Thanks for the 'tips' Alfonso. Have been using Protel simulation (out
of need) for a few weeks now and in a few words you have explained a
couple of problems I had not yet resolved. [LIBRARY ITEM MATERIAL] .
By the way where is that library of 'significant' postings these days?
Regards,
Jim Parr
----------
Alfonso Baz wrote:
Peter
I suggest you do a search for SPICE. Years ago I managed to download a lot
of documentation on it but as you may understand I no longer have the URL's.
Protel pretty much uses SPICE "out of the box", and the only app specific
things you need to learn about are well documented.
The protel graphical front end is just a GUI to spice and as such the
netlist produced by it can be used by nearly all SPICE engines with little
to no modifications.
Here are a few pointers
- Learn the meanings of Attribute, Part and Read Only fields for the
schematic symbols and how they are used to create the netlist entry.
- Model and circuit files (*.ckt & *.mdl) contain pre-written netlists that
make up the devices you use. The schematic symbol points to them, using the
read-only fields. These can only be edited in the library editor
- Certain devices such as resistors, capacitors, voltage and current sources
are built into SPICE and only require you to enter values
- Simulation usually falls down due to convergence problems. Have a good
look at your cct and make sure that every node has a DC path to ground,
failing that you will have to fiddle with the advance SPICE settings,
particularly the different iteration settings
- If you are having difficulties running a simulation, turn off all analyses
except the DC analysis (Operating point). SPICE will always try to figure
out DC bias in the cct before continuing.
- Create the netlist and have a look at the schematic netlist. You can spend
hours wondering why something wont simulate only to find that a component
hasn't been netlisted correctly. The variable POT in P99SE SP6 is a classic
example of this.
Hope this helps
Cheers
Alfonso
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Peter Krause
Sent: Wednesday, 17 August 2005 8:04 AM
To: Protel EDA Discussion List
Subject: [PEDA] Protel 99SE Simulation
From reading the thread from Tastingfan, is there a suggested website
where to 'learn' on line about protel simulation.
The manual is ok, however, some 'real' views would be great.
Peter
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