AnsweredAssumed Answered

Attenuation 10MHz band received through RX ad9364

Question asked by bhatnagar.vaibhav81 on May 27, 2016
Latest reply on Jul 6, 2016 by bhatnagar.vaibhav81

Hello,

 

I am using ad9364 chip with customized platform with a project compatible to vivado2014.4.1 and noOS soft of the same revision.

I am implementing a OFDM TX/RX where the bandwidth is 9.33 MHz and sampling frequency is 10MHz I am setting from the noOS.

The tx/rx freq config is as below :

{1280000000,  80000000, 40000000, 20000000,  10000000, 10000000},

  {1280000000,  80000000, 40000000, 20000000,  10000000, 10000000},

  20000000,//rf_rx_bandwidth_hz *** adi,rf-rx-bandwidth-hz

  20000000,//rf_tx_bandwidth_hz *** adi,rf-tx-bandwidth-hz

 

The problem is my received data has an attenuation at its amplitude that is impacting the constellation received as attached herewith.

Please find my current parameters attached herewith.

I receive no error message during the drf calibration, I received no errors in external loopback but my snr reports too high noise (10-12 db), and amplitude of sub-carriers varies like shown.

 

I have an impression that 10mHz signal is not receive well by the rx chaing it is attenuation somewhere.

I am  using AGC slow mode but I do not know if it is really need to configure again for my config.

 

Please let me know if you require more informatino from my side.

 

Best regards,

 

-Vaibhav

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