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Spur at 4.7GHz

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I am using two AD9375 chips interfaced with Zynq MPSoC

I am observing unknown spur(300kHz) alone at 4.7GHz. But it is not there at other Frequencies. Even if i change my frequency by 1MHz

I have probed power supply noise as well as clock phase noise. It is not there

Pics are attached below:

4400MHz

In clock phase noise, I am able to see 500kHz and 1MHz, which is replicating at DAC output. (I think so, But i am not sure). As i am seeing this behaviour at Eval Board(Wide-Band Transceiver) as well 

4700MHz (300kHz). 

But at 4.7GHz, I am seeing the spur at 300KHz and its harmonics at 600KHz . where I probed the supply noise as well as clock phase noise. It is clean at 300kHz and 600kHz. Pic is attached below: Kindly resolve this issue, as this is affecting my SFDR Performance

In both TX Port, It is same



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[edited by: Manikandan_M_M at 4:05 PM (GMT -4) on 22 Aug 2022]