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WL1835MOD: SoC Limits setting on the RTTT test application

Ganesh skandha
Intellectual 450 points
Part Number: WL1835MOD

Hi,

I am measuring the peak power of WL1835MOD with the TI SDMMC adaptor board, with fw version 4 and the WL1835MOD_INI.ini as the configuration setting and RTTT as the testing tool. I notice almost 6dB difference in power level when SoC limits check box is enabled vs when that is disabled and the power level matches to the FCC test reports maximum conducted power only when the SoC limits are disabled.

When I use calibrator tool on my board with the same INI and fw version, the power levels only match the conducted power levels when SoC limits are enabled.

I would like to know, whether SoC limits were applied or not during the FCC testing of this product and how to ensure that the same settings are followed on my board. 

Also is there a way to configure SoC limits using "calibrator" tool ?

Also any insight on what this SoC limits in the RTTT means and what are the limits set on the firmware for each channel will be really helpful. Thanks a lot!

Thanks

 

  • 0
    TI__Mastermind 29250 points
    Hi,

    This query has been assigned to a relevant expert. We will get back to you soon.

    Best regards,
    Vihang
  • 0
    TI__Genius 12260 points
    Hi Genesh,

    You can refer to the RTTT user's guide for additional information on the RTTT tool. It can be found at: www.ti.com/lit/pdf/swau085.

    Section 5.2 explains the setting used for regulatory testing, where the SoC Limits is selected to ensure you are using the .INI file as for power limits. in doing so you also need to ensure that you select dBm and the value of 30. If you select dBPSat, with a number, this is the back off and not the actual power you will be setting. This information about the back-off can be found in the .INI application note that can be found at: www.ti.com/lit/pdf/swru422.

    The SoC were applied during FCC testing (basically we use the .INI file as our limits).

    Using the calibrator tool, you can also ensure that you are setting the power limits based on the .INI file. information about the calibrator tool can be found at: processors.wiki.ti.com/.../WL18xx_TX_Testing.

    There is a channel_limitation option that allows you to use limits from the .INI file or not.

    I hope this helps.

    Thanks,
    Riz
  • 0 in reply to Rizwan Murji
    Intellectual 450 points
    Hi,
    Just for me to understand, SoC limits is the setting for BO of Power amplifier and that has nothing to do with the firmware ?
    Or the firmware has some way to limit the power apart from the Channel limits and the BO limits ?
  • 0 in reply to Ganesh skandha
    TI__Genius 12260 points
    Hi Ganesh,

    When you set SoC, it is in a way using the FW as it looks at the .INI file for the output power limits. In the .INI file power can be limited (or set) in to ways. One is by a dB adder to a fixer power level, or BO fro PSAT. So in the RTTT tool, that is what you see, 2 buttons to allow you to set the power accordingly. When you select SoC, it means that if you try from the RTTT tool to set the power higher than what is allowed by the .INI file, it will not allow you to do that and you will limit output power to the max in the .INI file. If SoC is unchecked, you can go higher.

    Hope this helps

    Thanks,
    Riz