Kevin Aylward
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Arguably, it doesn’t reduce at all. It’s just a matter of definitions and comparing apples to oranges. Phase noise is specified at a specified offset frequency from the carrier frequency. This offset should, arguably, be treated as relative to the carrier frequency. If the carrier frequency is divided by two, so should the offset frequency, in which case for an ideal divider there will be no change in noise as the relevant noise frequency is now closer to the carrier. There is no such thing as a free lunch. For flat band noise, that is noise far away from the carrier, the noise will actually be increased due to the inherent noise of the divider.
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