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Parasitic exclusion

manudupouy

Hello,

I was using parasitic filter from an extracted view to discover the worst influences. I understood that I could add some parasitics or include all parasitics of an extracted view. So, if I want to simulate my circuit with all parasitic excluding a net, I have to include all parasitics in my constraint window and deactivate the one I don't want. Logic. But, it would be more simple in this case, by default activating all parasitics (without including the long list of parasitcs) and only put in my constraint window the net I don't want the parasitics.

Is it possible?

Emmanuel

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  • Andrew Beckett

    Hi Emmanuel,

    This can be done with a combination of parasitic filters (I'm assuming you're using the Parasitic Filters in the constraint view - selected via the Parasitics/LDE menu in ADE XL?).

    The idea is that you add a parasitic cell filter for C and R which means that it will include all parasitics by default, and then you'd add a normal parasitic filter for R and C where you turn off the parasitics for the specific nets. In the picture below I've done this (just for excluding the resistances on a particular net):

    Hope that's clear?

    Regards,

    Andrew.

  • manudupouy
    in reply to Andrew Beckett

    Yes, it is clear. Thank you very much Andrew.

    I had tried this option but I was unsuccessful because, for caps, I only selected one net to deactivate all caps connected to that net. It didn't work. So, I concluded that was the wrong way.

    But you showed me it was the right way. And to deactivate caps, I have to select the two nets where the caps are connected.

    Whatever, it is fine now.

    Thanks again.

    Regards,

    Emmanuel

Reply
  • manudupouy
    in reply to Andrew Beckett

    Yes, it is clear. Thank you very much Andrew.

    I had tried this option but I was unsuccessful because, for caps, I only selected one net to deactivate all caps connected to that net. It didn't work. So, I concluded that was the wrong way.

    But you showed me it was the right way. And to deactivate caps, I have to select the two nets where the caps are connected.

    Whatever, it is fine now.

    Thanks again.

    Regards,

    Emmanuel

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