Zener–Diode
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Description:
Zener diode is P-N junction diode. It is used for regulation of voltage supplied.
It is highly doped and used in reverse biasing.
Zener diode is designed to operate in breakdown region.
When reverse bias reaches a particular value, the current increases suddenly. This voltage is called Zener breakdown voltage or simply Zener voltage (VZ).
Breakdown for a given Zener diode depends upon doping level of P and N regions. Generally, this value is small, such as 1.5V, 2V.
It is clear from characteristic that, in breakdown region, voltage across Zener diode remains almost constant even when current through it changes by large amount.
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