Question:
A reverse biased zener diode when operated in the breakdown region works as
A reverse biased zener diode when operated in the breakdown region works as
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Zener Diode Behavior
- Forward bias: acts like normal diode.
- Reverse bias (below $V_Z$): blocks current.
- Reverse bias (above $V_Z$): conducts and maintains constant voltage.
- Used in voltage clamping and regulation.
Updated On: May 20, 2025
- an amplifier
- an oscillator
- a voltage regulator
- a rectifier
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The Correct Option is C
Approach Solution - 1
A Zener diode allows reverse current flow once the reverse voltage exceeds a critical breakdown value ($V_Z$). In this region:
- Voltage across the diode remains constant.
- Current can vary widely without changing the voltage.
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Approach Solution -2
Step 1: Understand the operation of a zener diode
A zener diode is designed to operate in the reverse-biased condition. When the reverse voltage applied across it reaches a certain value called the breakdown voltage (or zener voltage), it starts conducting current without damage.
Step 2: Breakdown region and its significance
In the breakdown region, the zener diode maintains a nearly constant voltage across its terminals despite changes in the current flowing through it. This unique property is used in regulating voltage.
Step 3: Function of a zener diode in breakdown region
When connected in reverse bias and operated in the breakdown region, the zener diode stabilizes the voltage to a fixed value (the breakdown voltage). If the input voltage varies, the diode adjusts the current through it to keep the output voltage stable.
Step 4: Application as a voltage regulator
Because the zener diode maintains a constant voltage over a wide range of current, it is commonly used as a voltage regulator in electronic circuits. It ensures sensitive components receive a stable voltage supply.
Step 5: Conclusion
Therefore, a reverse biased zener diode operating in the breakdown region functions as a voltage regulator, making the correct answer option (a) voltage regulator.
A zener diode is designed to operate in the reverse-biased condition. When the reverse voltage applied across it reaches a certain value called the breakdown voltage (or zener voltage), it starts conducting current without damage.
Step 2: Breakdown region and its significance
In the breakdown region, the zener diode maintains a nearly constant voltage across its terminals despite changes in the current flowing through it. This unique property is used in regulating voltage.
Step 3: Function of a zener diode in breakdown region
When connected in reverse bias and operated in the breakdown region, the zener diode stabilizes the voltage to a fixed value (the breakdown voltage). If the input voltage varies, the diode adjusts the current through it to keep the output voltage stable.
Step 4: Application as a voltage regulator
Because the zener diode maintains a constant voltage over a wide range of current, it is commonly used as a voltage regulator in electronic circuits. It ensures sensitive components receive a stable voltage supply.
Step 5: Conclusion
Therefore, a reverse biased zener diode operating in the breakdown region functions as a voltage regulator, making the correct answer option (a) voltage regulator.
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