Ken Kundert
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You are doing a relative frequency sweep, so 0 Hz is the fundamental frequency. Thus, 32MHz would be the second harmonic. This would more obvious if you did an absolute frequency sweep from 0 to say 100MHz. They you would see the phase noise "tents" at 0, 32MHz, 64MHz, and 96MHz, which represent harmonics 0, 1, 2, and 3.
-Ken
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