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Wednesday, September 23, 2015

ZENER DIODE

ZENER DIODE

·         A Zener diode is a specially doped PN junction device to operate in reverse breakdown region.

Equivalent circuit of zener diode

Biasing of zener diode:

         Forward biasing                                                                                
Reverse biasing:
                                       








  • In forward biased condition the normal pn junction diode and zener diode operate in similar fashion.
  • In reverse biased condition, the zener diode carries reverse saturation current till the reverse voltage applied is less than the reverse break down voltage(V<Vz). When reverse voltage exceeds reverse breakdown voltage(V>Vz), the current through it changes drastically but voltage across it remains constant.such a breakdown region is called normal operating region of a zener diode.
  • The reverse voltage at which the breakdown occurs is called zener breakdown voltage(Vz).
VI characteristics of a Zener diode

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