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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?
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
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?
Hi Jiong,
I understand your issue only happens only on 2PCS.
You can also contact TI about the product returns. Please follow the below page's instructions.
Customer returns | Additional information | TI.com
Thanks,
Serkan