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Question
Why is zener diode reverse biased?
Why is zener diode reverse biased?
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Solution
- A zener diode is a semiconductor that exhibits the property to conduct current in either forward direction or reverse direction.
- When the semiconductor device, in this case, a zener diode, is connected to the supply in opposite polarities, it is called reverse bias.
- Since a reverse-biased zener Diode exhibits a controlled breakdown, it is used mostly in reverse-biased conditions. It can also act as a voltage stabilizer in this condition.
- These diodes are reverse-biased only because they conduct a constant amount of current until the reverse voltage attains a value that is equal to the breakdown voltage.
- At the breakdown voltage, the diodes show two types of breakdowns: Avalanche Breakdown and Zener Breakdown.
The following figure shows the properties of a zener diode:
- A zener diode is a semiconductor that exhibits the property to conduct current in either forward direction or reverse direction.
- When the semiconductor device, in this case, a zener diode, is connected to the supply in opposite polarities, it is called reverse bias.
- Since a reverse-biased zener Diode exhibits a controlled breakdown, it is used mostly in reverse-biased conditions. It can also act as a voltage stabilizer in this condition.
- These diodes are reverse-biased only because they conduct a constant amount of current until the reverse voltage attains a value that is equal to the breakdown voltage.
- At the breakdown voltage, the diodes show two types of breakdowns: Avalanche Breakdown and Zener Breakdown.
The following figure shows the properties of a zener diode:
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