this paper is a follow-up of the paper published in 2011 IEEE EMC symposium, where a new type of far-end crosstalk cancellation for differential signal was proposed. Since then, various implementation schemes had been attempted in system designs. However, it turned out that due to routing constraints, the implementation on a production board can be very challenging. The authors will discuss what the challenges are and how we mitigate it. Furthermore, lab results will also be presented to demonstrate the effectiveness of crosstalk cancellation in products.

The paper introduces the usage of the differential symmetry principle to minimize or even cancel differential crosstalk. Applications to a CPU socket with hexagonal pin map pattern and to an edge connector are described. It is shown how a careful consideration of pin location and differential pair orientation can result in a high signal density and low differential crosstalk design.

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The effective equalization settings for a high speed differential channel with re-driver is a complex task, given the large number of silicon variables that can be tuned. Parameter sweep is prohibitive due to the multiple cases that imply a very long execution time. The screening and response surface design of experiments modeling are proposed in this paper as methods to keep the number of test cases to a practical minimum. The successful implementation in two different channels of a real system is shown in this paper. Low execution time and high accuracy of the prediction model are demonstrated.Index Terms-re-driver, high speed differential buses, design of experiments, screening, response surface modeling

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