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LMK04131 / How to calculate career @snlu099A


I received the following question from my customer.

There is figure 7 on the snlu099A.

My customer would like to calculate manually by themselves.

Could you tell me setting of SPAN and RBW on the the spectrum analyzer observing career spectrum?

Please let me know if you need information.

Best Regards,


  • We traditionally use a 'signal source analyzer' such as a Agilent E5052 for making the jitter measurements. Some spectrum analyzers can also have jitter measurement personalities.

    However it would be possible to use a regular spectrum analyzer to make such a measurement, however the accuracy of your measurement will depend on the number of points you use and ensuring you're not measuring the noise floor of your own instrumentation, the E5052 has a nice feature to help mitigate the impact of the LO noise floor of your instrument through correlations.

    Please note for phase noise, we convert the value to dBc/Hz, so your final phase noise measurement will be -10*log10(RBW). Some spec ans have a 'marker noise' function to make this calculation for you.