[SI-LIST] IBIS simulation LVPECL
- From: Bob Tarasewicz <Bob.Tarasewicz@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 3 Oct 2008 09:42:31 -0500
My simulations of an LVPECL net (apprx 3" long, 'Y' terminated just beyond
receiver) do not seem to be correlating at all with in-lab measurements.
In the past I've had very good luck with simulations agreeing pretty well
with actual scope measurements; however, this is my first experience
simulating LVPECL. Is there a fundamental reason why perhaps IBIS models
won't model the behavior of LVPECL accurately? Or is it that the faster
edge rate of LVPECL is highlighting flaws/limitiations in my simulation
methodolgy and/or tool?
Simulations "at the pin" as well as "at the die" show nice rising/falling
edges at the receiver. However, scope captures with a good diff probe
show a 'step' in the rising/falling edge at the receiver. The 'step'
looks like what one would expect halfway down a series-terminated net; not
sure why I'm seeing a 'step' with an end-terminated net.
Any guidance would be apprecitated.
Bob Tarasewicz
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