Yes, that is an issue with 5351 if more than one output is used.
That is the circulating current on the ground and substrate of the chip
where in both cases there is finite resistance however small and with a?
50 ohm load on a pair of outputs its easy to see the other oscillator at
its discrete frequency at 56-60db down from the other and sometimes
even the sum and difference.? IF the load resistance is higher say 1K
then the amount of current at each output goes down and so do the
undesired products.
Its one of the things that will define the maximum dynamic range
over some span.
The other area is the mixer its IP3 is better defined but never the less real.
Also any LC filters used depending on their construction and specific
components can also contribute IP3 elements.
Allison
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