How does the output phase noise of your frequency dividers degrade as the input power level is reduced? Do you have any examples of this effect for something like the HMC438?
Yes, the phase noise floor of the dividers may increase as the input power level drops, especially with low frequency sine wave inputs. We don't have any particular data for the HMC438 showing this behavior. If you must drive with low frequency and low power levels, we'd recommend a square wave for best floor performance.
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