Hi all,


I'm trying to simulate the IIP3 of a down-conversion system, but the simulation always fails due to insufficient memory. In the QPSS options, I enabled a swapfile (there's around 13 GB free space in that drive), and I enabled compression, and I only saved the selected nets. Is there anything else I can do to get the simulation to finish. Note that my run directory has about 13 GB of free space, and the computer's memory is 3 GB. The output log file always says the following:

Mem Used: 3056.9 MB (Memory Exhausted)
Warning from spectre during IC analysis, during periodic steady state analysis, during Quasi-Periodic Steady State Analysis `sweepqpss-002_qpss', during Sweep analysis `sweepqpss'.
   WARNING (SPECTRE-16001): Sweep iteration for `prf' = -60 terminated prematurely because of the following error(s):
Fatal error found by spectre during IC analysis, during periodic steady state analysis, during Quasi-Periodic Steady State Analysis `sweepqpss-002_qpss', during Sweep analysis `sweepqpss'.
   FATAL (CMI-2002): Insufficient memory available, To reduce memory for rf analyses, please refer "spectre -h rfmemory".


I can't seem to find this spectre -h rfmemory either...


thanks,
Aaron

Hi pancho_hideboo,


I am using the default method which seems to be the Shooting-Newton method.

Here is the circuit inventory. It is a post-layout simulation, so its pretty large. Now that I look at it i'm not sure why there are so many inductors. I only did a C+CC extraction.

Circuit inventory:
             nodes 4253
             balun 1    
           bsim3v3 8352  
         bsource_1 14    
         capacitor 18667
             diode 182  
          diode_va 32    
          inductor 359  
   mutual_inductor 6    
              port 4    
          quantity 9    
            res_va 256  
          resistor 2203  
           vsource 9    

thanks,
Aaron

Quote:


thanks. I'll give it a try


Aaron