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Insufficient memory in PNOISE simulation

Massoud THDN
I'm trying to do phase noise analysis with PSS HB and PNOISE for post layout extracted netlist. I got the following error:
 

Mem Used: 12813.8 MB (Memory Exhausted)
Fatal error found by spectre at freq = 10 MHz during PNoise analysis `pnoise'.
    FATAL (CMI-2002): Insufficient memory available. To reduce memory, please refer to "spectre -h memory".

 

However, I have near 45GB free memory! Why PNOISE cannot use all the available memory? How can I reduce required memory?

I have already reduced parasitics in my netlist and by reducing more I will loose accuracy.

I'm Using Cadence 6.1.5 and MMSIM 10.11. I have enabled 64bits.

Here is my Circuit inventory:
              nodes 131756
              bsim4 1724 
          bsource_1 141  
          bsource_2 282  
          bsource_3 30   
          bsource_4 30   
          bsource_5 2    
          bsource_6 8    
          bsource_7 4    
          bsource_8 4    
          bsource_9 1    
          capacitor 1313 
              diode 35   
           inductor 322  
            isource 2    
    mutual_inductor 8    
           resistor 203266
            vsource 6 

 

 analysis('pss ?engine "Harmonic Balance"  ?flexbalance "yes"  ?oversamplefactor ""  
        ?fund "5G"  ?harms "50"  ?errpreset "conservative"  ?tstab "20n"  
        ?oscana t  ?p "/outn"  ?n "/outp"  ?oscmethod ""  
        ?step ""  ?write ""  ?writefinal ""  ?swapfile ""  
        ?checkpss ""  ?ppv ""  ?backtracking ""  )
analysis('pnoise ?sweeptype "relative"  ?relharmnum "1"  ?start "10M"  
        ?stop "100M"  ?dec "5"  ?maxsideband "20"  ?p "/b_outp"  
        ?n "/b_outn"  ?oprobe ""  ?iprobe ""  ?refsideband ""  
        ?solver "turbo"  ?oscsolver "turbo"  ?augmented ""  ?annotate "steps"  
        ?ppv ""  )

envOption(
    'cmd64bit  t
    'analysisOrder  list("pss" "pnoise")
)
option( ?categ 'turboOpts
    'numThreads  "5"
    'uniMode  "APS"
)

Parents

  • Hi Massoud,

    You may want to contact Customer Support (http://support.cadence.com) and enter a Service Request.

    This error can come about for a number of reasons and talking directly with a Customer Support AE would likely be the quickest way to go.    They would want to see your complete spectre.out file and also the portions of your netlist (analysis statements, save statements, option statements, ports/frequency sources in the circuit, for example.)

    Some things to think about: 

    Do you need to simulate 50 harmonics?  (Do you really need frequency information to the 50th harmonic of the PSS fundamental?) 

    How many nets/nodes are you saving?

    What are the frequencies in your circuit?

    Try simulating with moderate accuracy for starters (errpreset=moderate) to see if that helps.  You can tighten tolerances as needed later.

    You may be better off simulating with QPSS (or HB) analysis.

    Also please look at the following solution on http://support.cadence.com .

    FAQ: 10 Tips for Reducing Memory Usage with SpectreRF

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11178356

    A similar version of these tips can also be seen by typing in an xterm window:

    spectre –h  rfmemory

    You may also want to look at the following solution. (How you have set your PSS harmonics and pnoise sidebands is not optimal):

    Guidelines for setting Pnoise/HBnoise sidebands to get accurate results.

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11732744

    Another thing to try is the latest subversion of MMSIM (at least MMSIM 11.1 ISR19 or later).  There has been at least one CCR on SpectreRF with regards to using aps, 64 bit, and pss analysis.

    best regards,

    Tawna


Reply

  • Hi Massoud,

    You may want to contact Customer Support (http://support.cadence.com) and enter a Service Request.

    This error can come about for a number of reasons and talking directly with a Customer Support AE would likely be the quickest way to go.    They would want to see your complete spectre.out file and also the portions of your netlist (analysis statements, save statements, option statements, ports/frequency sources in the circuit, for example.)

    Some things to think about: 

    Do you need to simulate 50 harmonics?  (Do you really need frequency information to the 50th harmonic of the PSS fundamental?) 

    How many nets/nodes are you saving?

    What are the frequencies in your circuit?

    Try simulating with moderate accuracy for starters (errpreset=moderate) to see if that helps.  You can tighten tolerances as needed later.

    You may be better off simulating with QPSS (or HB) analysis.

    Also please look at the following solution on http://support.cadence.com .

    FAQ: 10 Tips for Reducing Memory Usage with SpectreRF

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11178356

    A similar version of these tips can also be seen by typing in an xterm window:

    spectre –h  rfmemory

    You may also want to look at the following solution. (How you have set your PSS harmonics and pnoise sidebands is not optimal):

    Guidelines for setting Pnoise/HBnoise sidebands to get accurate results.

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11732744

    Another thing to try is the latest subversion of MMSIM (at least MMSIM 11.1 ISR19 or later).  There has been at least one CCR on SpectreRF with regards to using aps, 64 bit, and pss analysis.

    best regards,

    Tawna


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