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WL1835MOD: WL1835 MRC, add external LNA

Domenico Actis Grosso
Prodigy 40 points
Part Number: WL1835MOD


Hi.

in order to achieve higher distance and due to the fact that we don't have access to any RX/TX signal pins we would like to try to add an external LNA on secondary Wi-Fi antenna, while in MRC configuration.

Do you see any side effect or should it work seamless ?

Thank you

  • 0
    TI__Genius 12940 points
    Hi Domenico,

    You cannot add an external LNA on the WL1835MOD. The RF path shares the RX/TX and thus with an external LNA, you will not be able to receive the incoming signal. This is not an option that is supported.

    Thanks,
    Riz
  • 0 in reply to Rizwan Murji
    Prodigy 40 points

    Hi Riza,

    thank you for your answer but let me clarify the request.

    In MRC mode ANT2 is suggested to work in receive mode only, that's why I'm asking for experiences related on similar scenarioes.

    I don't expect interactions with embedded PA on tx side, even if they share the path.

    Can someone confirm this ?

    Thank you

  • 0 in reply to Domenico Actis Grosso
    TI__Genius 12940 points
    Hi Domenico,

    My apologies, in my previous post I meant to state that that you will not be able to transmit on antenna 2 with an external LNA. I believe we are on the same page here.

    Having said that an external LNA option is not supported as our FW does not support a GPIO to toggle an enable on the LNA as it would not be wise to leave the LNA active under all conditions. Also adding an external LNA means that the modular certification would not be valid and additional certification testing would be required.

    When dealing with our FW and setting up the device yo select 1 or 2 antennas. IF you select 2 it automatically selects MIMO then MRC will kick in based on the internal FW algorithm. Adding an LNA is not an option considered and may break the FW.

    Thanks,
    Riz
  • 0 in reply to Rizwan Murji
    Prodigy 40 points

    Hi Riz,

    thank you for your answer, but something is still not clear.

    According to my understanding MIMO must be enabled directly, setting not only the equipped antennas but forcing MIMO configuring ht.mode = 0x00,

    other configurations selects SISO40 / SISO20.

    Can you confirm this ?

    Thank you

  • 0 in reply to Domenico Actis Grosso
    TI__Mastermind 35795 points
    Hi,
    Yes setting "wl18xx.ht.mode = 0x00" enables MIMO mode . This configuration enables MIMO and also SISO20/SISO40

    Saurabh