Qspice doesnt follow the .step command

QSPICE
1

Hi all,

As the title, somehow in some of my simulation the Qspice completely ignore the .step command.
Unfortunately, its from my simulation for work, so I cant share the simulation file here.

Is there anybody can try to lead me to the potential solution?

Thanks
Arief,

2

In the mean time, I decided to run the simulation in batch mode via Octave.

The parameter sweep is achieved by using .inc syntax inside the Qspice model to fetch the parameter setting in .txt file. With the value in .txt file is edited by Octave to assign the parameter values.

3

Any chance you could remove all confidential information but still replicate the issue, and then share the rest for review?

4

is there any chance to encrypt the schematic?

for the code, I can just send out the .dll…

edit: it seems to be possible, I will need to study how to do the encryption

5

Anything encrypted will prevent troubleshooting the problem.

It depends on whether you think it is a bug or something else. Maybe you could discuss this with Mike and bypass the public channel. I cannot recall any other issue related to .step not functioning.

6

@physicboy ,

I can personally guarantee that the .step command is working.

99% of my sims use the .step command.

However, maybe, there is a special condition where the .step is not executing properly. This is where sharing a non-proprietary version of you sim might help.

Can you provide the output window contents? This might provide some clues.

Check the netlist before you run the sim. Is there the .step command inside it? I believe QSpice doesn’t include commented commands/directives in the netlist.

Len