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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

  • Hello Andrew,

        thanks for explaining clearly！I got the idea. in my case, I use the following skill code:

     for(row 0 100

        for(col 0 100

       desVar(parameter parameterValue[row][col])

       run()

       selectResult( 'tran )

       valueMatrix[row][col]=value(v(VOUT) timePoint) 

    )

    ) 

    I wonder  whether the"selectResult" will force the simulator to exit? I think the default parametric analysis will finish the simulation first, and then sample all the data. in that way, it require a lot of memory to store the simulation data (many curves), so I plan to sample the data in each simulation, but i found it is slower than the conventional way. in additional, how to manage to sample all the output curves after the simulation in my case if  I will use the default parametric analysis, how does the VOUT name change in the psf data? VOUT_1, VOUT_2, right? 

Reply

  • Hello Andrew,

        thanks for explaining clearly！I got the idea. in my case, I use the following skill code:

     for(row 0 100

        for(col 0 100

       desVar(parameter parameterValue[row][col])

       run()

       selectResult( 'tran )

       valueMatrix[row][col]=value(v(VOUT) timePoint) 

    )

    ) 

    I wonder  whether the"selectResult" will force the simulator to exit? I think the default parametric analysis will finish the simulation first, and then sample all the data. in that way, it require a lot of memory to store the simulation data (many curves), so I plan to sample the data in each simulation, but i found it is slower than the conventional way. in additional, how to manage to sample all the output curves after the simulation in my case if  I will use the default parametric analysis, how does the VOUT name change in the psf data? VOUT_1, VOUT_2, right? 

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