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Discussion in 'General Electronics Discussion' started by kingrosekhan123, May 1, 2013.

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  1. kingrosekhan123

    kingrosekhan123

    19
    0
    Apr 14, 2013
    what is the difference between forward biasing and reverse biasing.
    what will be result if we replace both with each other in circuit...

    thanks.
     
    Last edited by a moderator: May 1, 2013
  2. Laplace

    Laplace

    1,252
    184
    Apr 4, 2010
    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.
     
  3. davenn

    davenn Moderator

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    1,950
    Sep 5, 2009
    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
     
  4. kingrosekhan123

    kingrosekhan123

    19
    0
    Apr 14, 2013
    for reverse biased,we use zener diode???

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

    am i right??
     
  5. garyson02

    garyson02

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    0
    May 2, 2013
    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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