What are the two main types of junction capacitance in a PN-junction diode, based on
charge storage?
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A.
Diffusion capacitance and transition capacitance
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B.
Conduction capacitance and breakdown capacitance
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C.
Stray capacitance and conduction capacitance
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D.
Stray capacitance and leakage capacitance
Correct Answer:
A. Diffusion capacitance and transition capacitance
Explanation:
A PN-junction diode exhibits two primary forms of junction capacitance: transition capacitance and diffusion capacitance. Transition capacitance, also known as depletion or barrier capacitance, occurs when the diode is reverse-biased; the depletion region acts as a dielectric between the conducting P and N layers, similar to a parallel-plate capacitor. Diffusion capacitance, or storage capacitance, becomes dominant under forward-bias conditions and results from the accumulation of minority charge carriers near the edges of the depletion region before they recombine. Therefore, these two types are distinguished by the specific biasing conditions and the nature of the charge storage involved.
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