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Homework Help: How does zener diode maintains constant voltage ?

  1. Aug 28, 2012 #1
    hello friends ,
    In zener diode due to high doping ,electric field is very intense .So this electric fields knocks electrons from atoms and reverse current starts flowing during reverse biasing.

    its said that at the same time it maintains constant voltage . Of which voltage we are talking about ?
    is this is the voltage around junction due to reverse bias ????
    Last edited by a moderator: Aug 28, 2012
  2. jcsd
  3. Aug 28, 2012 #2


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    Staff: Mentor

    Yes, it is the reverse bias voltage. Look up "avalanche breakdow", and tell us what it has to do with the reverse breakdown voltage of a zener diode...
  4. Aug 28, 2012 #3


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    Science Advisor
    Homework Helper
    Gold Member

    Basically the resistance changes from high to low above a certain voltage. Remember that ideal voltage sources have low internal resistance.
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