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Method for symmetric routing with turning-point length compensation for high-speed differential signaling

IP.com Disclosure Number: IPCOM000016502D
Publication Date: 2003-Jun-25
Document File: 2 page(s) / 34K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for symmetric routing with turning-point length compensation for high-speed differential signaling. Benefits include improved performance.

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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.

Background

        � � � � � 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.

Description

        � � � � � 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 Figure 2).

Advantages

        � � � � � Some implementations of the disclosed structure and method provide one or more of the following advantages:�

•        � � �...