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2 side band noise of AD-FMCOMMS1-EBZ

Question asked by Kaos on May 25, 2015
Latest reply on May 28, 2015 by Kaos

Dear Sir/Madam,

 

Our customer is studying with your AD-FMCOMMS1-EBZ.

 

He is trying to make easy-spectrum analyzer to use your AD-FMCOMMS1-EBZ.

And he filtered +/-150kHz bandpass on DSB wave that have 1.5GHz Career, 10MHz Signal, and he measured by 300kHz priodically.

So he found 1.4967GHz and 1.5033GHz signals on it.

Please refer to following captured picture.

 

gnuplot-captured.png

 

These 2 freq. should not appear there.

He confirmed his ADC data in the order of time scales, he catched 1.4967GHz and 1.5033GHz on the signal.

 

Question: Why does 1.4967GHz and 1.5033GHz signals appear on there??

Does your AD-FMCOMMS1-EBZ make happen the 1.4967GHz and 1.5033GHz signals?

Reflection due to isnt balanced PWB?

 

Thanks Kaos

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