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AM1705 : How to suppress EMI

alpha
Expert 2530 points

Dear specialist

Our customer has been struggling to suppress EMI at EMIF 133MHz line.
They put damping resistor of 10ohm on EMB_CLK line but not pass EMI standard.
(Waveform is as below)

Could you please provide any advises about the above?

Best regards.

  • 0
    Expert 2530 points

    Sorry I forgot to attach waveform.

    Best regards.

     

  • 0
    TI__Mastermind 43660 points

    Hello Alpha,

    Generally the damping resistor would reduce the effect of EMI issue. Try change the resistor value to 22 ohms and check.

    Is the EMB_CLK signal routed properly with enough clearance to the adjacent traces ?

    How long is the EMB_CLK signal routed in PCB ?

    Are you using crystal or external oscillator for input clock ?

    Is the input source clock clean ?

    Have you followed the filtering guidelines provided for PLL ?

    Regards,

    Senthil