Introduction to ARM technology to modify the simulation parameters of D1N4002

Step 1: Draw the circuit diagram, set analysis parameters, archive, and perform simulation

1. All semiconductor components have their corresponding simulation models, so we can change the model parameters according to our needs to produce a diode with different input and output characteristics from the component. First, open a new project D1N4002_1, and then draw the circuit diagram as shown in Figure 1 (you can also copy it from the D1N4002 drawing page).

2. Then use the left mouse button to click on the DIN4002 ground component in the D1N4002 project drawing page. It will turn purple and be surrounded by a dotted frame. Then select the EditPSpice Model function option to open the OrCAD Model Editor window as shown in Figure 2.

3. The left half of the OrCAD Model Editor window shows that the component model to be processed is D1N4002, and the component type is a diode. As shown in Figure 2, change IS from the original 14.11E-9 to 14.11-8, then select File/Exit to save the new model parameter setting values ​​into the file d1n4002-1.lib, and close the Model Editor.

4. Now switch to the Project Manager and expand the PSpice ResourcesModel Libraries folder as shown in Figure 3. You should now be able to see the d1n4002_1.lib file we just created in the window.

5. Please set the DC analysis parameters of project d1n4002_1 as in example d1n4002 above.

6. After saving once, start the PSpice program to perform the simulation. The Probe window will automatically open on the screen.

Step 2: Use Probe to observe simulation results

1. The currently opened Probe blank diagram is for project d1n4002_1. We want to add the simulation results of project d1n4002 to display and compare them together. Please select the FileAppend Waveform (.DAT) option or the shortcut key to open the file selection dialog box, and then select the file named d1n4002-Schematic -dc.dat.

2. Open the Add Traces dialog box and select V (Vo). The Probe window should now look like Figure 4. On a color computer screen, each curve is distinguished by different colors. For black and white printing, you can type in appropriate description text.

3. We can see that when the saturation current Is increases, the curve of the entire forward bias part moves to the left, and the threshold voltage Vb decreases accordingly.

4. Currently, we modify the component model parameters individually, save and simulate them separately, and finally merge and observe them in the Probe window. From the above operations, we can know that this method will be very cumbersome if the component value changes many times. In fact, PSpice also provides a parametric analysis method, which is more labor-saving.