Diode Reverse Biased

This external bias voltage is designated as v bias just as it was for forwarding bias. In forward bias operation the diode act like a closed switch.

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For a diode with the characteristics in fig.

Diode reverse biased. P n junction during forward bias offers low impedance path whereas during reverse bias acts as an insulator. Negative charges electrons can easily flow through the junction from n to p but not from p to n and the reverse is true for holes. In reverse biased p n junction diode the free electrons begin their journey at the negative terminal whereas holes begin their journey at the positive terminal.

The voltage dropped across a conducting forward biased diode is called the forward voltage. It is the product of the forward current and the forward voltage. When voltage is applied across a diode in such a way that the diode prohibits current the diode is said to be reverse biased.

The p n junction diode during the reverse bias is highly sensitive to the light so that it can be used in photodiode application. In figure a dc voltage is a source connected across a diode in the direction to produce reverse bias. Maximum power dissipation p.

A pn junction diode allows electric charges to flow in one direction but not in the opposite direction. Hence p n junction diode can be used as a rectifier. Peak reverse voltage vr.

Forward voltage for a diode varies only slightly for changes in forward current and temperature. This process is known as rectification. 2 4 the reverse current is typically less than 110000 of the lowest normal forward current level.

Over this reverse voltage diode will go for breakdown due to its minority carriers. Reverse bias is the condition that essentially prevents current through the diode. Free electrons which begin their journey at the negative terminal find large number of holes at the p type semiconductor and fill them with electrons.

Therefore i r is quite negligible when compared to i f and a reverse biased diode may be treated almost as an open switch. The forward bias and the reverse bias properties of the pn junction imply that it can be used as a diode. It is the maximum reverse voltage across the diode at it reverse biased condition.

A diode is forward biased if the p type pin is connected with the anode of a voltage source and n type of the diode is connected with the cathode of the source.

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Diode Parameters Peak Inverse Voltage Maximum Forward