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Oscillator Phase Noise with SpectreRF

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On p416 of the SpectreRF User guide, there is a plot of the phase noise vs. frequency for an oscillator in dBc/Hz. The phase noise at close in frequencies to the carrier has a value greater than 0 - I am wondering why is this the case? Or perhaps another way to ask this would be how does spectreRf measure the carrier amplitude to scale the phase noise plots in dBc/Hz. Thank you in advance. -Vijay
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  • Hi Vijay095,

     

    This is discussed in depth in Cadence Online Support Solution

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=1832229

     

    Essentially, values above 0dBc/Hz should be discarded.

     

    best regards,

    Tawna 

Reply

  • Hi Vijay095,

     

    This is discussed in depth in Cadence Online Support Solution

    http://support.cadence.com/wps/mypoc/cos?uri=deeplinkmin:ViewSolution;solutionNumber=1832229

     

    Essentially, values above 0dBc/Hz should be discarded.

     

    best regards,

    Tawna 

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