Electrical Engineering (EE) Exam > Electrical Engineering (EE) Questions > The capacitance of a p-n junction diode:a)Doe...
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The capacitance of a p-n junction diode:
- a)Does not change with the increase in the forward bias voltage
- b)Decrease with the increase in the forward bias voltage
- c)Increase exponentially with the increases in the forward bias voltage
- d)Increase linearly with the increase in the forward bias voltage
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The capacitance of a p-n junction diode:a)Does not change with the inc...
During forward Bias, the diffusion capacitance is the dominant capacitance.
τ = mean lifetime of minority carriers
If = forward current
As forward current Increase exponentially,
The junction capacitance increases exponentially on forward bias.
Most Upvoted Answer
The capacitance of a p-n junction diode:a)Does not change with the inc...
Understanding Capacitance in a P-N Junction Diode
The capacitance of a p-n junction diode is a crucial parameter that is influenced by the voltage applied across the junction. The behavior of this capacitance under forward bias is significant for various applications in electronics.
Forward Bias and Depletion Region
- When a p-n junction diode is forward-biased, the applied voltage reduces the width of the depletion region.
- As the depletion region narrows, more charge carriers (holes and electrons) are able to recombine, leading to an increase in capacitance.
Capacitance and Forward Bias Relationship
- The capacitance of the diode is related to the charge stored in the depletion region. As the forward bias voltage increases, the charge density increases.
- This results in a higher capacitance due to the effective area of the junction increasing as more charge carriers are available.
Exponential Increase in Capacitance
- The increase in capacitance with forward bias is not linear; it tends to be exponential.
- This is because the charge carrier injection into the depletion region increases rapidly as the voltage rises, leading to a significant change in capacitance.
Conclusion
Therefore, the correct answer is that the capacitance of a p-n junction diode increases exponentially with the increase in forward bias voltage. This characteristic is vital for understanding how diodes operate in various circuits, especially in high-frequency applications and signal processing.
The capacitance of a p-n junction diode is a crucial parameter that is influenced by the voltage applied across the junction. The behavior of this capacitance under forward bias is significant for various applications in electronics.
Forward Bias and Depletion Region
- When a p-n junction diode is forward-biased, the applied voltage reduces the width of the depletion region.
- As the depletion region narrows, more charge carriers (holes and electrons) are able to recombine, leading to an increase in capacitance.
Capacitance and Forward Bias Relationship
- The capacitance of the diode is related to the charge stored in the depletion region. As the forward bias voltage increases, the charge density increases.
- This results in a higher capacitance due to the effective area of the junction increasing as more charge carriers are available.
Exponential Increase in Capacitance
- The increase in capacitance with forward bias is not linear; it tends to be exponential.
- This is because the charge carrier injection into the depletion region increases rapidly as the voltage rises, leading to a significant change in capacitance.
Conclusion
Therefore, the correct answer is that the capacitance of a p-n junction diode increases exponentially with the increase in forward bias voltage. This characteristic is vital for understanding how diodes operate in various circuits, especially in high-frequency applications and signal processing.
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The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer?.
The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer? for Electrical Engineering (EE) 2025 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer?.
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The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of The capacitance of a p-n junction diode:a)Does not change with the increase in the forward bias voltageb)Decrease with the increase in the forward bias voltagec)Increase exponentially with the increases in the forward bias voltaged)Increase linearly with the increase in the forward bias voltageCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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