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How to extract a value from a self-defined plot, maybe using ocean script?

Alex Liao

Hey,

I have a plot which is gm/id (y-axis) Vs Id/(w/l) (x-axis) by doing a Parametric Analysis of sweeping Vgs.

I found in the result folder, it has lots of sub-folders named as Vg=0.111,..., Vg=0.555, Vg=0.666,..., Vg=0.999. Inside each of them, a /psf folder is there. This is reasonable as plenty of DC points are covered in the Parametric Analysis. Therefore all of those '/psf' result directories' are working together to compose a full plot by providing data and maybe do some interpolations.

I want to extract a value from this big plot and do not know how to do it.

Say, I can read when the X which is id/(w/l) = 5u, the Y which is gm/id = 10. But I want to get Y values by providing X values.

I am thinking since the X-Y in the big plot are one-to-one corresponded, if all the data are summarized in one place composing the complete plot or maybe in a big table, then giving a X and asking for a Y should be straightforward.

I am not quite sure if the waveVsWave will summarize all the data and provide a function to access it.

May refer to my previous post on how to do the plot on self-defined axis:

community.cadence.com/.../1343786

Any idea?

Regards,

Alex

Parents

  • Alex,

    Unfortunately when you've done YvsY you can't (yet) send the expression on the resulting waveform to the calculator. So instead, you'd have to enter the expression yourself:

    waveVsWave(?y pv("M0" "gm" ?result "dcOpInfo") / pv("M0" "id" ?result "dcOpInfo") ?x pv("M0" "id" ?result "dcOpInfo") / (pv("M0" "w" ?result "instance") / pv("M0" "l" ?result "instance")) )

    You can then use value() on that expression to interpolate at whatever the x-axis values are on that transformed waveform.

    Because waveVsWave is not in the calculator (but is available as a SKILL/OCEAN function), you'll have to type it into the calculator rather than having a form to complete.

    I think that should do it...

    Regards,

    Andrew.

Reply

  • Alex,

    Unfortunately when you've done YvsY you can't (yet) send the expression on the resulting waveform to the calculator. So instead, you'd have to enter the expression yourself:

    waveVsWave(?y pv("M0" "gm" ?result "dcOpInfo") / pv("M0" "id" ?result "dcOpInfo") ?x pv("M0" "id" ?result "dcOpInfo") / (pv("M0" "w" ?result "instance") / pv("M0" "l" ?result "instance")) )

    You can then use value() on that expression to interpolate at whatever the x-axis values are on that transformed waveform.

    Because waveVsWave is not in the calculator (but is available as a SKILL/OCEAN function), you'll have to type it into the calculator rather than having a form to complete.

    I think that should do it...

    Regards,

    Andrew.

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