Decision feedback equalizer and clock and data recovery circuit for high speed applications
First Claim
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1. A communications system comprising:
- a decision feedback equalizer adapted to reduce channel related distortion in received data, wherein the decision feedback equalizer is configured to generate equalized data; and
a clock and data recovery circuit coupled to the decision feedback equalizer, wherein the clock and data recovery circuit is configured to generate an extracted clock signal from the equalized data,wherein the decision feedback equalizer includes;
a retimer that is configured to generate recovered equalized data from the equalized data in response to the extracted clock signal; and
a multiplier coupled to the retimer, the multiplier being configured to apply an equalization coefficient to the recovered equalized data to generate an equalized feedback signal;
wherein the clock and data recovery circuit is configured to iterate the equalization coefficient until the clock and data recovery circuit synchronizes with a frequency of the equalized data.
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Abstract
A method for communicating data includes equalizing received data to reduce channel related distortion in the received data. A clock having frequency and/or phase fixed relative to the equalized data is extracted from the equalized data. The extracted clock is used to clock a retimer to generate recovered data.
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Citations
11 Claims
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1. A communications system comprising:
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a decision feedback equalizer adapted to reduce channel related distortion in received data, wherein the decision feedback equalizer is configured to generate equalized data; and a clock and data recovery circuit coupled to the decision feedback equalizer, wherein the clock and data recovery circuit is configured to generate an extracted clock signal from the equalized data, wherein the decision feedback equalizer includes; a retimer that is configured to generate recovered equalized data from the equalized data in response to the extracted clock signal; and a multiplier coupled to the retimer, the multiplier being configured to apply an equalization coefficient to the recovered equalized data to generate an equalized feedback signal; wherein the clock and data recovery circuit is configured to iterate the equalization coefficient until the clock and data recovery circuit synchronizes with a frequency of the equalized data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A communications system comprising:
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a decision feedback equalizer comprising; a summer that is configured to combine an equalized feedback signal with the received data, a slicer coupled to the summer, the slicer being configured to convert the combined signal to a binary signal, a retimer coupled to the slicer, the retimer being configured to generate recovered equalized data from the binary signal in response to an extracted clock signal, and a multiplier coupled to the retimer, the multiplier being configured to apply an equalization coefficient to the recovered equalized data to generate the equalized feedback signal, and a clock and data recovery circuit coupled to the slicer, the clock and data recovery circuit being configured to; generate the extracted clock signal from the binary signal; and vary the equalization coefficient based on a difference between a divided frequency of the extracted clock signal and a frequency of a reference clock. - View Dependent Claims (10, 11)
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Specification