Spectre using variables in outputs

[andrew_que]

Hi there, I'm using spectre to simulate some circuits. I'm performing a DC simulation with a variable sweep "vin" that ranges from 0 to 10 (as in the image below)



I would like to plot some expressions of the variables combined with some parameters of the circuit.
The problem is I can't even plot the variable which is sweeped. By using the calculator I get the expressoin VAR("vin"), and I would expect the plot of a straight line, but vin is only evluated at the first point (0), resulting in the constant, as sown in the image.



What am I doing wrong?

 

[pancho_hideboo]

You have to understand data structure in PSF directory.

X-axis data alone is not available in PSF data.

Use Ocean function xvar().

 

[andrew_que]

Sorry I'm a newbie with this tool, may you explain more in deep what psf directory and xvar are? Maybe a good link where I can find out more?
If I just write xvar("vin") in the expression it doesen't work..

 

[pancho_hideboo]

Launch skill finder.
Or read Ocean document.

Sorry xvar() is wrong.
xval() is correct.

Again vin is not available directly.
For example use xval(getData("/out" ?result "dc"))

See https://www.designers-guide.org/Forum/YaBB.pl?num=1106643861

 

[andrew_que]

In the end I managed to do that by using VS("/netXX").
I also tried xval(v("/netxx")), which was suggested in your link but it didn't seem to work (v returned nil).
Thank you anyway, I'll probably find out more later on.

 

[pancho_hideboo]

In the end I managed to do that by using VS("/netXX").

"VS()" is a Calculator function.
Full ability of post processing can never be available, if you use Calculator functions.

See https://www.edaboard.com/threads/352981/#2

I also tried xval(v("/netxx")), which was suggested in your link but it didn't seem to work (v returned nil).

You have to set "?result s_resultName" liken following.

xval( v("/netxx", ?result "dc") )

See Ocean Manual or launch Skill finder to know more details about Ocean functions(=Skill functions).