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IWR6843: IWR6843

? ?
Prodigy 40 points
Part Number: IWR6843

Tool/software:



I have used the IWR6843 radar to meet the EN 305 550 standard, where the out of band domain limit is -20dBm/MHz. The measured power density of my radar is -6dBm/MHz. The reason is that the radiation power of the chip cannot be rapidly reduced at FH FL. Do you have any solutions from TI?
My actual measurement chart is as follows: clearly exceeding -20dBm/MHz. However, after reviewing the certified image of TI's DEMO board, I found that TI's certification selection of FH FL conflicts with regulations. EN305550 explicitly requires the captured frequency point to be at 99% of the operating frequency, but the frequency point of the door in TI's report is -30dB. Isn't this correct???

（My actual measurement chart）

（TI　ｄｅｍｏ）

（EN305550 requirements）

  • 0
    TI__Expert 4280 points

    Hi, 

    How are you determining the 99% BW? Are you using your scope's 99%OBW function as described in EN 303 396 (as cited by EN 305 550)? This is the most common way to determine your OBW. 

    Some tips can be found in our Regulatory Compliance Overview (https://www.ti.com/lit/an/spracp3c/spracp3c.pdf)

    Thanks!

    Blake

  • 0 in reply to Blake Kisshauer
    Prodigy 40 points

    yes,The testing organization uses a spectrum analyzer with 99% OBW functionality to select the FHFL frequency point.

  • 0 in reply to Blake Kisshauer
    Prodigy 40 points

    IWR6843demo uses the -23dBc bandwidth selection of FH FL, and our laboratory does not accept this selection rule. You can see that there is an almost 23dB difference in power between the 99% OBW and the -23dBc bandwidth selected frequency points. Therefore, my board's radiation exceeds the standard very seriously, and I would like to ask if you have any solutions.

  • 0 in reply to ? ?
    TI__Expert 4280 points

    Hi, 

    The regulatory guide doesn't state a rule, merely a guide or explanation. EN  305 550 refers to EN 303 396 section 6.3.2 permits the use of the 99%OBW test as one method for measuring the OBW. It also permits using the test method described in section 6.3.4.2 (recorded results from mean power measurement. 

    This method may work better for you. 

    Alternatively, as mentioned in the regulatory guide, you could reduce the BW slightly or increase the TX start time slightly. 

    Thanks!

    Blake