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Question on PLL's phase noise test (Read 1248 times)
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Question on PLL's phase noise test
Jun 08th, 2016, 6:48am
I am using a spectrum analyzer to measure a PLL's output normalized phase noise L(f);
My measurement method is Direct Spectrum Measurement and the spectrum analyzer is set: RBW=1KHz, detector=average;
On L(f) calculation, Stanley_J._Goldman's book "Phase-Locked Loop Engineering Handbook for Integrated Circuits" introduced one way as the attached picture show.
While, some Agilent spectrum analyzer manual books say, the phase noise under test should be:
I am wondering which one is correct for phase noise test.
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