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transient noise simulation

analog2

hi guys,

i'm running transient noise simulation, while trying to use this "noise contribution" option, to cancel the noise in few inverter stages:

in pre-layout simulation it works perfectly. however, once using extraction, it doesn't recognize the instance names inside the extracted region.

does someone have an idea how to solve it? maybe the syntax inside the "instance list" supposed to be different in this case?

Thx

Parents

  • The trouble is likely to be that the extraction has probably flattened the hierarchy, and so using hierarchical instances is simply not going to work in this case...

    Andrew

  • in reply to Andrew Beckett

    Dear analog2,

    analog2 said:
    does someone have an idea how to solve it?

    Andrew is correct, but I thought I would offer a technique I often used to maintain the hierarchy and yet provide a good estimate of the layout parasitics that the flattened hierarchy will produce. In Figure 1, I basically re-define each of the instances you include in your noise options panel as both the instance itself and the layout features that interconnect it to its neighbors. In this fashion, I can still use my top level schematic, but with a config view, will instantiate the extracted view of the newly defined layout boundaries for each instance. In this fashion, there are no layout features between each instance as the layouts of each directly abut. Hence, if you want to enable or disable the noise of N instances, you will create N layouts of each of the N instances where the layout of each includes the traces between it and its neighbors. I hope my explanation makes some sense analog2!

    Shawn

    Figure 1

Reply
  • in reply to Andrew Beckett

    Dear analog2,

    analog2 said:
    does someone have an idea how to solve it?

    Andrew is correct, but I thought I would offer a technique I often used to maintain the hierarchy and yet provide a good estimate of the layout parasitics that the flattened hierarchy will produce. In Figure 1, I basically re-define each of the instances you include in your noise options panel as both the instance itself and the layout features that interconnect it to its neighbors. In this fashion, I can still use my top level schematic, but with a config view, will instantiate the extracted view of the newly defined layout boundaries for each instance. In this fashion, there are no layout features between each instance as the layouts of each directly abut. Hence, if you want to enable or disable the noise of N instances, you will create N layouts of each of the N instances where the layout of each includes the traces between it and its neighbors. I hope my explanation makes some sense analog2!

    Shawn

    Figure 1

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