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DS110DF410 / llp48_pkg.s4p included in IBIS Model

Toshiyuki
Mastermind 7075 points
Other Parts Discussed in Thread: DS110DF410

Hi,

Our customer is simulating IBIS Model for DS110DF410. It turned out that the llp48_pkg.s4p insertion loss is as shown in the figure below.

Is the model correct?

Best Regards,

Kato

  • 0
    Mastermind 7075 points
    Hi,
    Please let me know if this pkg model is correct. Is this model performed actual verification?
    Best Regards,Kato
  • 0 in reply to Toshiyuki
    TI__Mastermind 29655 points

    Hi Kato-san,

    I took the llp48_pkg.s4p package model from the DS110DF410 IBIS-AMI package and looked at the SDD21 insertion loss. I obtained a much different result from yours:

    I expect the package loss to be minimal compared to trace or cable loss across a large frequency range. I also believe since this waveform is not purely linear that it was obtained through real data, just like the trace loss .s4p files that are used when simulating various trace lengths.

    Can you send the .s4p file for the 48-pin LLP package? I wonder if there is a difference between the one you are plotting and the one I am using.

    Thanks,

    Michael

  • 0 in reply to Michael Lu (Santa Clara)
    Mastermind 7075 points

    Hi Michael - san,

    Thank you for the reply. I‎'ve attached the .s4p file. I think S21@14GHz seem to be -4.97dB from the .s4p data.

    Best Regards,

    Kato

    llp48_pkg.zip

  • 0 in reply to Toshiyuki
    TI__Mastermind 29655 points

    Hi Kato-san,

    I ran the .s4p file you sent me in our software here to see the SDD21 behavior, and I got an identical waveform to the one that I sent in my previous post.

    Is it possible that when you ran simulation you were only looking at the S21 and not the SDD21 parameter? I believe the model was calculated with 4 ports that have 50-ohm terminations rather than 2 ports with 100-ohm differential terminations.

    If it is a 4-port (which I think it is), the value for SDD21 must be calculated.

    It should be as follows:

    SDD21=  0.5* (S21+S43-S23-S41)

    Thanks,

    Michael