While exporting to free form schematic, there is an option for export coupled segments. What is the use of this option??.. What happens if that option remains deselected and proceed further?
During the analysis of signal integrity you want to know how a signal is disrupted or does disrupt other neighboring signals.
HL uses an approach to determine which signal count as neighbor with the length of a trace being near another trace. In this length, that can be set by the tool settings, you determine that the space between two signals is so close that there is an influence of one signal on the other.
You can set this up with the following settings:
When you select the trace, it will show you which signal, are recognized as neighbors.
So when you export the selected signal, if you choose not to include the coupled signals, only the selected trace will be exported to the free hand line editor. in this example like this:
You can do a simulation and get the resulting shape of signals, delays, distortions and more. But you have evaluated only the signal as if it would be all alone on the board.
In reality the board is filled with other signals, that may or may not affect the simulation.
Including the coupled signals, the free hand line editor, will show you the complex environment where the signal is in (note that the signal is in the green box, the other snngals are influencing the signal)
You see now that you can repeat all previous simulations, this time assessing what other signal effect on it, and how it effects other signals. This is the true and complex analysis you may want to do, to be sure that you take into account more factors, than the simplified first export.
Hope this helps
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