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PSpice A/D User Guide October 2019 21 Product Version 17.4-2019 © 2022 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 A/D is just one element in our total solution design flow. PSpice 1 A/D is a simulation program that models the behavior of a circuit. PSpice A/D simulates analog-only circuits, whereas PSpice A/D simulates any mix of analog and digital devices. Used with OrCAD Capture, you can think of PSpice A/D 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 A/D formulates these into meaningful graphical plots, which you can mark for display directly from your schematic page using markers. Comparison of PSpice A/D Tiers The following table identifies the significant features that are included with various tiers of PSpice A/D. 1. Depending on the license available, you will access either PSpice A/D or PSpice A/D Simulator.