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Eye Diagram Plot Zoom In Problem

FiratCelik

Hello,

Right now I am working on a transceiver and I need to measure the eye openings precisely. However when I zoom in in the eye diagram plot, it shows different lines that do not exist in zoomed out version of the diagram. If I zoom in very much, it shows a lot of lines which makes the eye completely closed. I think that these lines that are generated are not real because I cannot put a marker on them. Also, when I use eye aperture function from the calculator, it shows an opening considering the zoomed out eye diagram.

My question is that, how can I be sure that there is no fake lines with a certain zoom scale so that I can measure the eye opening properly?

Thank you.

Firat

  • Firat,

    I'm unaware of such an issue. It would be better if you provided information about the subversion of virtuoso you're using (as suggested in the Forum Guidelines) and ideally some pictures to show what the problem is that you're talking about.

    Kind Regards,

    Andrew.

  • in reply to Andrew Beckett

    Hi Andrew,

    Subversion IC6.1.7-64b.500.17

    I am also attaching some pictures. The first one is the original version. The second one is zoomed in to one of the eyes (still no additional line). The third one is what happens when I continue to zoom in (ctrl + wheel up). If I zoom more, it becomes worse. After some point it even closes the eye.

    Best regards,

    Firat

  • in reply to FiratCelik

    This seems to be a bug with eye diagrams plotted with "Intensity" turned on. Plot it without that and you'll be able to zoom in OK.

    I suggest you report this to customer support and ask for a duplicate of CCR 1677639 to be filed (I found a report of it).

    Regards,

    Andrew.

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