Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice User Guide Creating and editing models October 2019 237 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Example: editing a Q2N2222 instance model Suppose you have a design named MY.OPJ that contains several instances of a Q2N2222 bipolar transistor. If you want to see the effect of base resistance variation on one specific device, Q6, you need to do the following: ■ Define a tolerance (in this example, 5%) on the Rb model parameter. Important Adding tolerance to a device characteristic curve-based model does not make it compatible for use with Advanced Analysis Monte Carlo. ■ Set up and run PSpice Monte Carlo analysis. The following example demonstrates how to set up the instance model for Q6. Starting the Model Editor To start the Model Editor, 1. In the schematic page editor, select Q6 on the schematic page. 2. From the Edit menu, choose PSpice Model. The Model Editor automatically creates a copy of the Q2N2222 base model definition. 3. In the Model Editor, from the View menu, choose Model Text. The Model Editor displays the PSpice syntax for the copied model in the text editing area. Editing the Q2N2222 model instance Text edits appropriate to this example are as follows: ■ Add the DEV 5% clause to the Rb statement (required). ■ Change the model name to Q2N2222-MC (optional, for descriptive purposes only).