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IWR1443: IQMM Calibration is Failing

Michael Linden
Intellectual 375 points
Part Number: IWR1443

Hi Shankar:

  Please consider this a continuation of the locked forum thread linked below due to my being "redirected" for some time (sorry about that)...

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1041014/iwr1443-what-sort-of-operational-problems-should-i-expect-if-rx-iqmm-calibration-is-failing/3941468?tisearch=e2e-sitesearch&keymatch=iqmm#3941468

  Before we continue, I was told some time back that the only problem we might have using the system without the IQMM calibration is that we wouldn't be able to do noise detection. We did not consider this to be a problem because we do not intend to do noise detection.

  However, I'd also like to know if the lack of IQMM calibration could cause the amount of baseline noise to differ between systems that are identically configured. We have noticed that some of the systems exhibit differing amounts of baseline noise even though they are being operated at the same gain settings. Could this be caused by the lack of IQMM calibration?

  Thanks, Michael

  • +1
    TI__Mastermind 39725 points

    HI, Michael:

    The IQMM calibration is required for phase shifter calibration.   I remember that your system does not use phase shifter either.  So you should be fine.   

    Regarding the baseline noise,  RX gain calibration can introduce bigger variation in RX gain.  But the SNR (signal to noise ratio) difference should be much smaller.  Can you check both the noise level and the signal level, and see whether the SNR is similar between different device.

    Best,

    Zigang 

  • 0 in reply to zigang Yang
    Intellectual 375 points

    Hi Zigang:

      Thanks for your confirmation regarding RX IQMM.

      We believe our baseline noise variations are being caused by assembly issues. We do not believe that the IWR1443 or its firmware are causing the issue.

      Thanks! -Michael

  • 0 in reply to Michael Linden
    Intellectual 375 points

    Since we don't need RX IQMM, I do not plan to pursue an understanding of why it does not succeed in our application.

    Thanks! -Michael