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DP83TC811S-Q1: EMC RI test, DP83TC811S-Q1 can't work in 700MHz to 1GHz

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Part Number: DP83TC811S-Q1

Dear TI:

   When the customer conducts EMC RI test, dp83tc811s-q1 is disturbed in the range of 700MHz to 1GHz and cannot work.The failure phenomenon is that the customer's LTE module tries to communicate with dp83tc811s-q1, but the 811S has no response.When the customer modified part of the circuit, the interference phenomenon was improved, and the frequency point of interference was reduced to between 800MHz and 900MHz.The modified circuit is R1702/R1705 changed from 27 ohms to 36 ohms.Please help to confirm which circuits need to be modified for this problem, or what can be improved?

    The customer has tested three boards in total, and the phenomenon is consistent.


    Below is the circuit diagram of the customer:

  • Hi Eric,

    Can you provide more details about the phenomenon? Diagram of your test setup would be helpful. When DP83TC811 has no response, what is not working (register access, no link ...)?

    Can you also provide the result plot over frequency range?

    Regards,

    Hung Nguyen
  • In reply to Hung Nguyen92:

    Hi Eric,

    Since there is no response from you, I will go ahead and close this thread.

    If you need further support, please kindly open a new thread.

    Regards,

    Hung Nguyen

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