What is Diffusion capacitance?
Capacitance in a forward-biased PN junction caused by injected minority carriers stored in the neutral regions. It grows in proportion to forward current and limits high-speed operation.
Field: PN junctions and diodes
Diffusion capacitance in the explanations
Under forward bias, minority carriers are injected and stored on both sides of the junction, and because their amount changes with voltage they behave as a capacitance—the diffusion capacitance.
In a forward-biased PN junction, which capacitance arises f…
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Related terms
Forward bias Junction capacitance (depletion capacitance) Avalanche breakdown Built-in potential Conductivity modulation Depletion layer Ideality factor Ohmic contact Reverse recovery time Schottky barrier diode