Biasing of P-N junction diode

Hi  friends we are back once again with a new concept in this electronics.Actually in our last post we gave introduction to electronics and P-N junction diode. Today's post is about biasing of PN-junction diode.

Biasing of P-N junction diode:

• As we discussed earlier that  P-N junction represents two blocks of semiconductor materials , one p-type and one n- type material. On the formation of P-N junction some of the holes from p-type material tend to diffuse across the boundary into n-type material and some of the free electrons similarly diffuse into p-type material.
• A P-N junction diode is connected to an external voltage source, it is called biasing P-N junction diode.
• Biasing is used to control the width of depletion layer 

There are two types of biasing:

• 1)Forward bias
• 2)Reverse bias

1)Forward bias:

In forward bias P-type is connected to positive terminal and N-type is connected to negative terminal of the battery.

When voltage is applied across a diode in such a way that the diode allows current, the diode is said to be forward-biased

• When we apply the external voltage in such a way that it cancels the potential barrier and permits the current to flow. 
• By application of small voltage it is sufficient to eliminate the barrier so the width of the diffusion layer decreases and becomes zero(0) and junction is formed and holes takes place.

2)Reverse bias:

In reverse bias P-type is connected to negative terminal and N-type is connected to positive terminal of the battery.

"When voltage is applied across a diode in such a way that the diode prohibits current, the diode is said to be reverse-biased. "

• When we apply the external voltage in such a way that it increases the potential barrier width and prohibits the current to flow through them.
• Due to minority charges small current flows in reverse bias which is know as reverse saturation current.

This is all about biasing of P-N junction diode.  In our next chapter we will discuss more deeply about characteristics and types of diodes so please stay tuned for more updates and more over thanks for visiting us please follow and share to maximum extent for better people to stay in..