the relationship between the sampling rate and the analog bandwidth of AD9361

Lixin,

From the no-OS software, just call the ad9361_set_rx_rf_bandwidth()/ad9361_set_tx_rf_bandwidth() and ad9361_set_rx_sampling_freq()/ad9361_set_tx_sampling_freq() functions with the freq_hz parameter set according to your requirements.

Regards,

Dragos

RF BW sets the corners of a few analog filters.

There is no forced relationship between the two.

-Michael

The device will support 40MHz Tx sampling rate and 56MHz RF bandwidth.

Moving the post to Microcontroller no-OS drivers subspace.

Kevin,

Can you please post some captures of the good (what you say that works) and the bad (where width is limited) spectrum?

Thanks,

Dragos

Hi DragosB,

     I tried to use these functions to configure the rf bandwidth,but It's seems not work rightly.In my application,I make the tx/rx sample clock 40Mhz,and configure the tx_rf_bandwidth as 56Mhz.And transmit the wind noise into the tx path,but the spectrum width is limited as 40Mhz.And if I use the ad9361_set_tx_rf_bandwidth() function to set tx rf bandwidth less than 40Mhz , it works.But if more than 40Mhz,seems no reponse.I dont know why!

Regards,

Kevin.Wang

Hi 

I  use AD9361.

I also encountered this problem.
We work at a transmission rate of 2MS,

but no matter how much I increase the BW (I checked up to 20M)

I get a bandwidth of 2M,

I also use AD9634

We encountered the same problem, where we were able to solve it by disabling the filters (Register 2) but this is of course not the desired solution

I would be happy to help.

Shmuel

Attached picture - AD9631

AD9634

Shmuel,

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Create a new thread and reference any similar threads if you wish.

-Travis