Diode Characteristics and Parameters
Learn about the static characteristics of diodes, including bulk resistance, junction resistance, dynamic resistance, and reverse resistance. Explore how these parameters affect the behavior of diodes in both forward and reverse bias scenarios.
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Presentation Transcript
The volt-ampere characteristics described recently are called static characteristics static characteristics B Because ecause They describe the d.c d.c. behavior of the diode
The forward and reverse characteristics have been combined into a single diagram as shown below:
1- Bulk It is the sum of the resistance values of the P- and N- type semiconductor materials of which the diode made of. Bulk resistance (r rB B) rB= rP+ rN
Usually, it is very small, and given by: rB= Where: VB is barrier potential It is the resistance offered by the diode well above the barrier voltage i.e when current is large. Obviously, this resistance is offered in the forward direction.
2-Junction resistance (rjor rd) It is also known as incremental particularly in connection with small signal operations of the diode. incremental resistance resistance and is an important parameter Its value for forward-bias junction depends on the magnitude of forward dc current.
