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Question about Harmonics of AD9371

Question asked by Se-woong on Apr 2, 2018
Latest reply on Apr 3, 2018 by PVALAVAN

Hello,

 

My customer is using AD9371 in their demo system and now they are trying to improve the output performance.

For this, they are using Tx QEC Tracking Calibration function (Enable).

During the test with enabled Tx QEC Tracking Calibration, they found noisy signal at (Local + BW/2) frequency.

Please refer below capture files and let me know your  opinions.

 

1. Test result with Tx 20MHz BW signal analysis

  Q1-1 )  Would you advise the reason why this noise signal is occurred?

 

  Q1-2)  Is this noise signal related with the operation of Tx QEC Tracking Calibration operation?

 

 

2. Test result with Tx 100MHz BW signal analysis

  Q2-1 )  Would you advise the reason why this noise signal is occurred?

 

  Q2-2)  Is this noise signal related with the operation of Tx QEC Tracking Calibration operation?

 

 

Please advise me.

 

Regards,

Se-woong

 

 

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