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- Capacitance of P-N Junction Diode Notes for Electronics Engineering 1st Year
- Transition And Diffusion Capacitance
- Transition Capacitance
Capacitance of P-N Junction Diode Notes for Electronics Engineering 1st Year
In this tutorial, we will learn about some of the important Diode Characteristics. By examining these Diode Characteristics, you will have a better understanding of the working of a Diode in general. Some of the frequently used diode characteristics are given below. Now, we will see a little bit more about these diode characteristics in brief. PN junction diode is widely known for passing the electric current solely in one direction. The amount of current flowing through the PN junction diode greatly depends on the type of material used and also depends on the concentration of doping in the fabrication of PN diode. The main reason for the flow of current is due to the generation or recombination of majority charge carriers in the structure of the PN junction diode.
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Transition And Diffusion Capacitance
P-N junction diode is the most fundamental and the simplest electronics device. When one side of an intrinsic semiconductor is doped with acceptor i. Any variation of the charge within a p-n diode with an applied voltage variation yields a capacitance which must be added to the circuit model of a p-n diode. The capacitance associated with the charge variation in the depletion layer is called the junction capacitance, while the capacitance associated with the excess carriers in the quasi-neutral region is called the diffusion capacitance. Expressions for the capacitances are obtained by calculating the change in charge for a change in applied voltage, or:.
The transition capacitance represents the change in charge stored in the depletion region with respect to a change in junction voltage. The increase in the level of reverse bias caused the width of the depletion region, W to increase. An increase in the width of the depletion region, W is accompanied by additional uncovered ions in the space charge or transition region. Because positive ions exist on one side of the junction and negative ions on the other, the transition capacitance, CT is analogous to a parallel plate capacitor for which we have. For a step graded junction, the width of the depletion region, W is inversely proportional to the square root of the reverse bias voltage.
Recall that the basic equation for the capacitance of a parallel-plate capacitor is defined by C =εA/d, where ε is the permittivity of the dielectric (insulator) between.
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 particular moment there is necessarily some charge in the process of transit through the device. If the applied voltage changes to a different value and the current changes to a different value, a different amount of charge will be in transit in the new circumstances. The change in the amount of transiting charge divided by the change in the voltage causing it is the diffusion capacitance.
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In a p-n junction diode , two types of capacitance take place. They are,. We know that capacitors store electric charge in the form of electric field. The conducting plates or electrodes of the capacitor are good conductors of electricity. Therefore, they easily allow electric current through them. On the other hand, dielectric material or medium is poor conductor of electricity.
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