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FMCOMMS1 RF TX frequency sweep

Question asked by Lionel on Jun 10, 2014
Latest reply on Jun 18, 2014 by Lionel



We have a problem in FMCOMMS1 Tx output.

We see when we connect spectrum analyser a frequency sweep around 100 Hz.


This problem degrade our phase noise measurement under 100 Hz and will be degrade our transmission.



We use the fmcomms rev B with an accurate external 10MHz reference.

It appears that the same problem is present when we use the internal reference.


The AD9523 configuration is given in attached files.



Do you have any idea of the problem?