ACWWong
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sweeping for fixed NF doesn;t sound quick to do in spectre. It looks like the plot you have is generated from some equations and ploted in something like matlab/mathcad etc.
anyway one (labourious) way to do it in cadence would be to sweep current for fixed W and tabluate NFmin (from an sp sim).
Then step W and do it again.
Then load the data into something like Excel or matlab to give the constant NF contours
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