User Guide

Chapter 10 Transient analysis
256
Defining stimuli
1 Place stimulus part instances from the symbol set:
VSTIM, ISTIM and DIGSTIMn.
2 Click the source instance to select it.
3 From the Edit menu, choose PSpice Stimulus to start
the Stimulus Editor.
4 Fill in the transient specification according to the
dialogs and prompts.
5 From the File menu, choose Save to save the edits.
Example: piecewise linear stimulus
1 Open an existing schematic or start a new one.
2 From the Place menu, choose Part and browse the
SOURCE.OLB part library file for VSTIM (and select
it).
3 Place the part. It looks like a regular voltage source
with an implementation property displayed.
4 Click the implementation label and type
Vfirst. This
names the stimulus that you are going to create.
5 If you are working in a new schematic, use Save from
the File menu to save it. This is necessary since the
schematic name is used to create the default stimulus
file name.
6 Click the VSTIM part to select it.
7 From the Edit menu, choose PSpice Stimulus. This
starts the Stimulus Editor and displays the New
Stimulus dialog box. You can see that the stimulus
already has the name of Vfirst.
8 Select PWL in the dialog box and click OK. The cursor
looks like a pencil. The message in the status bar at the
bottom of the screen lets you know that you are in the
process of adding new data points to the stimulus. The
left end of the bottom status bar displays the current
coordinates of the cursor.
Pspug.book Page 256 Wednesday, November 11, 1998 1:14 PM