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Noise correlation simulation in pnoise

radiowaves

 Hi,

1. I am using IC6.1.6-64b.500.1 and my simulator version is 10.1.1.296.isr18 64 bit

2. I am simulating a basic downconversion mixer as shown in attached figure. I want to know the correlation between noise at
RF (red) and noise at IF (blue). I tried to follow the following article:
www.cadence.com/.../tdnoise.pdf

In page 7, it uses noisetype=correlations. But this option is not available in this version. How shall I find my required  correlation.

I shall highly appreciate if you provide me an appnote or the steps.

Parents

  • Hi Tawna,

    Thanks for the reply! I tried to run pnoise with noisetype= correlations simulation with maxcycles=5
    using the follwoing script:

    analysis('pnoise ?sweeptype "absolute" ?start "0" ?stop "100M"
    ?maxsideband "5" ?p "/voutp" ?n "/gnd!" ?oprobe ""
    ?iprobe "/PORT0" ?refsideband "1" ?noisetype "correlations" ?maxcycles "5" )

    analysis('pss ?engine "Harmonic Balance" ?flexbalance "yes" ?oversamplefactor "1"
    ?fund "2.4G" ?harms "5" ?errpreset "conservative" ?tstab "10n"
    ?step "" ?write "" ?writefinal "" ?swapfile ""
    ?checkpss "" ?backtracking "" )

    I tried to access the results using the tools>result browser>pnoise_corr folder. But I dont understand what those waveforms mean. I have read the documents including theory and user guide but this simulation and its output result format is NOT explained properly.

    The pnoise_corr folder  shows a list of I and V waveforms which are in complex form. The circuit is a mixer.

    What these waveforms mean?
    Are they PSDs?
    Are they correlation co-efficients? If yes then between which ports, which sidebands?

Reply

  • Hi Tawna,

    Thanks for the reply! I tried to run pnoise with noisetype= correlations simulation with maxcycles=5
    using the follwoing script:

    analysis('pnoise ?sweeptype "absolute" ?start "0" ?stop "100M"
    ?maxsideband "5" ?p "/voutp" ?n "/gnd!" ?oprobe ""
    ?iprobe "/PORT0" ?refsideband "1" ?noisetype "correlations" ?maxcycles "5" )

    analysis('pss ?engine "Harmonic Balance" ?flexbalance "yes" ?oversamplefactor "1"
    ?fund "2.4G" ?harms "5" ?errpreset "conservative" ?tstab "10n"
    ?step "" ?write "" ?writefinal "" ?swapfile ""
    ?checkpss "" ?backtracking "" )

    I tried to access the results using the tools>result browser>pnoise_corr folder. But I dont understand what those waveforms mean. I have read the documents including theory and user guide but this simulation and its output result format is NOT explained properly.

    The pnoise_corr folder  shows a list of I and V waveforms which are in complex form. The circuit is a mixer.

    What these waveforms mean?
    Are they PSDs?
    Are they correlation co-efficients? If yes then between which ports, which sidebands?

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