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LMK04803: question about phase noise

Part Number: LMK04803

Hello,

I used LMK04803 in my design of clock tree. But this is a general question, see below.

There are two signals: A and B. They have the same frequency, but different phase noise. On one branch, A and B mix directly and remove the carrier. But on the other branch, A mix with B after 180 degree phase shift. Then, the two output sum together. So, how should I calculate the phase noise of final output? Can they cancel each other?