RE: [SI-LIST] : Eye pattern with differencial signals.

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From: Salvador_Aguinaga@3com.com
Date: Mon Nov 06 2000 - 15:06:14 PST


Andrew,

According to Agilent (and using Agilent equipment), you may use a single probe.
      Connect
the probe tip to one of your +/- nets and the ground tip to GND. They do offer
differential probes, but they are not be high bandwith capable.

If one is looking at multi-Gigabit PECL signals are there benefits
to using a fast sampling oscilloscope vs. Agilent's 86100A with the
clock-recovery and 20GHz plug-in modules?

Thanks,
-- Sal

Sent by: "Ingraham, Andrew" <Andrew.Ingraham@compaq.com>

To: "si-list @silab.eng.sun.com" <si-list@silab.eng.sun.com>
cc: (Salvador Aguinaga/MW/US/3Com)
Subject: RE: [SI-LIST] : Eye pattern with differencial signals.

> I'm working with differencial signals (PECL), and I'll like to know how is
> the correct way to
> generate eye pattern.
> Could I use one of the signal at a time? or must be one minus the second
> signal and then generate the eye pattern?

It should be the same way your circuits use the signal.

If the receivers look at one signal of the pair, generate eye patterns that
way.

If the receivers are differential, take one minus the second and then
generate the eye pattern.

(A real differential circuit may behave somewhere between the two due to
imperfect CMR, but it ought to be closer to the second.)

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