AnsweredAssumed Answered

AD9517-4 phase noise

Question asked by alrok on Dec 9, 2014
Latest reply on Jan 19, 2015 by Kyle.Slightom

Hello!

 

We are using AD9517-4 for reference frequency set generation: 400MHz, 200MHz and 100MHz. We used GXO-E72 100MHz PECL crystal oscillator as reference.Our problem is - there is too much noise at offsets between 100Hz and 100kHz.

Reference (100MHz) phase noise:

reference.jpg

100MHz PECL output:

SEC_SYN_NEW_FILTER.jpg

ADIsimCLK simulation results:

ADIsimCLK.jpg

What may be a reason of this ?

Thanks in advance.

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