Figure 15: Simulated voltages and currents for the simple potential divider.
in figure 14 on the previous page. This is where you tell PSpice what to do. There are lots of
tabs but you rarely need to look at anything except Analysis.
The most important choice is the Analysis type. We want only a single simulation for the
potential divider because it is so simple and this is called Bias Point. Choose this, as in figure 14
on the preceding page, and click OK.
Now you can run the simulation with PSpice > Run or the arrow on the toolbar. A dialogue
box should flash by and a new window opens for PSpice A/D. The lower left pane of this con-
tains a log, which should conclude with Simulation complete. Most of the window is intended
for a graph but there is nothing to plot here, so close the application and return to Capture.
Click on the V button in the toolbar (it may be active already), which displays the voltage
at each node of the circuit. Clicking on I shows the currents in the same way. The result for the
potential divider is shown in figure 15. You should be able to confirm that PSpice has applied
Ohm’s law correctly!
3.5 Slightly more complicated simulation – DC sweep
The first simulation was unusual because it was only a single situation. Usually we examine the
behaviour of a circuit while something varies. The variable might be time (transient analysis),
the frequency of a signal (AC sweep) or the magnitude of a voltage (DC sweep). We’ll look at
a DC sweep now.
Create a new simulation profile as in figure 16 on the following page. This time choose a
DC Sweep for the type of analysis. The Sweep variable should be a voltage source and we have
to tell PSpice the name of the source that we wish to vary. Copy the name from your schematic
drawing; it’s V1 here. (It does not produce a list of available voltage sources automatically.)
The Sweep type should be Linear and I chose a range from −10 to 10 with an increment of 1
(these are all voltages but the units are not needed). Click OK and run the simulation as usual.
You should see the PSpice A/D window as before. This time there should be a plot in the
window with a horizontal scale to match the variable in the simulation, V1 here. We must now
tell PSpice what to plot on the vertical axis. This can be done from within PSpice by choosing
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