User Guide

Chapter 4 Creating and editing models
106
You can modify each model characteristic shown in the
Model Spec frame with new values from the data sheets.
The Model Editor takes the new information and fits new
model parameter values.
When updating the entered data, the Model Editor
expects either:
• device curve data (point pairs), or
• single-valued data,
depending on the device characteristic.
For the diode, Forward Current, Junction Capacitance,
and Reverse Leakage require device curve data. Reverse
Breakdown and Reverse Recovery require single-valued
data.
Table 1
lists the data sheet information for the Dbreak-X
model.
To change the Forward Current characteristic
1 In the Spec Entry frame, click the Forward Current tab.
This tab requires curve data.
2 In the Vfwd text box, type
1.3.
3 Press F to move to the Ifwd text box, and then type
0.2.
Table 1 Sample diode data sheet values
For this model characteristic... Enter this...
forward current (1.3, 0.2)
junction capacitance (1m, 120p) (1, 73p) (3.75, 45p)
reverse leakage (6, 20n)
reverse breakdown (Vz=7.5, Iz=20m, Zz=5)
reverse recovery no changes
Pspug.book Page 106 Wednesday, November 11, 1998 1:14 PM