W2302EP Datasheet, PDF (21/26 Pages) Keysight Technologies – Quick Start for Signal Integrity

Modeling Crosstalk, Comparing Two Simulation
–– Save the pcie schematic file.
–– Delete the load termination at the far end of the cross-
talk channel (FEXT).
–– Replace it by copying and pasting the source termina-
tions that are on the input to the channel.
–– > Select
> Copy Ctrl-c > Paste Ctrl-v > Mirror
Then Click on the FEXT schematic location to place the
source terminations.
–– Connect the crosstalk transmitter to the FEXT location
with the new source termination.
Channel Simulator requires exactly one Tx component, but
you can add as many Xtlk2_Diff aggressors as you need.
–– From the Channel Simulator Palette, select the Diff Xtalk
transmitter.
–– Click Mirror About Y Axis
to flip the ghost image.
–– Select the Random radio button of the Phase Relative
to Tx setting of Xtlk2_Diff1 ► PRBS. We’ll compare
results with and without FEXT by saving the modified
version with a different name.
–– Push
into the Channel schematic symbol and
change the spacing (S[2]) between the differential pairs
from 20 mils to 7 mils to increase crosstalk on the CLin7
and CLin8 transmission line segments in the channel.
Pop back to the Fext schematic.
– From the schematic menu select File ► Save Design As...
and enter pcie_fext.
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