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AWR1642: Is AWR1642 RX gain setting related to LNA or IF gain?

JY Su
Intellectual 425 points
Part Number: AWR1642

As we modify the configure RX gain, is it related to LNA or IF gain change?

  • 0
    TI__Guru 58035 points
    Hello JY Su,
    The RX gain is the complete chain gain, from the LNA to the ADC input. So this includes LNA and IF stages.
    There are two parameters Rx gain and RF target gain. The RF target gain is the gain at the RF stages (LNA and mixer) , the remaining gain for the RX chain is set at the IF. For example of you set 36dB RX gain and 30dB RF gain target, then the RF gain would be set close to 30dB and IF gain would be set close to 6dBto achieve a 36dB RX gain.

    Regards,
    Vivek
  • 0 in reply to Vivek Dham
    Intellectual 425 points

    Sir,

    In case, if RF gain is set as 36dB & RX gain is set as 34dB, does it mean IF gain is -2dB? Is it possible?

    JY 

  • 0 in reply to JY Su
    TI__Guru 58035 points
    Hello JY,
    That is correct, the IF gain can be negative.

    Regard,
    Vivek
  • 0 in reply to Vivek Dham
    Intellectual 425 points

    May I know if RF gain is already configured & embedded in the firmware's bin file? So, as I change the RX gain setting in the configure file, it is related to LNA gain different? 

  • 0 in reply to JY Su
    TI__Guru 58035 points
    Hello JY Su,
    Both the Rx gain and RF gain are programmable by the user. The profile configuration API that you issue has both these as parameters. If you are using the SDK application refer to the mmwave link API rlProfileCfg(). The RX gain parameter has 5:0 bits for RX chain gain and bits 7:6 for RF gain.

    Regards,
    Vivek