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cmin transient parameter and dynamic power consumption

Johanny Saenz

Hi all,

I have the following question:

Could the cmin parameter setting in a transient simulation slightly change the dynamic power consumption of a high frequency block?

Cmin makes sense in an analog RC extracted view in order to improve convergence?

Thanks

  • Andrew Beckett

    Yes it could affect the dynamic power consumption because you've added a capacitor for every node to ground. These capacitors need charging up.

    Generally speaking there should be less need to use cmin with an RC extracted view because there ought to be sufficient capacitance present to smooth out discontinuities in the models. If you have good models and sufficient parasitic capacitance on devices cmin really shouldn't be needed, so it's just an additional aid particularly when you have discontinuous models.

    Regards,

    Andrew.

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