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From: "Helmut Sennewald"
Subject: Re: SwCADIII
Date: Sat, 4 Jan 2003 21:44:25 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
"mmormota" schrieb im Newsbeitrag
> Hi All,
> I am working on a complicated amplifier design using SwCADIII (latest).
> tool is great, helps a lot. After reading the help, faqs, searching the
> without success, I have some questions:
> - How can I add a new double schottky diode SPICE modell to the existing
> library? The existing "schottky" diode is probably not a schottky one...
if you you have simply the model of one diode, I recommend to add it at
the end of the "standard.dio" library file.
Then you can selct it as any other diode model already included in SwCADIII.
> I already added opamps, but the format of the diodes seems to be slightly
> different - the line pointing to the library element in the . asy file of
> the opamp is missing in case of the diode.
You can also make a subcircuit containing both diodes.
In this case you have to wrap the subcircuit around the two diodes.
It would then be done like an opamp model.
> - Sometimes the starting voltage of a capacitor seems to be 0, sometimes
> stable DC working point of the circuit. After minor modifications of the
> circuit, the situation alternates. Very disturbing. Is it a feature, or I
> missed something?
It happens often that especially large circuits make problems with
Sometimes the circuit itself is wrong. You could send me your circuit to
take a look at it.
> - Sometimes the transient analysis slows down to fs/sec "speed" without
> obvious reasons. After minor modifications on the circuit diagram, it
> possibly works again. What is the normal way to avoid this slowness? Is it
> feature, or I missed something?
That happens if the circuit simulation has problems. The time step will
be reduced automatically to very slow values in this case. If this doesn't
help, the simulation aborts after a while.
> - Is there a SPICE model for the Microchip MCP6549 comparator? Of course I
> already searched it on their site without success.
It seems there is no model available. Ask the Microchip company for it.
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