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Disclosed is a method for symmetric routing with turning-point length compensation for high-speed differential signaling. Benefits include improved performance.
English (United States)
This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
74% of the total text.
Method for symmetric routing with turning-point length
compensation for high-speed differential signaling
Disclosed is a method for symmetric routing with turning-point
length compensation for high-speed differential signaling. Benefits include improved performance.
� � � � � Length mismatch is
caused by unsymmetrical routing designs for high-speed differential signaling.
The inputs and outputs of a differential
pair with different lengths causes delay mismatch and decreases
the eye opening. This problem is exacerbated when a designer uses
length-matching techniques without considering the coupled sections separate
from the uncoupled sections.
� � � � � Conventional
package/motherboard designers add extra trace length at a random location (see
Figure 1). This approach can create a very long mismatched segment.
� � � � � The disclosed method
is electrically symmetric routing with turning-point length compensation. The
method matches line lengths of coupled sections and matches the line lengths of
uncoupled sections separately to avoid the introduction of the even mode on an
odd mode signal. The uncoupled section is confined at the turning point of the
routing. The disclosed method compensates for the trace length at the turning
point, minimizing the mismatching section of the differential trace pair (see
� � � � � Some implementations
of the disclosed structure and method provide one or more of the following