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Warnings from spectre PSS analysis

MohanB

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!

  • It's quite likely that there's a problem with the models of the PDK you're using. You might want to speak with customer support about this - or with the foundry. Check you're running with the latest available models and latest SPECTRE and see whether it goes away, but I would be cautious because it suggests that a model region is wrong (it might be that some of the capacitances are missing in the models).

    Andrew.

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