User`s guide

3
-
32 Preparin
g
a Schematic for Simulation
The MicroSim libraries include parts that are suitable for both
simulation and board layout. These parts may have a mix of
modeled pins (solid line) and unmodeled pins (broken line). The
unmodeled pins map into packages but have no electrical
significance; PSpice A/D ignores unmodeled pins during
simulation.
Check for this
Are there connections to unmodeled pins?
If so, do one of the following:
• Remove wires connected to unmodeled pins.
• If you expect the connection to affect simulation results,
find an equivalent part that models the pins in question and
draw the connections.
Missin
g
Ground
If for every net in your circuit you see this message in the PSpice
output file,
ERROR -- Node node_name is floating.
then your circuit may not be tied to ground.
Check for this
Are there AGND or EGND symbols connected appropriately on
your schematic?
If not, place and connect one (or more, as needed) on your
schematic.
unmodeled
pins
To find out more about searchin
g
for parts, see
Finding the part
that you want on page 3-9.
This applies to analo
g
-only and
mixed-si
g
nal circuits.
AGND EGND