[SI-LIST] Jobs Opening
- From: Patrick Lam <plam@xxxxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 17 Apr 2003 12:09:02 -0700
can experience an issue some call "switching into an unfinished edge", =
which can create discontinuities in the output waveforms of some =
simulators. The right answer is probably to speed up the buffer, but in =
the mean time, I have 3 choices to weigh. 1) I can just leave the VT =
curves longer than the stimulus would normally dictate and let the =
simulator deal with it, 2) I could clip off the trailing edge of the VT =
curves, in which case they would not reach actual steady state level, or =
3) I can scale the VT curve's slope in order to fit the window. I guess =
I'm weighing 1 vs 3. I know scaling the VT will distort the model, which =
isn't good, but it is deterministic. The first option maintains the =
correctness of the model, but is less deterministic to my way of =
thinking, becasue I don't know how it effects various simulators. I'd be =
curious if anyone has been in this situation and done any type of =
analysis of the relative impact of either approach on simulation =
accuracy, or how various simulators react to the unfinished edge =
phenomenon. This is probably a philosophical rat hole, but I was hoping =
someone might have a piece of insight I had not thought of, or a =
workaround I had not considered. =20
Brian P. Moran
Signal Integrity Engineer
Intel Corporation
brian.p.moran@xxxxxxxxx
-----Original Message-----
From: Aaron Helleman [mailto:aaron.helleman@xxxxxxxxxxx]
Sent: Wednesday, April 16, 2003 2:25 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Measuring Crosstalk
What's the standard way to measure crosstalk in the lab? We have
experimentally determined that there is crosstalk on our PCB due
to traces being too close together for an xDSL system on the analog
side. We want to characterize the amount of crosstalk between two
'bad' ports vs. two 'good' ports
to determine if our respin will work properly in simulation.
The frequency band of interest is between DC and 1100 KHz, which seems
like it should not be succeptable to crosstalk very much, but we have
experimentally determined
that if we re-route the tracks of interest using rework wire we can make
the crosstalk go away.
Hi All
Optimal Corp. has several openings for SI-related software development and
sales. Please visit www.optimalcorp.com if you are interested.
Patrick
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