User`s guide

Analyzin
g
Results 14
-23
Anal
y
zin
g
Results
MicroSim Probe is the waveform analyzer for PSpice A/D
simulations. Probe allows you to observe and manipulate
interactively the waveform data produced by circuit simulation.
For mixed analog/digital simulations, Probe can display analog
and digital waveforms simultaneously with a common time
base.
PSpice A/D generates two forms of output: the simulation
output file and the Probe data file. The calculations and results
reported in the simulation output file act as an audit trail of the
simulation. However, the graphical analysis of information
stored in the Probe data file using the Probe program is the most
informative and flexible method for evaluating simulation
results.
To displa
y
waveforms in Probe
1
In Probe, from the Trace menu, select Add.
2
Select traces for display:
• In the Simulation Output Variables list, click any
waveforms you want to display. Each appears in the
Trace Expressions box at the bottom.
• Construct expressions by selecting operators, functions
and/or macros from the Functions or Macros list, and
output variables in the Simulation Output Variables list.
In effect, Probe is a software
oscilloscope. Runnin
g
PSpice A
/
D corresponds to buildin
g
or
chan
g
in
g
a breadboard, and
runnin
g
Probe corresponds to
lookin
g
at the breadboard with
an oscilloscope.
For a full discussion of how
Probe is used to analyze results,
see
Chapter 17,Analyzing
Waveforms in Probe.
For detailed information on how
to add di
g
ital traces, see Digital
Trace Expressions on
page 17-57.