LTC5589_Low data Rate issue

Question

Hello

We are using AD9117 and LTC5589 in one of our application.

I have attached our circuit. In high data rate(3.2Mbps) working fine.

For low data rate(less than 1MHz )we are facing SNR issue.

Can you please check our circuit and give a solution for issue.

dmailloux · Accepted Answer

Hi Arumuga, 
 The second constellation plot is representative of a phase noise impairment. You might check the LO phase noise. If possible, perform measurements with an external source that has clean phase noise. 
 Best Regards, 
 David)

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LTC5589_Low data Rate issue