Cadence PSPICE SCHEMATIC Manual de usuario descargar pdf (Pagina 17)

Figure 23: PSpice A/D with a plot of the voltage in the potential divider for each value of the

load resistance. This is the Alternate Display, selected by clicking on the last menu item.

3. Finally, we must tell Spice to vary this parameter in the simulation.

• Create a new simulation proﬁle. This time it is a good idea to base it on the previous

proﬁle, because we just want to add the parametric sweep to it, so select voltage

sweep in the Inherit From list as in ﬁgure 21 on the previous page. Click OK, which

brings up the usual Simulation Settings box shown in ﬁgure 22 on the preceding

page.

• Leave the existing DC Sweep as it is and click on the Options box for Parametric

Sweep. Select Global Parameter for the Sweep variable and enter its name, Rload.

Type the name in exactly the same way whenever you use it – don’t insert spaces or

change letters between UPPER and lower case. Curly brackets are not needed here.

• Choose a Linear sweep with a Start value of 50, End value of 300 and increment

of 50. This means values of 50, 100, 150, . . . , 300. These will override the default

value of 400 in the parameter block. Finally, click OK.

Run the simulation. Spice will perform a DC sweep for each value of the parameter Rload. It

presents you with a dialogue box called Available Sections when the simulation has ﬁnished so

that you can select which curves you want to plot. You want all of them so click OK. The plot

then shows a family of lines as in ﬁgure 23 instead of a single one. I hid all the text boxes in

the window by clicking on the last menu item, which has only an icon rather than a name, and

gives the Alternate Display shown here.

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Cadence PSPICE SCHEMATIC Manual de usuario Pagina 17