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PSpice User Guide October 2019 21 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Before you begin Welcome OrCAD products offer a total solution for your core design tasks: schematic- and VHDL-based design entry; FPGA and CPLD design synthesis; digital, analog, and mixed-signal simulation; and printed circuit board layout. What's more, OrCAD products are a suite of applications built around an engineer's design flow—not just a collection of independently developed point tools. PSpice is just one element in our total solution design flow. PSpice 1 is a simulation program that models the behavior of a circuit. PSpice simulates analog-only circuits, whereas PSpice simulates any mix of analog and digital devices. Used with design entry tools 2 , OrCAD Capture or Design Entry HDL, you can think of PSpice as a software-based breadboard of your circuit that you can use to test and refine your design before manufacturing the physical circuit board or IC. PSpice analog and digital algorithms are built into the same program so that mixed analog/digital circuits can be simulated with tightly-coupled feedback loops between the analog and digital sections without any performance degradation. After you prepare a design for simulation, OrCAD Capture generates a circuit file set. The circuit file set, containing the circuit netlist and analysis commands, is read by PSpice for simulation. PSpice formulates these into meaningful graphical plots, which you can mark for display directly from your schematic page using markers. 1. Depending on the license available, you will access either PSpice or PSpice Simulator. 2. In this guide, design entry tool is used for both OrCAD Capture and Design Entry HDL. Any differences between the two tools is mentioned, if necessary.