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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

  • Harmonic Balance wasn't supported until MMSIM61 (from memory), so you can't be using the version of spectre that you're saying.

    There is no "swapfile" argument for HB (it wouldn't make any sense to provide this, as the algorithm isn't really amenable to being able to take advantage of it).

    It would be useful to know how you have your tones set up - maybe you can post the analysis statements from the bottom of the netlist, and maybe also any sources/ports that you have in your netlist - or just a picture of the PSS form (use the Options tab at the top of the forum web page when posting to add a screenshot as an attachment)

    Regards,

    Andrew.

Reply

  • Harmonic Balance wasn't supported until MMSIM61 (from memory), so you can't be using the version of spectre that you're saying.

    There is no "swapfile" argument for HB (it wouldn't make any sense to provide this, as the algorithm isn't really amenable to being able to take advantage of it).

    It would be useful to know how you have your tones set up - maybe you can post the analysis statements from the bottom of the netlist, and maybe also any sources/ports that you have in your netlist - or just a picture of the PSS form (use the Options tab at the top of the forum web page when posting to add a screenshot as an attachment)

    Regards,

    Andrew.

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