LTSpice Question - Simulation Directives

Thread Starter

elec_eng_55

Joined May 13, 2018
214
Hi:

I find that when I want to run a sim, the directives on the schematic
change by themselves. For example, when I run the "op" sim for
the attached schematic, the "ac" directive on the schematic changes
and has the same parameters as the "op" directive.

Others that I have spoken to, say that they have the same issue.

Any thoughts?

David
 

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Alec_t

Joined Sep 17, 2013
10,470
the "ac" directive on the schematic changes
and has the same parameters as the "op" directive.
AFAIK the .op directive should have no parameters and any you specify after '.op' will be ignored.
When you change analysis mode you may need to edit any directives for other modes, or turn them into comments.
 

Veracohr

Joined Jan 3, 2011
689
I've never seen that, and it didn't happen when I ran your simulation. I run LTSpice on a Mac, so I guess it could be a Mac/Windows difference. However, the .op directive has no parameters so I'm not sure how the .ac directive can take on the parameters of the .op.
 

eetech00

Joined Jun 8, 2013
1,726
Hi:

I find that when I want to run a sim, the directives on the schematic
change by themselves. For example, when I run the "op" sim for
the attached schematic, the "ac" directive on the schematic changes
and has the same parameters as the "op" directive.

Others that I have spoken to, say that they have the same issue.

Any thoughts?

David
Hi

Unfortunately, that's just the way it works. When changing directives you have to remember to check the directives' parameters.

Its sometimes easier to place predefined directives on the schematic as comments, then toggle between them being a comment or a directive.

eT
 
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