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USB 2.0 mask for eye diagram

Question asked by mdivivo on Dec 21, 2011
Latest reply on Dec 21, 2011 by algoss

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Hello everybody,

We are trying to measure some USB signals on our PCB.
The system is very complex so we would like to understand if our signals are still good enough.
For example we are measuring a differential USB signal from an output port of a transceiver..both near the tx and far the tx (on the connector)...
We have a DSO 90804A so I want to know where can I find the USB mask ? Is it available or I need to install the USB 2.0 compliance test ?

Thanks to everybody

Regards,

Marco

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algoss Dec 21, 2011 5:32 AM
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Because of the nature of USB, building an Eye Diagram is non-trivial. If you are really interested in making accurate measurements, according to the USB spec, you should buy the USB Compliance SW, AND the USB Compliance fixtures. If you'd like to see how it's done, and why, you can read the compliance test manual, available here:http://cp.literature.agilent.com/litweb/pdf/N5416-97007.pdf

Al
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USB 2.0 mask for eye diagram

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