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Warnings from spectre PSS analysis

While running a harmonic balance analysis on my rectifier, I receive warnings such as '

CMI-2426: M3: Cdscd = -28 is negative.

CMI-2426: M1: Pdiblc2 = -31 is negative.

I understand that these are parameters of the MOSFETs specified in  the specific PDK, but I have no idea why they keep popping up?

Any clues for the same would be great!

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