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ADF5355 modification doesn't work properly

Category: Hardware
Product Number: AD9361

Hi, currently I'm using FMCOMMS5 + zcu102 design. In order for both ad9361 to share the same oscillator reference I added the component adf5355 to the design and to the device tree following the link linux/arch/arm64/boot/dts/xilinx/zynqmp-zcu102-rev10-ad9361-fmcomms5-ext-lo-adf5355.dts at main · analogdevicesinc/linux · GitHub.

However, at the time of receiving it only works at certain frequencies up to 6 GHz. For example, at 2GHz the ad9361 doesn't receive information at all, but around its vicinities it does. This phenomena happens for some frequencies (apparently) without following any pattern. Does anybody know why this happens or someone has bumped into this scenario as well?
Also, using pyadi-iio interface, sometimes port from ad9361-B stop working from execution to execution.

Thanks in advance,
Joaquín.

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  • Hi  ,

    Yes it does, analog devices provides an app called iio-oscilloscope which allows to control FMComms5 parameters and control TX signal. Precisely with this app I could determine that after including adf5355 in the device tree, depending on the LO frequency, the received signal suffers more or less attenuation.

    Cheers, Joaquin.

  • Hi  ,

    OK. Thank you. 

    I assume that the iio-oscilloscope probes the RX baseband signal, which means that it is not possible to tell whether the problem lies in TX or in RX. That information would be extremely useful. You would need to cut the loopback and use a spectrum analyzer and an RF signal generator to test each direction separately. 

    It is possible that the loopback path is not properly matched. 

    Cheers, heke

Reply
  • Hi  ,

    OK. Thank you. 

    I assume that the iio-oscilloscope probes the RX baseband signal, which means that it is not possible to tell whether the problem lies in TX or in RX. That information would be extremely useful. You would need to cut the loopback and use a spectrum analyzer and an RF signal generator to test each direction separately. 

    It is possible that the loopback path is not properly matched. 

    Cheers, heke

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