User`s guide

2
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30 Simulation Examples
Probe Performance
Anal
y
sis
Performance analysis is an advanced feature in Probe that you
can use to compare the characteristics of a family of waveforms.
Performance analysis uses the principle of search commands
introduced earlier in this chapter to define functions that detect
points on each curve in the family.
Once you have defined these functions, you can apply them to a
family of waveforms and produce traces that are a function of
the variable that changed within the family.
This example shows how to use the performance analysis
feature of Probe to view the dependence of circuit
characteristics on a swept parameter. In this case, the small
signal bandwidth and gain of the clipper circuit are plotted
against the swept input resistance value.
To plot bandwidth vs. Rval usin
g
the performance
anal
y
sis wizard
1
In Schematics, open
clipperp.sch and run Probe.
2
In Probe, from the Trace menu, select Performance
Analysis.
The Performance Analysis dialog box appears with
information about the currently loaded data and
performance analysis in general.
3
Click Wizard.
4
Click Next>.
5
In the Choose a Goal Function list, click Bandwidth, then
click Next>.
6
Click in the Name of Trace text box and type
V(Out).
7
Click in the db level down for bandwidth calc text box and
type
3.
8
Click Next>. The wizard displays the gain trace for the first
run (R=100) and shows how the bandwidth is measured.
This is done to test the goal function.
not
included
in:
At each step, the wizard provides
information and
g
uidelines.
Click , then double-click
V(Out).