuit...

thanks.
 
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Laplace

Apr 4, 2010
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The biasing determines at what point on the characteristic operating curve the diode will work. The result of reversal could be a change in polarity (for a rectifier circuit) to faulty operation of the circuit or possibly even self-destruction. However, if you also reversed the power supply voltage, PNP & NPN devices, N-channel & P-channel devices, and polarized capacitors, then you might be able to make the circuit operate in the reversed condition. However, it would be difficult to reverse integrated circuits.
 

davenn

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Sep 5, 2009
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when forward biased the diode conducts normally at anything over its forward voltage drop, typically ~ 0.7V

reversed biased ... the diode doesnt conduct till its breakdown voltage is exceeded
this is usually a bad thing. But its used to an advantage with zener diodes that have predetermined reverse bias breakdown voltages

Dave
 

kingrosekhan123

Apr 14, 2013
19
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Apr 14, 2013
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for reverse biased,we use zener diode???

breakdown voltage is "rapidly increase of current under reverse bias"..???

am i right??
 

garyson02

May 2, 2013
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In Forward Bias of P-N Junction, the p-type is connected with the positive terminal of the battery and the n-type is connected with the negative terminal of the battery. The holes of positive region and electrons of negative region move toward the P-N junction depend upon polarity of applied voltage. It reduce the width of Depletion layer. Current flow is permitted.
In Reverse Bias of P-N junction, the p-type is connected with the negative terminal of the battery and the n-type is connected with the negative terminal of the battery. It increase the width of Depletion layer.Current flow is prohibited until it reach the zener or avalanche breakdown.
 
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