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Methods and systems for providing optimum decision feedback equalization (DFE) of high-speed serial data links

A high-speed data and link technology, applied in the direction of digital transmission system, baseband system, transmission system, etc., can solve the problems of low calculation efficiency, DFE does not produce results, etc.

Active Publication Date: 2016-01-27
TEKTRONIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors have found that this form of DFE does not produce accurate results and is computationally inefficient because it requires many data points to be analyzed

Method used

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  • Methods and systems for providing optimum decision feedback equalization (DFE) of high-speed serial data links
  • Methods and systems for providing optimum decision feedback equalization (DFE) of high-speed serial data links
  • Methods and systems for providing optimum decision feedback equalization (DFE) of high-speed serial data links

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Embodiment Construction

[0032] In accordance with the present invention, an exemplary embodiment of a DFE that utilizes an explicit adaptation method rather than an exhaustive search method to identify optimal DFE taps or feedback coefficients based on a peak-to-peak based criterion is presented. The explicit adaptation method provides a closed-form solution (ie, calculates optimal tap coefficient values ​​directly rather than iteratively). Such a DFE follows the behavior of the model DFE defined in the PCIE3.0 specification.

[0033] back to reference figure 2 , a receiver-based model DFE extracts an analog output signal x from a continuous linear equalizer (CTLE) k , and output a balanced analog signal yk and digital signal y * k ,in:

[0034] (1)

[0035] (2)

[0036] and where, y k can be modeled as the summed differential output voltage of the DFE, y * k is modeled as a decision function output voltage, x k is modeled as a DFE differential input voltage, d 1 is modeled as a tap o...

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Abstract

The invention provides methods and systems for providing the optimum decision feedback equalization (DFE) of high-speed serial data links. Computationally efficient methods and related systems, for use in a test and measurement instrument, such as an oscilloscope, optimize the performance of DFEs used in a high-speed serial data link by identifying optimal DFE tap values for peak-to-peak based criteria. The optimized DFEs comply with the behavior of a model DFE set forth in the PCIE 3.0 specification.

Description

[0001] related application [0002] This application is related to and claims U.S. Provisional Application No. 62 / 026,408, filed July 18, 2014, and co-pending, commonly assigned U.S. Nonprovisional Patent Application No. 13 / 326,753, filed December 15, 2011 (which claims the Priority benefit of Provisional Application No. 61 / 450,542 filed March 8) and each of the above-referenced applications is hereby incorporated by reference as if fully set forth herein. This application is also related to U.S. Patent No. 8,374,231, filed April 14, 2009, assigned to the same assignee as this application, and the contents of U.S. Patent No. 8,374,231 are hereby incorporated by reference as if fully set forth herein explained the same. To the extent any disclosure in US Patent No. 8,374,231 conflicts or appears to conflict with the disclosure of this specification, the disclosure of this specification shall take precedence and control the resolution of any such conflict. Background technique...

Claims

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Application Information

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IPC IPC(8): H04L25/03
CPCH04L25/03146H04L2025/03757
Inventor 谈侃
Owner TEKTRONIX INC