Electronics > Projects, Designs, and Technical Stuff
LTSpice pulse options
Simon:
--- Quote from: StillTrying on May 05, 2019, 04:25:33 pm ---
Setting Maximum Timestep to 0.3ns is small enough to see 0.15ns edges for me.
--- End quote ---
You sure? don't you mean it the other way around?
I am just experimenting with my PC, I can reduce my core count in the bios and get a speed boost.
pwlps:
--- Quote from: Simon on May 05, 2019, 03:53:54 pm ---Right, so i tried 1ps :), how do I stop a simulation?, I am set to run for 1s, it's now taking 1s/µs to simulate - opps....
--- End quote ---
Yes, have gone through this too: LTSpice will happily fill up your hard drive if you don't pay attention :) Actually I would be interested too if someone knows how to limit the output file size.
Simon:
--- Quote from: pwlps on May 05, 2019, 04:36:33 pm ---
--- Quote from: Simon on May 05, 2019, 03:53:54 pm ---Right, so i tried 1ps :), how do I stop a simulation?, I am set to run for 1s, it's now taking 1s/µs to simulate - opps....
--- End quote ---
Yes, have gone through this too: LTSpice will happily fill up your hard drive if you don't pay attention :) Actually I would be interested too if someone knows how to limit the output file size.
--- End quote ---
So where does it put the data? does it try to keep it after the program is closed?
pwlps:
--- Quote from: Simon on May 05, 2019, 04:41:46 pm ---So where does it put the data? does it try to keep it after the program is closed?
--- End quote ---
If I remember it was in the same directory as the project files, but I don't have LTSpice installed on my home computer, I can check tomorrow when I'm back in the lab. And yes, the simulation files are not deleted when you close it - unless there is an option I don't know.
iMo:
LTSpice creates .raw files with data at each node and component with stepping xxsec in your directory from which you started your .asc source.
It could be GBytes of data. For example the multislope ADC simulation I did here saved 6.5GB of data after a simulation of a 20ms run.
You may limit the data written with .save directive (ie. ".save V(base) I(R4)").
Also you may delete the .raw data after closing the .asc sim source file (it could be set somewhere).
It also does a compression of the data, and does use a limited precision to save the space (you may switch it off).
You may set the time when it starts to save data, and also you may set maximum step size (the smaller the slower), ie "".tran 0 1s 0.5 10ns does 1sec long transient sim, starts to save data at 0.5sec and max step is 10ns.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version