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spectrum output of Eval-ADF4351 shows undesired high power spikes along with desired signal

Question asked by ssp on Apr 18, 2016
Latest reply on May 10, 2016 by ssp

Hi! Greetings!

 

I have Eval-ADF4351. I synthesized 1GHz wave using the interface software of the evaluation module. I connected the output of Eval-ADF4351 to spectrum analyzer. I set the spectrum analyzer's slow sweep from 950MHz to 1050MHz with high resolution. I observed that the spectrum output of Eval-ADF4351 shows undesired high power significant spikes at 1008MHz, 1016MHz and at 1044MHz along with desired signal at 1GHz. Some of the unwanted frequencies contain higher power even more than the 1GHz frequency carries. Why is it so? I was expecting it to show one single frequency at 1GHz. In later stage, I want to use ADF4351 as a frequency scanner.

 

Please share your views in this regard.

 

Regards,

Sanket

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