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AD9361 filter setting for 56MHz RF channel bandwidth

Question asked by apple.chen on Feb 25, 2014
Latest reply on Feb 25, 2014 by tlili
Branched to a new discussion

Hi,

According to the description in AD9361 Interface Spec v2.5,

the RF channel bandwidth can reach 56MHz for 2T2R configurations in LVDS mode.

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However, we can not find suitable register settings for Tx/Rx sampling rate both 61.44MHz

and RF channel bandwidth 56MHz in LVDS 2T2R configurations using the evaluation tool

" AD936x Evalulation Software".

The detailed configurations are shown in the following figures.

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With the above configurations, the resulted Rx and Tx filter response at 28MHz are about -2dB and -4.5dB respectively,

as shown in the following figures. I think the magnitude responses are not good enough for our application.

The should be both less then  -2dB.

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Moreover, when I push the "Create Init Script" botton to generate the low level scripting,

a warnning message appears as shown in the following figure.

It seems that AD9361 cannot reach RF channel bandwidth 56MHz when

Tx/Rx sampling rate both 61.44MHz  in LVDS 2T2R configurations.

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Would you please help me for configurating AD9361 to reach RF channel bandwidth 56MHz when 

Tx/Rx sampling rate both 61.44MHz?

 

Best Regards,

Apple.chen

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