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IWRL6432: Transmit power across the band with 23 dB backoff

Thomas Karlinsey
Prodigy 30 points
Part Number: IWRL6432

Hello,

We have measured the transmit power of the IWRL6432 on our board with the full 7GHz bandwidth and with the backoff set to the maximum 23dB. According to our measurements, the power level is not very flat: 

We have tested with the backoff set to 0 dB and it is much flatter.

Does this match your expectations? It is possible that there is a problem with our measurements. 

Thank you

  • 0
    TI__Intellectual 2410 points

    Hi Thomas, 

    I have a few quick questions to ask: 

    • Could you provide the center frequency and BW of your antennas? 
    • Could you describe your measurement and device set up? 
    • Do you anticipate needing to operate with a 23 dB backoff? 
  • 0 in reply to Blake Kisshauer
    Prodigy 30 points

    Hi Blake, 

    Thank you for the follow up on my question. We are unsure what backoff we will need. It appears that 10 dB backoff may be sufficient. We have not tested the flatness of the power spectrum with 10 dB backoff. Do you expect that it would be similar to the power spectrum with 0 dB backoff? 

    We are measuring the power spectrum with a horn antenna, an amplifier, and a spectrum analyzer. We have tested with different amplifiers to verify that the slope was not cause by the amp. 

    The current version of the antenna on the device is not broadband, but the difference between the 0dB back off and the 23 dB back off is what I am wondering about. Here is the power spectrum with 0dB backoff: 

    and here it is with 23dB backoff: 

    With only 10dB backoff this will probably not be a problem, but I wanted to know what to expect. 

    Thanks,

    tk

  • +1 in reply to Thomas Karlinsey
    TI__Intellectual 2410 points

    Thomas, 

    We do expect to see some droop at high backoffs which will get worse as backoff is increased to maximum. But do keep in mind that this effect can be exaggerated by the bandwidth and center frequency of your PCB antennas as well as the particulars of your measurement set up. 

    Let me know if you intended to operate in a region that you are concerned about this droop. 

    Thanks,

    Blake