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AD9914 Eval Board Spurs

Question asked by mlort on Jul 18, 2018
Latest reply on Jul 23, 2018 by mlort

Hello,

 

I am using the AD9914 Evaluation board and programming it with the Evaluation software. I want to generate a frequency sweep centered at 860 MHz with a BW=10 MHz, as can be seen in the following picture. The 25 MHz external clock is introduced from a signal generator.

 

Unchecking the box corresponding to one of the No Dwell bits and without having DRCTL signal, I am able to see the behaviour of a single tone:

Regarding the measurement shown in the picture I have different concerns:

 

   1: Why I have these two spurious at 4.168 Mhz from f0?

   2: Is it possible, somehow, to increase the output power?

 

Thank you in advance,

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