Slotting is a fabrication concept. SPICE doesn't understand slotting.
Don't use it in your sims.
In general, schematics you simulate are not schematics you use for
board layout: they contain extra things like independent sources and
parasitics. There are even problems of convention: board design uses
"U" for chips, but a SPICE subcircuit requires "X". It's a pain, but
I've never seen an EDA tool that could handle the relation between
simulation and fabrication seamlessly. So, keep separate schematics
for sims and fab. Cut and paste is useful.
Remember that the spice-sdb netlister doesn't care about pinnunber:
it's pinseq that matters.
On Jul 31, 2006, at 7:43 PM, John Coppens wrote:
Hi all.
What's the correct way to define things (mainly the symbol) when,
defining a dual or quad opamp? Here are the problems I bounced
against:
1) The quad or dual evidently has common power lines.
2) The model defines the pins in order +, -, V+, V-, and output (which
seems quite common)
3) How do I define the slotdefs? The pins for v+ and v- are drawn
on the
circuit, not just defined as attributes. Can I repeat the pin numbers
unpunished?
4) If I do the above, I get gnetlist -g drc2 complaining that the
second
op-amp isn't in the circuit.
5) If, after giving up, I put it in the circuit, and connect its
pins, so
it won't complain again, I get
"Invalid wanted_pin passed to get-nets [unknown]" (5 times)
6) If I try to define a slot=1 for this component, gschem crashes.
7) And, to top things off, I can't seem to get this running with
ngspice
- I get a report of 'singular matrix'es and non-convergence.
Would someone please have a look at the sym and circuit? As everything
is small, I've attached all files (including the model).
Thanks.
John
<evm_input.sch>
<mc33078-1.sym>
<MC33078.mod>
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John Doty Noqsi Aerospace, Ltd.
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