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Coupling vs. Decoupling Extraction vs. Silicon Results

Johanny Saenz

Hi all.

I'm simulating an extracted view for a R-DAC. On my simulations results I'm seeing differences on DAC settling time between coupling and decoupling cases up to 20ns. 

 What  would be the extraction method that best fit with Silicon Results? 

My reasoning says me that coupling will be the most realistic because on decoupling method the capacitances are equally sum  and tied from each node to ground.

I think that decoupling extraction is more used to reduce computational effort.

Thanks!

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  • Andrew Beckett

    Generally coupled capacitances will be more accurate; decoupling is good to simply represent the load on each net, but removes the interaction between signals (often it's fine for more digital-centric circuits than for analog). It doesn't general make much difference to the effort needed to extract the parasitics because it's usually a post-processing step to lump the capacitance, but it potentially makes the simulation effort lower.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Generally coupled capacitances will be more accurate; decoupling is good to simply represent the load on each net, but removes the interaction between signals (often it's fine for more digital-centric circuits than for analog). It doesn't general make much difference to the effort needed to extract the parasitics because it's usually a post-processing step to lump the capacitance, but it potentially makes the simulation effort lower.

    Regards,

    Andrew.

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