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How to get phase noise from noise summary at paticular frequency?

Clara Dong

Hi guys,

I'd like to correlated Phase Niose curve with noise summary after pss. I decide to pick 10kHz as a test point, but I find that the logarithmic value of total summarized noise printed in noise summary is not equal to phase noise at 10kHz shown in the curve.

It seems that I should divide total summarized noise by carrier power (because the unit of phase noise is dBc/Hz), but I don't know how to get this carrier power. Could you give me some help?  Thank you :)

Have a good day~

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  • in reply to Clara Dong

    Dear Clara,

    Clara Dong said:
    It seems that I should divide total summarized noise by carrier power (because the unit of phase noise is dBc/Hz), but I don't know how to get this carrier power. Could you give me some help? 

    You are correct. You cannot compare the results in V^2/Hz expressed in dB to dBc/Hz since the two are different quantities. You can obtain the carrier power from the pss time-domain waveform. I hope I understood your question and this provides the insight you need Clara!

    Shawn

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