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Why OCEAN script produce different analysis result from ADE?

datao

Hi,

I uses a scripts to analyze phase noise of a VCO at different control voltage. I found some data points are significantly different from ADE produced. Then I saved script in ADE and load the script in ocean. The phase noise calculated with ocean script is -80. But at ADE, it is -100. Anyone can tell me how to solve this problem? Thanks! The save script is attached as below. The frequency calculated are consisten, but phase noise are different from ocean script.

 

 ocnWaveformTool( 'wavescan )
fp=outfile(sprintf(nil "%s/tmp.csv" resultPATH) "a")
fprintf(fp "vc ts cf wc freq amp vcom phasenoise\n")

simulator( 'spectre )
design(     "/users/dtgong/simulation/testLCVCO/spectre/schematic/netlist/netlist")
resultsDir( "/users/dtgong/simulation/testLCVCO/spectre/schematic" )
modelFile(
    '("/home/dtgong/peregrine/PSC_Release_3.8.1/Rel_3.8.1/gc/models/psa/spectre/modellib.scs" "Nominal")
)
analysis('tran ?stop "200n"  ?errpreset "conservative"  )
analysis('pnoise ?sweeptype "relative"  ?relharmnum "1"  ?start "10K"  
        ?stop "100M"  ?maxsideband "7"  ?p "/vp0"  ?n "/vn0"  
        ?oprobe ""  ?iprobe ""  ?refsideband ""  ?ppv ""  )
analysis('pss ?fund "5.0G"  ?harms "7"  ?errpreset "conservative"  
        ?tstab "500n"  ?p "/vp0"  ?n "/vn0"  ?ppv ""  )
desVar(      "wc" 30u    )
desVar(      "wb" 10u    )
desVar(      "cf" 220p    )
desVar(      "r" 10    )
desVar(      "global_use_preLPE" 1    )
desVar(      "vc" 1.1    )
desVar(      "cl" 60f    )
envOption(
    'autoDisplay  nil
)
save( 'i "/I0/I0/R0/MINUS" "/I0/I0/L0/PLUS" "/I0/I0/L1/PLUS" )
converge( 'ic "/vn0" "0.01" )
temp( 27 )
run()
selectResult( 'tran )
;plot(getData("/vp0") getData("/vn0") getData("/I0/vb") getData("/I0/I0/R0/MINUS") getData("/I0/I0/L0/PLUS") getData("/I0/I0/L1/PLUS") getData("/I0/I0/vtail") )
freq = frequency(clip((VT("/vp0") - VT("/vn0")) 1e-08 4e-08))
;plot( freq ?expr '( "freq" ) )
Phase\ Noise\;\ dBc\/Hz\,\ Relative\ Harmonic\ \=\ 1 = phaseNoise(1 "pss_fd" ?result "pnoise")
;plot( Phase\ Noise\;\ dBc\/Hz\,\ Relative\ Harmonic\ \=\ 1 ?expr '( "Phase Noise; dBc/Hz, Relative Harmonic = 1" ) )
ph_1M = value(phaseNoise(1 "pss_fd" ?result "pnoise") 1000000.0)
;plot( ph_1M ?expr '( "ph_1M" ) )
;freq0 = (freq (VT("/vp0") - VT("/vn0")) "rising" ?xName "time" ?mode "auto" ?threshold 0.0 ?histoDisplay nil ?noOfHistoBins nil)
;plot( freq0 ?expr '( "freq0" ) )
fprintf(fp "%.3fGHz %f\n"  freq*1e-9 ph_1M)
close(fp)

 

Thanks a lot,

 

Datao

 

Parents

  •  Hi, Andrew,

    I moved input.scs to a temporary directory. Then I ran simulation at ADE by press button "netlist and run", the phase noise at 1 MHz offset is -98.6. There is no input.scs in netlist direction created after the simulation. Then I ran the same job at OCEAN, the phase noise at 1MHz offset is -77 and input.scs is created, which is same as the one I moved to temporary directory. Any more comments on that?

    I am still confused.

     

    Thanks a lot,

     

    Datao

     

Reply

  •  Hi, Andrew,

    I moved input.scs to a temporary directory. Then I ran simulation at ADE by press button "netlist and run", the phase noise at 1 MHz offset is -98.6. There is no input.scs in netlist direction created after the simulation. Then I ran the same job at OCEAN, the phase noise at 1MHz offset is -77 and input.scs is created, which is same as the one I moved to temporary directory. Any more comments on that?

    I am still confused.

     

    Thanks a lot,

     

    Datao

     

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