orcad pspice Benutzerhandbuch
Things to watch for
83
The OrCAD libraries include parts that are suitable for
both simulation and board layout. The unmodeled pins
map into packages but have no electrical significance;
PSpice ignores unmodeled pins during simulation.
both simulation and board layout. The unmodeled pins
map into packages but have no electrical significance;
PSpice 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.
results, find an equivalent part that models the pins in
question and draw the connections.
Missing ground
If for every net in your circuit you see this message in the
PSpice output file,
PSpice output file,
ERROR -- Node
node_name
is floating.
then your circuit may not be tied to ground.
Check for this
Are there ground parts named 0 (zero) connected
appropriately in your design?
appropriately in your design?
If not, place and connect one (or more, as needed) in your
design. You can use the 0 (zero) ground part in
SOURCE.OLB or any other ground part as long as you
change its name to 0.
design. You can use the 0 (zero) ground part in
SOURCE.OLB or any other ground part as long as you
change its name to 0.
To find out more about searching for parts,
see
see
.
Pspug.book Page 83 Wednesday, November 11, 1998 1:14 PM