Definition Of Diffusion Capacitance

The term efficacy is by definition a measure of the ability of a device to produce a desired effect.

Definition of diffusion capacitance. Diffusing capacity dĭ fuz ing the rate at which a gas diffuses across the alveolocapillary membrane per unit difference in the partial pressure of the gas across the membrane expressed in ml min mm hg. For the led this is the ratio of the number of lumens generated per applied watt of electrical energy. The depletion layer capacitance per unit area has a pretty straightforward explanation that the opposite edges of the depletion layer have charge buildup on them and thus form a parallel plate capacitor. Diffusion capacitance is directly proportional to the electric current or applied voltage.

Because of their high affinity for hemoglobin both oxygen and carbon monoxide are limited in their rate of diffusion by their diffusing capacity. C d may have value of a few thousand of pf. Diffusion capacitance occurs in a forward biased p n junction diode. Diffusion capacitance is the capacitance due to transport of charge carriers between two terminals of a device for example the diffusion of carriers from anode to cathode in forward bias mode of a diode or from emitter to base forward biased junction in active region for a transistor in a semiconductor device with a current flowing through it for example an ongoing transport of charge by.

Diffusion capacitance often comes up in transistor design. Normally the capacitance c includes the floating diffusion capacitance and the output amplifier mesfet gate capacitance. Transition and diffusion capacitance. The transition capacitance can be mathematically written as c t ε a w.

Where ε permittivity of the semiconductor. A area of plates or p type and n type regions. It is one of the two main capacitances you see the other being the depletion layer capacitance. Design optimization and modeling of high speed gaas charge coupled devices the forward biased laser diode is modeled as a junction resistance r sub d in parallel with a diffusion capacitance c sub d.

If large electric current flows through the diode a large amount of charge is accumulated near the depletion layer. W width of depletion region. Diffusion capacitance is the capacitance due to transport of charge carriers between two terminals of a device for example the diffusion of carriers from anode to cathode in forward bias mode of a diode or from emitter to baseforward biased junction for a transistor in a semiconductor device with a current flowing through it for example an ongoing transport of charge by diffusion at a. Diffusion capacitance c d.

In the similar way if small electric current flows through the diode only a small.