Plotting operating point values in DC sweep

Hi,
I run a DC-sweep on the common mode input voltage on an operational
amplifier. This should cause some movement in the operating points of
the input transistors. I try to plot the value of vdsat vs. swept
vin_cm, but by using the OP("/N1" "vdsat") I only get one operating
point, the value that is saved in the opInfo in psf directory. If I look
in the dcSweep result, the only data saved for the N1 transistor is the
current through drain.

Any idea what I do wrong?

Kind regards,

 

Hi Svenn,

The OP function gets DC operating point data, not the results from a DC
sweep, which are separately stored.

What you'd need to do is create an include file, with:

save N1

or

save N1:vdsat

in, and then use the results browser to access this information. Off the top
of my head, you can probably get this via pv("/N1" "vdsat" ?result "dcSweep")
or something like that... but it's probably easier to look in the results
browser.

The save statement tells it to save this info for all analyses run.

Andrew.