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difference between the two phase noise functions in Direct Plot Form?

Soner

Hi,

I am trying to simulate the phase noise of a 25GHz LC oscillator using pss (flexible balance) and pnoise analysis. In the Direct Plot Form, there are two different Phase Noise options:

1) Analysis: pnoise  Function:Phase Noise

2) Analysis: pnoise jitter Function: Phase Noise

The two above give different results (#1 is approximately ~2.3dBc lower than #2 @ 10MHz offset). What is the difference between these two functions?

I would like to note that #1 provides much more numerically stable results than #2.

 

Parents

  •  Hi Soner,

    You may want to take a look at the following solutions on Cadence On-Line Support:

     

    1. Phase noise is not consistent for pnoise sources and Jitter in ADE

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11175734

     

    2. FAQ: What is the equation that relates jitter to phase noise?

     http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11196272

     

    3. Explain the differences between the 4 noisetype settings for pnoise

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11196266

     

    In fact, there are a great deal of Solutions on phase noise, jitter, pnoise.  The following solution summarizes many of them and where to find them: 

     

    4. Summary of existing documentation on various RF related noise analyses

     http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11585972

     

    best regards,

    Tawna

Reply

  •  Hi Soner,

    You may want to take a look at the following solutions on Cadence On-Line Support:

     

    1. Phase noise is not consistent for pnoise sources and Jitter in ADE

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11175734

     

    2. FAQ: What is the equation that relates jitter to phase noise?

     http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11196272

     

    3. Explain the differences between the 4 noisetype settings for pnoise

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11196266

     

    In fact, there are a great deal of Solutions on phase noise, jitter, pnoise.  The following solution summarizes many of them and where to find them: 

     

    4. Summary of existing documentation on various RF related noise analyses

     http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=11585972

     

    best regards,

    Tawna

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