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LTSpice - comparing 2 simulations
LTSpice - comparing 2 simulations
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Old 4th November 2019, 12:21 PM   #11
Ludus Tonalis is offline Ludus Tonalis  Europe
diyAudio Member
Join Date: Dec 2009
Location: Southampton and Aegina
Default How to merge raw files...

I found the following post in a thread on another forum at electronics cad, Possible to overlay plots from different sims? (LTSpice). The answer is from Mike Engelhard, who wrote and maintains LTspice:

> I have discovered that I can open the .raw files from past sims, and
> compare the plots of old and new sims that way, but there doesn't seem
> to be a way to get a trace from an old .sim onto the same plot as traces
> from a new sim.
> This forces me to build two copies of the same circuit sometimes, to sim
> them simultaneously with different component values, so I can compare
> plots on the same set of axes.
> Is there a better way? Is there any way to do specifically what I'm
> hoping for in LTSpice?

You can merge .raw files from different simulations with a free 3rd
party utility that Helmut Sennewald wrote. That is available from
the independent users' group Yahoo! Groups.

Another approach would be to parameterize the circuit and use a .step
command. For example, change the value of a component from a hard-wired
number to {x*5-.01*temp} and and the SPICE directive
".step param x list 1K 2K 3K" to the schematic. The simulation will be
run three times and be overlaid in one plot. There's other examples
in the examples/Educational directory that do this.

N.B. The LTspice users' group is in the process of moving to LTspice@groups.io | Home as Yahoo is closing down all groups. It is no longer possible to post at the old Yahoo group, and all postings, files and members are in the process of being moved to groups.io.

To access the files section of the group you need to be a member, so I recommend that you join the users' group at its new location to initiate a search for the utility. Helmut Sennewald is the owner of the group, incidentally, and will answer any questions you post (including Help! where is this utility?).

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