How to save transient operating point?

This does work, so you must have done something wrong. Did you get the instance name right?

In fact in more recent IC616 versions, it's available through the ADE UI (Outputs->To Be Saved->Save OP Parameters).

I just tried the "hysteresis" netlist you provided the other day, with a transient simulation (in the same MMSIM version you're using), and adding either:

//save M1:gm M1:vdsat
save M1:all

The first just saves gm and vdsat. The second saves everything. See the results browser:

Regards,

Andrew.

Thank you.

I am not at schoo right now. It is night here so I can not take a picture or post the netlist file.

However, I am having problem with subcircuit components. It is OK with components not in subcircuit.

My circuit includes an instance I0 and I would like to save transient operating point (versus time) of the transistor inside the subcircuit named M0.

To do this, I create a file saveop.scs with the content as below:

save I0.M0:all

Then I refer to that file from Model Libraries. I run the simulation and after that opened psf file.

There is a folder "tran" that is empty.

Also, I tried with IC6.17 version by choosing Outputs->To Be Saved->Save OP Parameters. 

What should I do after choosing "Save OP Parameters". I clicked on a transistor but nothing happened. Normally with something like this (for example printing operating point) after I clicked a component there is a table with operating point parameters appears. 

But I this case, I clicked a component and it just is something like I "select' the transistor.

I also tried to continue to run the simulation but the "tran" folder still shows nothing at all.

You select the transistor, and then either type in the name of the oppoint parameters you wish to save, or hit the "..." button:

If you hit the "Get from simulation" button, it will run a short sim and extract the available parameter names and populate the list to pick from. Because you're setting this up before simulation, it doesn't yet know what the available parameters are.

This inserts the following line in the netlist:

save I0.I0.PM0:gm I0.I0.PM0:vdsat 

(I had selected gm and vdsat). 

These results appear in the results browser in the appropriate place in the hierarchy. You can also use the "plot" checkbox on the ADE form to get them to be plotted automatically, or you can use the ot button in the calculator to retrieve the results. Or you can use the results browser.

If they're not in the "tran" output, and the tran "folder" is empty (which seems strange to me), then maybe you have some strange settings on the Outputs->Save All form, but I can't see how you'd do that either!

The spectre output log should record some information about the number of things saved too - so maybe you need to look at that too.

Regards,

Andrew.

Hi,

The method uses Outputs->To Be Saved->Save OP Parameters works but how about if I want to save more parameters of a component at the same time (for example, ron, rout,...) or save all operating point parameters?

Unknown said:

how about if I want to save more parameters of a component at the same time (for example, ron, rout,...) or save all operating point parameters?

Seriously? You didn't think of trying to select multiple operating point parameter names from the list in the form? If you do this, you'll get a space-separated list of names (e.g. "ron rout"). You can also type in "oppoint" or "all" but maybe that's not quite so obvious.

Andrew.

Well, thank you.

I didn't think that was possible! I just choose one parameter. I think I need to read some tutorial relating to the new version.