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ad9361 filters placement

Question asked by Selwyn on Mar 31, 2017
Latest reply on Apr 5, 2017 by sripad

Hi,

 

I am curious to know why the FIR placement for tx &  rx is placed at the interface level instead of near the DAC/ADC, before DAC and after ADC. What is purpose of placing the position there, is it to reduce anti-aliasing effect before up/downsampling to DAC/ADC rate? If so, wouldn't it be better to place them directly before DAC and after ADC.

 

The reason for asking is because I am unclear of the FIR intention based on its placement. Not sure whether I should bypass them or use them for my design porting. I am afraid if bypassing the FIR and design our  own filters via PL resources,  our signal performance might degrade.

 

Please kindly educate me on this part.

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