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AFE7769: IABJ

JIONG QIU
Prodigy 30 points
Part Number: AFE7769

Tool/software:

When the TX_PLL of AFE7769 is set at 880MHz, a large power DC will be generated, and the QMC automatic calibration cannot go down, affecting the ACPR, this problem has a small probability, about 1/250, help to analyze what are the possibilities; In addition, is the library file version of AFE7769 still V2.20? Is there any update?

  • 0
    TI__Expert 6790 points

    Hi Jiong,

    Yes, the most up-to-date library is v2.20. Can you please elaborate your procedure for triggering the QMC?

    If you could send us your configuration file, we can check the file on our end.

    Thanks,

    Serkan

  • 0 in reply to Serkan Tokgoz
    Prodigy 30 points

    Hi，Serkan

    The configuration file is no problem.We have used 1000 pcs of our product, and only 2PCS have this problem.

    We have done ABA verification, and this phenomenon follows the chip.

    After the chip is powered on, the configuration file is loaded through SPI, and the initialization is normal, and then the QMC can not be corrected, only a few dB smaller than the main signal.

    Is there any analysis idea, is the chip internal problem or the external circuit has an impact on QMC calibration?

  • 0 in reply to JIONG QIU
    TI__Expert 6790 points

    Hi Jiong,

    I understand your issue only happens only on 2PCS.

    • Do you have a band pass filter in the Fb path? 
    • Please share your procedure while enabling TXIQMC.
    • I will send you register writes to reset the QMC, and we can check whether it converges after the register writes.
    • Can you please check the status of the QMC with CAPIs?
      • getTxIqmcLolConvergenceStatus(int fd, int chNo)

    You can also contact TI about the product returns. Please follow the below page's instructions.

    Customer returns | Additional information | TI.com

    Thanks,

    Serkan