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how to simulate spatial variation to see benefit of common centroid layout

supriyo1985

Is it possible to run post-layout simulation with spatial variation (Monte Carlo) in virtuoso to see the benefit of common centroid layout?

  • No, because this is not how Monte Carlo simulation works.

    • Monte Carlo "mismatch" in Spectre isn't modelling mismatch due to placement. Instead it is actually modelling the residual local variation (device to device) rather than die to die "global" variation (called "process" in Spectre's terminology)
    • The models you get from foundries have no sensitivity to distance between devices. They don't characterise that.
    • Even if they did, there's nothing to describe the distance or alignment of devices and feed that into the simulation.

    Andrew

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