semi said:Probably a really stupid question but for a pn diode in complete forward bias i.e 6volts (switch on 0.7volts), does it behave like a normal resistor or is it a squared resistance till say 200 volts and is there a forward voltage breakdown mechanism. I can only find I V curves that got to about 1.5 volts.
Forward bias in a PN diode refers to the application of a positive voltage to the P-type material and a negative voltage to the N-type material, thus creating a flow of current through the diode. This allows for the diode to conduct electricity and perform its intended function.
When a PN diode is forward biased, the depletion region (the area between the P and N layers) becomes thinner, allowing for an increased flow of current. This results in a decrease in resistance and allows for the diode to conduct electricity more efficiently.
The threshold voltage for forward bias in a PN diode is typically around 0.6 to 0.7 volts for silicon diodes and 0.2 to 0.3 volts for germanium diodes. This is the minimum voltage required for the diode to start conducting electricity.
Forward bias is commonly used in diodes for rectification, where alternating current is converted to direct current. It is also used in diode-based voltage regulators and in various electronic circuits for signal processing.
If a PN diode is forward biased with too high of a voltage, it can lead to excessive current flow and potentially damage the diode. This is known as "overforward biasing" and can cause the diode to overheat and fail. It is important to use the appropriate voltage for a diode's forward bias to prevent damage.