Issue link: https://resources.pcb.cadence.com/i/1180526
PSpice User Guide Things you need to know October 2019 50 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. ■ model parameter set, which defines the behavior of a part by fine-tuning the underlying model built into PSpice, or ■ subcircuit netlist, which describes the structure and function of the part by interconnecting other parts and primitives. A subcircuit, sometimes called a macromodel, is analogous to a procedure call in a software programming language. The most commonly used models are available in the PSpice model libraries shipped with your programs. The model library names have a .LIB extension. If needed, however, you can create your own models and libraries, either: ■ manually using the Model Text view in the PSpice Model Editor (or another text editor like Notepad), or ■ automatically using the PSpice Model Editor. See What is the PSpice Model Editor? on page 45 for a description. Stimulus file A stimulus file contains time-based definitions for analog or digital input waveforms. You can create a stimulus file either: ■ manually using a standard text editor such as Notepad to create the definition (a typical file extension is .STM), or ■ automatically using the Stimulus Editor (which generates a .STL file extension). See What is the PSpice Stimulus Editor? on page 44 for a description. Note: Not all stimulus definitions require a stimulus file. In some cases, like DC and AC sources, you must use a schematic symbol and set its properties. Include file An include file is a user-defined file that contains: