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Monte Carlo - Virtuoso IC 6.1.5

kenambo

Hi,

In monte carlo analysis, what is the need for the "monte carlo seeds" field.

Is there any result variation for the different number of seeds..

Thanks.

Parents

  • Knowing just the process node isn't what I was after - I wanted to know the foundry too. Anyway, from what you've posted, it looks like TSMC.

    Are you using the "_mac" or "_mis" devices in your schematic (I can't remember whether they are called mac or mis in that particular technology)? I suspect not...

    TSMC had this tendency to have two different flavours of device, one which supports mismatch and one which doesn't. Most customers use the mismatch (or macro) devices all the time as changing the schematic is not really something you want to do on a regular basis - and with spectre, there's not really a disadvantage of using the subckt models. I think in newer technologies they always need to use a macro model so this isn't necessary.

    If you are not using the mac/mis devices, then monte carlo will be varying the parameters (because it has a statistics block), but they won't be consumed by the models, hence no significant variation. Process variation will still work however because that doesn't need the models to be in subckts.

    Regards,

    Andrew.

Reply

  • Knowing just the process node isn't what I was after - I wanted to know the foundry too. Anyway, from what you've posted, it looks like TSMC.

    Are you using the "_mac" or "_mis" devices in your schematic (I can't remember whether they are called mac or mis in that particular technology)? I suspect not...

    TSMC had this tendency to have two different flavours of device, one which supports mismatch and one which doesn't. Most customers use the mismatch (or macro) devices all the time as changing the schematic is not really something you want to do on a regular basis - and with spectre, there's not really a disadvantage of using the subckt models. I think in newer technologies they always need to use a macro model so this isn't necessary.

    If you are not using the mac/mis devices, then monte carlo will be varying the parameters (because it has a statistics block), but they won't be consumed by the models, hence no significant variation. Process variation will still work however because that doesn't need the models to be in subckts.

    Regards,

    Andrew.

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