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AFE7769D: Inquiry about DPD

Seunghyun Choi
Prodigy 10 points
Part Number: AFE7769D

Tool/software:

We are using AFE7769D and Icana ICASD4450-D2S, ICASD4450-S2D.

When we triggered DPD with dpd model 4044, there is some EVM fluctuation by about 0.5% periodically. I think that's because of feedback signal. 

I'd like to know how to debug and take actions. And are there any other DPD model I can use?

  • 0
    TI__Guru 72329 points

    Hello Mr. Choi

    I would recommend firstly to run through the document SBAU405A - section 6.5.1. (Pre DPD trigger check list) to ensure all the signal levels are correct. There are other debug procedures in the document as well. We need to ensure the DPD in and DPD output are set to the optimal level.

    Please download the document from TI's MySecureServer:

    https://www.ti.com/secureresources/AFE7769D-DESIGN

    -Kang

  • 0 in reply to Kang Hsia
    Prodigy 10 points

    Dear TI Support Team,

    Thank you for your assistance. I am currently working on board characterization for a specific use case and need to sweep through different DPD corrector models provided by TI for “AFE7769D - SBAU405A - section 6.5.1”.

    Could you please provide the sequence for the DPD corrector model sweep? Additionally, I would like to confirm which DPD model can be used based on measured performance parameters.

    Do you have any documentation explaining and tuning the DPD models provided by TI for the AFE7769D? If so, could you share it with us?

    Regards,

    Tuan Le Anh