It is a semiconductor device that converts the sinusoidal signal into uni-direction. In other words, It can also be said that Diode is a semiconductor device that allows the current only in one side and blocks the current in another side.
Diode works on two mode operation
- Forward Biased Mode (FBM)
- Reverse Biased Mode (RBM)
Biasing means to apply the dc voltage to diode. It is well known that diode made by PN-junctions. So, when p-type connected with DC positive (+) terminal and n-type connected with DC negative (-) terminal, then Diode said to be in forward biased mode. In this mode, current flows from zero to maximum rating of diode (1N4007). Figure 1 illustrating the connection of diode for forward biased mode operation.
Figure 2 illustrating the waveform result of diode for forward biased mode. As potential barrier for Si diode is 0.7V. When supplied dc voltage increased from 0.7 V, then current starts to flow in forward direction. This can be understood more clearly from figure 2.
When p-type connected with DC negative (-) terminal and n-type connected with DC positive (+) terminal, then Diode said to be in reverse biased mode. In this mode, there is no current to flow. Figure 3 illustrating the connection of diode for forward biased mode operation.
Figure 4 illustrating the waveform result of diode for reverse biased mode. In this mode, no current is flowing except leakage current. There is a point known as break-down voltage. If voltage exceeds from this point then device will be burn out or damaged and abrupt current will flow through the device.
To understand the characteristics of Diode. Following steps are performed:
- Create the project in PSpice by clicking on New Project icon. Performed the following steps then
- Select the project name
- Select the location where to save the file.
- Also PSpice Analog or Mixed A/D should be checked
- The illustration of creating new project shown in below figures step by step
After that select “Create a blank project” and then pressed OK
A blank window will be open look like in below figure. Here is draw the circuit by placing components from library as shown.
The drawn circuit will be look like in below figure
Now Create a new simulation profile by clicking on the icon as shown in below and save it by any desired name.
Select the DC sweep analysis from analysis type. Give the name that is given to your source. Also select the start and end value with the increment.
Run the simulation by pressing the run button. A window will be pop up like below in figure. Change the value of x-axis by double click on x-axis, then click on axis variable and select the V(VD1).
Now go to trace tab > Select add trace option > then select I(D1:AN). The result will be look like shown in below figure
In this we can obtain the IV-characteristics of diode(1N4007). It can be seen from above figure that current is started to flow after the voltage drop of 0.6V.
I’m also attaching the video link how to obtain the IV characteristics of diode using diode. this will help you to understand the PSpice.