[SI-LIST] Re: Eye width for microstrip and stripline configuration in PCIE gen2 simulation.
- From: Joseph.Schachner@xxxxxxxxxxxxxxxxxx
- To: maxsidhu@xxxxxxxxx
- Date: Thu, 21 Feb 2013 13:00:31 -0500
microstrip, because it is not sandwiched between ground planes, is more
susceptible to crosstalk than stripline. Cross talk might be the cause of
more eye closure with microstrip.
Another likely cause is that with microstrip the electromagnetic field
exists both above the microstrip (in the air) and below it (in the
substrate). That non-homogeneous medium makes the dielectric constant
vary with frequency which means it is dispersive - the phase velocity
decreases with increasing frequency. That pulls fast edges apart. And,
the characteristic impedance changes with frequency ... I don't remember
exactly how to describe that. These effects can be small depending on
usage, but one thing is certain: they will contribute to eye closure for
microstrip and they basically do not exist for stripline.
Insertion loss is not the only thing that needs to be considered.
--- Joe S.
From: Siddharth Rajagopalan <maxsidhu@xxxxxxxxx>
To: si-list@xxxxxxxxxxxxx, "Moran, Brian P" <brian.p.moran@xxxxxxxxx>
Date: 02/21/2013 11:24 AM
Subject: [SI-LIST] Eye width for microstrip and stripline
configuration in PCIE gen2 simulation.
Sent by: si-list-bounce@xxxxxxxxxxxxx
Dear experts,
I am currently working on a PCIE gen2 simulation. I am evaluating both the
microstrip and the stripline configurations.As expected, the stripline
configuration yields more insertion loss than the microstip one. This
however is not reflected in the eye diagram since the stripline has a
better eye width than the microstrip one. I was of the understanding that
higher insertion loss manifests itself as higher rise time degradation in
the time domain. I might exposing my ignorance in the previous statement.
kindly help me clarify this.
Thanks,
siddharth rajagopalan
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