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How transient operating point is calculated in cadence

prashu

 When performing transient analysis with cadence my input is changing and accordingly its operating point should change but when i see its transient operating point than it only show one region throughout the transient analysis please expalin

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  • Zfeng,

    Spectre itself can do this - you would specify the infoname parameter on the tran analysis to whatever you've called the info analysis with what=captab. However, support for doing this through ADE is limited. You can do this:

    1. Enable captab on your DC analysis
    2. On the transient analysis, fill in the Additional Parameters field on the options form to be:
      infoname="capInfo_dc" infotimes=[1n 2n]
    3. Don't fill in the infotimes field (actually you can, but then you get a potential conflict as there will be two infoname parameters on the tran analysis line, so probably not a good idea, and then the results post-processing doesn't work).

    Interestly you can then use Results->Print Capacitance Table and choose which time to show. You can also access the data in the results browser and plot the capacitances versus the times specified in the infotimes.

    Regards,

    Andrew.

Reply

  • Zfeng,

    Spectre itself can do this - you would specify the infoname parameter on the tran analysis to whatever you've called the info analysis with what=captab. However, support for doing this through ADE is limited. You can do this:

    1. Enable captab on your DC analysis
    2. On the transient analysis, fill in the Additional Parameters field on the options form to be:
      infoname="capInfo_dc" infotimes=[1n 2n]
    3. Don't fill in the infotimes field (actually you can, but then you get a potential conflict as there will be two infoname parameters on the tran analysis line, so probably not a good idea, and then the results post-processing doesn't work).

    Interestly you can then use Results->Print Capacitance Table and choose which time to show. You can also access the data in the results browser and plot the capacitances versus the times specified in the infotimes.

    Regards,

    Andrew.

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