Hint: We know that the current that flows in reverse bias PN junction diode is called reverse saturation current. From the diode current equation I=Is(eVηVT−1) the current should decrease as the temperature is increased but the opposite happens.
How do you find reverse saturation current?
Hint: We know that the current that flows in reverse bias PN junction diode is called reverse saturation current. From the diode current equation I=Is(eVηVT−1) the current should decrease as the temperature is increased but the opposite happens.
What is the reverse saturation current?
The reverse saturation current is the part of the reverse current in a semiconductor diode which is caused by the diffusion of minority carriers from the neutral regions to the depletion region.
How do you calculate current diode?
- The diode equation gives an expression for the current through a diode as a function of voltage. ...
- Where,
- I = the net current flowing through the diode.
- I 0 = Reverse Saturation Current.
- V = applied voltage across the terminals of the diode.
- q = absolute value of electron charge.
How is reverse current obtained?
In a PN junction diode, the reverse saturation current is due to the diffusive flow of minority electrons from the p-side to the n-side and the minority holes from the n-side to the p-side . it is a current which is produced due to the small reverse voltage when pn junction diode is reverse biased.
What is the reverse current of a diode?
Hence, it is also called reverse saturation current . The term is particularly applicable to mostly semiconductor junctions, especially diodes and thyristors. Reverse leakage current is also known as “zero gate voltage-drain current” with MOSFETs. The leakage current increased with temperature.
What is the saturation current in a diode?
The saturation current is a combination of the generation current caused by thermal generation of electron hole pairs within the depletion region of the diode and the diffusion current due to minority carriers in the n and pregions diffusing across the depletion region.
Why zener diode is used in reverse bias?
Zener diode is a heavily doped diode. ... When the Zener diode is reverse biased the junction potential increases . As the breakdown voltage is high this will provide high voltage handling capacity. As the reverse voltage is increased, the reverse current increases drastically at a certain reverse voltage.
Why does a saturation current occur?
When the voltage is increased up to a certain level, every electron that gets released is able to reach the other electrode, but as the number of electrons getting released is constant , current too becomes constant (saturation current) and no further increase in voltage will cause increase in current.
What is reverse breakdown?
What It Is: Reverse breakdown voltage is the reverse anode voltage at which the diode conducts a specified amount of reverse current . Since it’s the reverse current across a junction, IR exhibits a knee shaped rise, increasing rapidly once breakdown occurs.
What is the diode symbol?
Diode, an electrical component that allows the flow of current in only one direction. In circuit diagrams, a diode is represented by a triangle with a line across one vertex .
What is Zener diode and its applications?
Zener diodes are used for voltage regulation , as reference elements, surge suppressors, and in switching applications and clipper circuits. The load voltage equals breakdown voltage VZ of the diode. The series resistor limits the current through the diode and drops the excess voltage when the diode is conducting.
What is reverse current in transistor?
Reverse Current When ON
In an NPN transistor, the Base is at a positive bias, the Collector at a negative bias, and reverse current flows from the Emitter to the Collector . ... Therefore, C and E can be used as a transistor, even when connected in reverse. In this case current will flow from E to C. 3.
Why does reverse current occur?
Reversed current occurs when there is a higher voltage at the output of a system than the input , causing the current to flow back through the system. ... At the same time, the positive voltage will draw the electrons to the battery and will reject the holes. This will cause the current to flow into the circuit.
What is quiescent operating point?
Q point or the operating point of a device, also known as a bias point, or quiescent point is the steady-state DC voltage or current at a specified terminal of an active device such as a diode or transistor with no input signal applied .
