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Insufficient memory to run PSS analysis - how to resolve?

apaj

Hello.

I did see that there are three recent threads with very similar titles, but - unfortunately, with completely different problems described.

I use up-to-date MMSIM and IC5 (2012_2013 package installed on a 32 bit machine) and I have given a swap file to the PSS analysis. I am trying to get IIP3 post-layout simulation to run for my circuit (QRC used for extraction). I want it measured at 8 and 9 GHz with 200 MHz harmonics. I do only 6 steps for signals of power in the range of -20:5 dBm.

Nevertheless, the simulation breaks telling me - insufficient memory. During the simulation, it doesn't really use the file I gave it (<path>/Desktop/pss_swap - it's always 0 bytes). What it actually does is that it creates about twenty files called pss_swap_0, pss_swap_1, and so on, each of them about 1.2 GB. And it does this for every point of calculation.

Now, my question is, is it possible (and how?) to overcome this? If I choose a higher limit for extraction my S-parameters change, so I can not go higher on this. Less than 6 points... does it really make sense? Number of harmonics must remain the same since I need it calculated at certain frequencies. 

Do you have any suggestions how to get this done?

Thank you very much for your time and effort.

Parents

  • Hi apaj,

     

    This is a very quick reply, as I don't have time to delve into this....

     You may want to contact Customer Support for additional assistance.

    • If you are using s-parameters, use the harmonic balance engine, rather than the shooting Newton engine.  HB is much better suited to simulate s-parameters.
    • If you can, use 64 bit spectre (I assume you have access to a machine that can run 64 bit spectre). 

     

    A 64-bit version of Spectre has been developed to handle large circuits that fail to simulate because of their size with the current 32-bit Spectre. By default, 32 bit spectre is used.

    To use 64 bit spectre, you can either:

    - set the following variable:

    setenv CDS_AUTO_64BIT spectre

    - pass "-64" as a command line option to spectre

    To test what version of Spectre is being used, you can use the following:

    % spectre -debug3264 -V

     

    best regards,

    Tawna

     

Reply

  • Hi apaj,

     

    This is a very quick reply, as I don't have time to delve into this....

     You may want to contact Customer Support for additional assistance.

    • If you are using s-parameters, use the harmonic balance engine, rather than the shooting Newton engine.  HB is much better suited to simulate s-parameters.
    • If you can, use 64 bit spectre (I assume you have access to a machine that can run 64 bit spectre). 

     

    A 64-bit version of Spectre has been developed to handle large circuits that fail to simulate because of their size with the current 32-bit Spectre. By default, 32 bit spectre is used.

    To use 64 bit spectre, you can either:

    - set the following variable:

    setenv CDS_AUTO_64BIT spectre

    - pass "-64" as a command line option to spectre

    To test what version of Spectre is being used, you can use the following:

    % spectre -debug3264 -V

     

    best regards,

    Tawna

     

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