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extracting jitter from an eye diagram

svilen

Hi,

I have a PRBS data signal from which I plot the eye-digram. So, this signal is strictly speaking not periodic. I need to find a way to extract total jitter from that eye-diagram (the width at the crossing point in the eye-diagram). I don't need to just simply go to viva, plot the eye-diagram and measure with the cursors the width. I need to integrate this measurement in an script (ocean script perhaps). Is there a function that can do all this? Or maybe a procedure that can be put in a script? Or even maybe a way to plot the jitter histogram at the crossing point of the eye-diagram? I'm using IC616-64b.500.132.

Thanks in advance.

Svilen

Parents

  • Dear Svilen,

    > I need to integrate this measurement in an script (ocean script perhaps). Is

    > there a function that can do all this?

    The cross() function might be your best option as you can measure the time between the threshold crossing of each data pulse and the ideal location of the respective threshold crossing. You know the ideal threshold crossing function from the data pattern you are supplying.

    This will provide you with all the threshold crossing errors (analogous to the set of time interval errors for a clock signal). I assume this raw data can be used in whatever specific calculation you want to perform.

    I hope this helps Svilen,

    Shawn

Reply

  • Dear Svilen,

    > I need to integrate this measurement in an script (ocean script perhaps). Is

    > there a function that can do all this?

    The cross() function might be your best option as you can measure the time between the threshold crossing of each data pulse and the ideal location of the respective threshold crossing. You know the ideal threshold crossing function from the data pattern you are supplying.

    This will provide you with all the threshold crossing errors (analogous to the set of time interval errors for a clock signal). I assume this raw data can be used in whatever specific calculation you want to perform.

    I hope this helps Svilen,

    Shawn

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