LTSpice plot voltage vs step param

[Marco Trapanese]

Hello,

I can't figure out how to plot a voltage versus a step parameter.
I defined:

..step param R 100 150

but now I don't know what's the right simulation directive.
I tried the tran command, and it actually plots several curves for each
step. They are super-imposed of course.
Instead the goal is to put my {R} variable into the horizontal axis -
changing the plotted quantity field leads to error (undefined symbol).

I searched in the help without find anything useful.
Thanks in advance
Marco

 

[Marco Trapanese]

Il 23/01/2013 15:52, Jim Thompson ha scritto:

In PSpice, it would be done in a .DC analysis. I think it's the same
in LTspice.

If I understand correctly the guide the .dc directive requires either a
voltage or current source to sweep.

Marco

 

[Marco Trapanese]

Il 23/01/2013 18:23, Jim Thompson ha scritto:

Hi Marco, I posted your question to the LTspice List...


and got this answer...

"Hello Jim,

Please use this syntax below without .DC .

.step param R 35 100 1
.op

If R is the value of a resistor, use {R} for its value.

Best regards,
Helmut"

I haven't tried it, but I don't think its the same effect.

Thank you very much Jim.
Tomorrow I will try the solution proposed - anyway I'm afraid it's not
what I'm looking for.

I'll join the list too.

Marco