A reverse bias does just as the name suggests reversing the flow of the current through the diode. When the current through the junction increases the diffusion capacitance also increases.
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Reverse Bias
The forward bias decreases the resistance of the diode whereas the reversed bias increases the resistance of the diode.
Forward bias diode definition. 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. In forward biasing the current is easily flowing through the circuit whereas reverse bias does not allow the current to flow through it. Thus if an external voltage greater than and opposite to the built in voltage is applied a current will flow and the diode is said to be turned on as it has been given an external forward bias.
It the capacitance of the diode in forward biased condition and it is defined as the ratio of transiting charge created to the differential change in voltage. Under no voltage or unbiased condition the p n junction diode does not allow the electric current. Bias is the application of a voltage across a pn junction.
Voltage required to maintain current flow in a bipolar transistor or diode or to enhance current flow in a field effect transistor. Forward and reverse biasing describe the ways in which current flows through p n junctions. The forward bias and the reverse bias properties of the pn junction imply that it can be used as a diode.
Along with this increase in current the forward biased resistance also decreases. In forward bias operation the diode act like a closed switch. Forward bias the dc.
In forward biased p n junction diode the positive terminal of the battery is connected to the p type semiconductor material and the negative terminal of the battery is connected to the n type semiconductor material. Forward bias is in the direction of easy current flow and reverse bias is in the direction of little or no current flow. The diode is commonly said to have a forward threshold voltage above which it conducts and below which conduction stops.
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