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E4448A phase noise measurement?

Question asked by serkan on Aug 22, 2011
Latest reply on Aug 24, 2011 by JohnMiles
Hi all,

I have a question regarding the phase noise measurement with E4448A. I was measuring the phase noise of the 20 GHz free running LC VCO, and the measured phase noise is constant from 10kHz to 200-300kHz (-60dBc/Hz). However, it should linearly decrease from 10kHz to 300KHz. However, the phase noise starts decreasing after 300kHz offset. What is the reason behind it?