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US 9,191,245 B2Granted
Methods and systems for providing optimum decision feedback equalization of high-speed serial data links
AssigneeTektronix, Inc.
InventorKan Tan
Life of this patent
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Abstract
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.
Claims11
A system for optimizing equalization of a high-speed data link comprising:
- an input configured to receive an input waveform;
- a processor configured to perform multi-feedback coefficient decision feedback equalization (DFE) adaptation on the input waveform using n feedback coefficients, where n is greater than 1, the processor configured to:
- measure minimum and maximum voltage outputs associated with a specified horizontal position of a unit interval for n+1 bit patterns for the input waveform;
- determine optimal n feedback coefficients using the measured minimum and maximum voltage outputs;
- and
- generate and output a non-linear, equalized signal by applying the determined optimal n feedback coefficients to the input waveform,
- wherein the optimal n feedback coefficients are determined by:
- min
- z
-
- f
- T
-
- z
-
-
- such
-
-
- that
-
-
- {
- A
- ·
- z
- ≤
- b
- lb
- ≤
- z
- ≤
- ub
- where f, z, b, lb, and ub are vectors and A is a matrix, wherein each of f, z, b, and A are determined using at least one of eye height, the n feedback coefficients, and the maximum and minimum voltage outputs for the n+1 bit patterns, and lb and ub are determined using maximum and minimum values of the n feedback coefficient values and a constant.
31 more elements
A method for optimizing equalization of a high-speed data link comprising:
- receiving an input waveform to be processed through a multi-feedback coefficient decision feedback equalizer (DFE) with n feedback coefficients, where n is greater than 1;
- measuring minimum and maximum voltage outputs associated with a specified horizontal position of a unit interval for n+1 bit patterns for the input waveform;
- determining optimal n feedback coefficients using the measured minimum and maximum voltage outputs;
- and
- generating and outputting a non-linear, equalized signal from the multi-feedback coefficient DFE by applying the determined optimal n feedback coefficients to the input waveform,
- wherein the optimal n feedback coefficients are determined by:
- min
- z
-
- f
- T
-
- z
-
-
- such
-
-
- that
-
-
- {
- A
- ·
- z
- ≤
- b
- lb
- ≤
- z
- ≤
- ub
- where f, z, b, lb, and ub are vectors and A is a matrix, wherein each of f, z, b, and A are determined using at least one of eye height, the n feedback coefficients, and the maximum and minimum voltage outputs for the n+1 bit patterns, and lb and ub are determined using maximum and minimum values of the n feedback coefficient values and a constant.
30 more elements
Dependencies are inferred from the claim text.