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If CT is the transition capacitance, which of the following are true?
1) in forward bias, CT dominates
2) in reverse bias, CT dominates
3) in forward bias, diffusion capacitance dominates
4) in reverse bias, diffusion capacitance dominates
1) in forward bias, CT dominates
2) in reverse bias, CT dominates
3) in forward bias, diffusion capacitance dominates
4) in reverse bias, diffusion capacitance dominates
- a)1 only
- b)2only
- c)2 and 3
- d)3 only
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
If CTis the transition capacitance, which of the following are true?1)...
In reverse bias condition, depletion region increases and acts as an insulator or dielectric medium. So, the transition capacitance increases. In forward bias condition, due to stored charge of minority carriers, diffusion capacitance increases.
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If CTis the transition capacitance, which of the following are true?1)...
In a PN junction diode, there are two main types of capacitances that affect its operation: the transition capacitance (CT) and the diffusion capacitance (CD). The question asks us to determine which capacitance dominates under different bias conditions.
1) In forward bias, CT dominates:
- When a diode is in forward bias, the P-region is connected to the positive terminal of the battery, and the N-region is connected to the negative terminal. This causes the depletion region to narrow.
- The transition capacitance (CT) is primarily determined by the width of the depletion region. As the depletion region narrows in forward bias, the CT decreases.
- Therefore, in forward bias, CT dominates over CD because the narrowing of the depletion region reduces the transition capacitance.
2) In reverse bias, CD dominates:
- When a diode is in reverse bias, the P-region is connected to the negative terminal of the battery, and the N-region is connected to the positive terminal. This causes the depletion region to widen.
- The diffusion capacitance (CD) is primarily determined by the rate at which minority carriers (electrons in P-region and holes in N-region) diffuse across the depletion region. As the depletion region widens in reverse bias, the CD increases.
- Therefore, in reverse bias, CD dominates over CT because the widening of the depletion region increases the diffusion capacitance.
3) In forward bias, diffusion capacitance dominates:
- This statement is incorrect. In forward bias, the narrowing of the depletion region reduces the transition capacitance (CT), causing it to dominate over the diffusion capacitance (CD).
4) In reverse bias, diffusion capacitance dominates:
- This statement is correct. In reverse bias, the widening of the depletion region increases the diffusion capacitance (CD), causing it to dominate over the transition capacitance (CT).
Therefore, the correct answer is option 'C' because in forward bias, CT dominates, and in reverse bias, CD dominates.
1) In forward bias, CT dominates:
- When a diode is in forward bias, the P-region is connected to the positive terminal of the battery, and the N-region is connected to the negative terminal. This causes the depletion region to narrow.
- The transition capacitance (CT) is primarily determined by the width of the depletion region. As the depletion region narrows in forward bias, the CT decreases.
- Therefore, in forward bias, CT dominates over CD because the narrowing of the depletion region reduces the transition capacitance.
2) In reverse bias, CD dominates:
- When a diode is in reverse bias, the P-region is connected to the negative terminal of the battery, and the N-region is connected to the positive terminal. This causes the depletion region to widen.
- The diffusion capacitance (CD) is primarily determined by the rate at which minority carriers (electrons in P-region and holes in N-region) diffuse across the depletion region. As the depletion region widens in reverse bias, the CD increases.
- Therefore, in reverse bias, CD dominates over CT because the widening of the depletion region increases the diffusion capacitance.
3) In forward bias, diffusion capacitance dominates:
- This statement is incorrect. In forward bias, the narrowing of the depletion region reduces the transition capacitance (CT), causing it to dominate over the diffusion capacitance (CD).
4) In reverse bias, diffusion capacitance dominates:
- This statement is correct. In reverse bias, the widening of the depletion region increases the diffusion capacitance (CD), causing it to dominate over the transition capacitance (CT).
Therefore, the correct answer is option 'C' because in forward bias, CT dominates, and in reverse bias, CD dominates.
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If CTis the transition capacitance, which of the following are true?1) in forward bias, CTdominates2) in reverse bias, CTdominates3) in forward bias, diffusion capacitance dominates4) in reverse bias, diffusion capacitance dominatesa)1 onlyb)2onlyc)2 and 3d)3 onlyCorrect answer is option 'C'. Can you explain this answer?
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