Figure 1: Dialogue box to choose product when Capture starts. Select OrCAD Unison Ultra.
which you will use throughout your degree. SPICE was developed at the University of Cal-
ifornia at Berkeley in the 1970s, and for many years has been the most widely used circuit
simulator in the electronics industry. You will be using a version called PSpice A/D. There are
three steps to using this software.
1. Draw an electronic circuit on the computer using Capture.
2. Simulate it with PSpice using specific models for your devices.
3. Analyse its behaviour with Probe, which can produce a range of plots. Historically this
was a separate application but it is now integrated with PSpice.
People often refer to the whole suite as ‘Spice’. The material in this sheet is a basic start, but
please feel free to experiment.
2 Starting OrCAD
Select Capture with Start > Programs > OrCAD16.0 > OrCAD Capture (the version number
may be different if the software has been updated). There will be a short delay while the
software is loaded and the licence server is accessed. You may be offered a choice of product
as in figure 1; select OrCAD Unison Ultra. Wait until the red splash screen disappears. The
screen will then show the OrCAD Capture main window with a menu bar and a dimmed tool
bar. A sub-window shows the Session Log unless it is minimised, in which case open it.
OrCAD creates a large number of files as it runs, which are organised into a project. Always
create a separate directory (folder) to hold the files for each project. These files should be stored
in your workspace on the University’s central system, accessed via the network as the H drive.
Do not store files in any other place on the network or on a computer – they will be erased.
• Always create a new folder whenever you start work on a new project with OrCAD. Ter-
rible things go wrong if you attempt to store more than one project in the same directory!
• Save your work frequently and take regular backups of important circuits.
Your first action must always be to open a project, either a new one when you are starting a
design or an existing one if you are returning to a previous design. Follow these steps to create
a new project.
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