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Disclosed is a method of checking the routing of differential
signals in electronic packages in a quick yet thorough
English (United States)
This text was extracted from a PDF file.
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This is the abbreviated version, containing approximately
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Method for Systematic Evaluation of Differential Pair Routing Through an Electronic Package
A growing percentage of the high speed signaling needed in current electronic systems is utilizing differential interfaces. The routing of differential signals in electronic packages becomes very important at higher frequencies and lower voltages. If differential traces are routed where the traces do not see consistent medium, noise may be introduced which cuts into the voltage margin of the signal. If the differential traces have segments which vary in length, jitter may be introduced, which cuts into the timing margin of the signal. The current solutions mostly involve manual checking of the differential traces. The drawback of this solution appears as the number of pairs to be checked increases. An automated checking mechanism will allow these discrepancies to be identified quickly and corrected early in the physical design cycle.
The invention proposed here is a method to very quickly, through automated means, assess the routed path of differential pairs of signals. The physical design data is read into a computer program and all of the physical features are evaluated for proximity and consistency in the medium in which they are routed. The program will look at all signal traces, vias, pins, other structures and highlight areas of inconsistencies. This information may be used to identify traces which differ from their corresponding pair and the design may be modified to correct these discrepancies.
The flowchart depicted in Figure 1 shows the invention...