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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

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  • Alex,

    I'm not sure I understand you. The curve you are showing clearly has 10 points, corresponding to the 10 points in the parametric sweep. The lines between the points are just a visual aid, drawn by ViVA. It's not really "continuous". If you had 100 points in the parametric sweep, the graph would look smoother because the straight lines between the points would be shorter.

    Whether the points themselves are from simulation is as I described before - it depends on whether the value() function that you used to construct this waveform was picking values at points that were simulated or whether it had to linearly interpolate. How accurate that interpolation was would depend on the number of points in the inner sweep (DC sweep?) that you performed.

    Regards,

    Andrew.

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  • Alex,

    I'm not sure I understand you. The curve you are showing clearly has 10 points, corresponding to the 10 points in the parametric sweep. The lines between the points are just a visual aid, drawn by ViVA. It's not really "continuous". If you had 100 points in the parametric sweep, the graph would look smoother because the straight lines between the points would be shorter.

    Whether the points themselves are from simulation is as I described before - it depends on whether the value() function that you used to construct this waveform was picking values at points that were simulated or whether it had to linearly interpolate. How accurate that interpolation was would depend on the number of points in the inner sweep (DC sweep?) that you performed.

    Regards,

    Andrew.

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