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How does the parametric analysis work?

imagesensor123

Hello,

       we all know that the parametric analysis is quite a useful tool in cadence, we can sweep any parameters in the design. I refer to the 

cadence user guide and I find that it is a "for loop" simulation. I perform  the same simulation by using the same "for loop" , but I find the parametric analysis is much faster than the common "for loop". I would like to know why the parametric analysis is faster? is there some optimization for the parametric analysis ?

 regards,

zfeng 

Parents

  • Andrew,

    I did a quick comparison by doing a parametric ac frequency sweep on an opamp in IC614. The sweep steps a common mode voltage variable 5 times. I then recorded the total simulation time in seconds for different controlModes and ways of executing the task. The for loop runs as follows:

    foreach(Param '(0 0.425 0.85 1.275 1.7 )
    desVar("Vi_cm" Param)
    run()
    )

    and the ocean parametric:

    paramAnalysis("Vi_cm" ?values '(0 0.425 0.85 1.275 1.7 ))
    paramRun()

    The ade-parametric simulation runs a parametric analysis using the ADE GUI. The table below shows the simulation times in seconds

      interactive batch
    for loop 14 12
    ocean parametric 15 13
    ade-parametric 3 3

    I would like to know if there is a way to speed up the ocean parametric simulation, so that the simulation time could be compared to ade-parametric?

    Regards, Tjaart

Reply

  • Andrew,

    I did a quick comparison by doing a parametric ac frequency sweep on an opamp in IC614. The sweep steps a common mode voltage variable 5 times. I then recorded the total simulation time in seconds for different controlModes and ways of executing the task. The for loop runs as follows:

    foreach(Param '(0 0.425 0.85 1.275 1.7 )
    desVar("Vi_cm" Param)
    run()
    )

    and the ocean parametric:

    paramAnalysis("Vi_cm" ?values '(0 0.425 0.85 1.275 1.7 ))
    paramRun()

    The ade-parametric simulation runs a parametric analysis using the ADE GUI. The table below shows the simulation times in seconds

      interactive batch
    for loop 14 12
    ocean parametric 15 13
    ade-parametric 3 3

    I would like to know if there is a way to speed up the ocean parametric simulation, so that the simulation time could be compared to ade-parametric?

    Regards, Tjaart

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