User`s guide

Parametric Analysis 12
-5
Usin
g
performance anal
y
sis to plot overshoot
and rise time
After performing the PSpice A/D simulation that creates the
data file called
rlcfilt.dat, you can run Probe to compute the
specified performance analysis goal functions.
When Probe is started, you are presented with a list of all the
sections or runs in the Probe data file produced by PSpice A/D.
To use the data from every run, select All and click OK in the
Available Selections dialog box. In the case of Figure 12-2, the
trace I(L1) from the ninth section was added by specifying the
following in the Add Traces dialog box:
I(L1)@9
Fi
g
ure 12-2
Current of L1 when R1 is 1.5 Ohms
To run performance analysis:
1
Select X Axis Setting from the Plot menu in Probe.
2
Select (
✓) the Performance Analysis check box to enable
performance analysis
3
Click OK.
Probe resets the X axis variable for the graph to be the parameter
that changed between PSpice A/D runs. In the example, this is
the R parameter.
To see the rise time for the current through the inductor L1,
select the Add from the Trace menu and then enter:
To access the Add Traces dialo
g
box, in Probe, from the Add
menu, select Traces.
Troubleshootin
g
tip
More than one PSpice A/D run or
data section is required for
performance analysis because
one data value is derived for
each waveform in a related set of
waveforms. A trace of the
derived values cannot be
displayed if there is only one run
or data section because at least
two data points are required to
produce a trace.
However, you can use Eval Goal
Functions on the Trace menu in
Probe to evaluate a
g
oal function
on a sin
g
le waveform, thus
producin
g
a sin
g
le data point
result.
The
g
enrise and overshoot
g
oal
functions are contained in the file
m
sim.prb in the MSIM directory.