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FPD-Link: Key spec for oscilloscope to get eye-diagram

RYO
Intellectual 2000 points


Hello all,

I would like to know the key specs for oscilloscope to get eye-diagram in order to see the quality of data transmission at FPD-Link. When using the device of FPD-Link III, the data transmission speed is around 3Gbps at max. I assume that the oscilloscope bandwidth should be 6-10GHz at least. Is this correct?

Also, are there any other key specs for this?

Best regards,
RYO

  • 0
    TI__Mastermind 19720 points
    We recommend that the scope you use to capture an eye diagram has a bandwidth of at least 3 times the frequency of the fundamental of the Signal to capture the third harmonic of the signal. so for a 3Gbps the fundamental frequency is 1.5 GHz so the scope you should use should have at least 4.5 GHz of bandwidth or 6 GHz if you want to capture the fourth harmonic. You also might want to look at the voltage range of the signal that you are trying to view and the voltage range of the scope to see if they are compatible.
  • 0 in reply to Michael.Walker
    TI__Intellectual 2000 points

    Hi Micahel,

    Thank you so much for your explanation. I have one more question. Are there any methods to measure the quality of transmission other than eye-diagram?

    Thank you,
    RYO

  • 0 in reply to RYO
    TI__Mastermind 19720 points
    Another test is Transmitter Jitter test that will test a transmitters amount of Deterministic Jitter(DJ) and Random Jitter(RJ). Those two are all the tests that you should need for a transmitter. There are RX tests as well like bit error rate test and jitter tolerance test.