Re: LT spice params

Jon Kirwan wrote:
On Wed, 13 May 2009 07:42:54 -0700, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

Robert Baer wrote:
Joerg wrote:

John Larkin wrote:

On Tue, 12 May 2009 12:49:20 -0700, Robert Baer
<robertbaer@xxxxxxxxxxxx> wrote:

John Larkin wrote:

If I want to set Gmin, Abstol, or other LT Spice parameters, and have
them travel with a circuit model, how can I do this? Is there some
text thing I can include on a particular schematic that will set these
params for Spice? The LT Spice Simulation/Control Panel/Spice window
indicates that these settings are not inherently carried across
program invocations. Gmin of 1e-12 is just too leaky!

John


Use .PARAM or better yet .OPTIONS ??

Turns out you click the funny little letter icon, upper-right, and
then type

.OPTION Gmin=1e-18

Plop the resulting string somewhere on your schematic. That makes the
diodes work much better.


This shows up in the ascii netlist file as stuff like...

TEXT -600 -8 Left 0 !.option Gmin=1e-18
TEXT -608 32 Left 0 !.option abstol=1e-18
TEXT -608 72 Left 0 !.option chgtol=1e-18

It's been a while but IIRC you can also use ".option" just once, followed by all the parameters you'd like to change, separated by spaces.

Careful with the computer. When doing stuff like this on a Pentium in the 90's ... tsssk ... tick, tick, tick ... *PHUT* ... Pentium gone.

.OPTION CPU=AMD
:-)

As consultants we often have to take what's there at the clients offices.

That can sting a little, at times:

.OPTION CPU=IMSAI


IEEE Spectrum just had an interesting article about legacy chips that made history, and the 8080 was at least mentioned (under 8088 which was the real break-through).

http://www.spectrum.ieee.org/may09/8747

--
Regards, Joerg

http://www.analogconsultants.com/

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