[SOLVED] [LTSpice] How to plot ID of a MOSFET which is located in a subcircuit

[pifouille]

Hello all.

Hopefully, the title is sufficiently explicit...

Let's say I have a M1 mosfet transistor in an X1 instance of my LTSpice design.
I can't manage to plot the drain current of this mosfet..
I tried entering the following expressions in the waveform viewer:

-- Id(x1:m1)
-- Id(m:x1:1)  ** After a .OP simulation, this is how the transistor is called in the log file
-- Ix(x1:m1:d)
-- Ix(x1:m1:1)

none of those is working.
Any idea?

Thanks anyway!

Pif.

 

[Dominik Przyborowski]

I don't know LTspice, however:
1. ensure you have saved desired current: https://www.edaboard.com/showthread.php?209216-ltspice-ploting-internal-nodes-or-subcircuit-nodes
2. I believe this tool is following spice syntax, so use dot to access lower hierarchy level like this: i(X1.M1:1)
3. If above doesn't helps, maybe look on the documentation?

 

[pifouille]

Thank you very much for your answer..
Yes, I obviously looked in the LTSpice doc, but it's quite brief and basic.
I also had a look at the Spice webpage at UC Berkeley, but didn't find anything related.

Anyway, I already tried what you suggested but it didn't work..
I'm gonna read the thread you thru the link you provided.

Thanks again

 

[pifouille]

That worked!!

As explained in the thread you linked, I just had to check the "save subcircuit voltages/currents" boxes in the control panel.
Very sorry, I tried to run a search on "LTSpice" in the forum before posting, but apparently, i did that wrong...


Thank you so much