Systems and methods for mitigating latency in a data detector feedback loop
AssigneeAgere Systems Inc.
InventorRatnakar Aravind Nayak
Life of this patent
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Abstract
Methods and systems for mitigating latency in a data detector feedback loop are included. For example, a method for reducing latency in an error corrected data retrieval system is included. The method includes performing an analog to digital conversion at a sampling instant to create a digital sample, and performing a data detection on the digital sample to create a detected output. The detected output is compared with the digital sample to determine a phase error. During an interim period, the digital sample is adjusted to reflect the phase error to create an adjusted digital sample. After the interim period, the sampling instant is adjusted to reflect the phase error.
Claims26
A data retrieval system, the circuit comprising:
- an analog to digital converter, wherein the analog to digital converter is operable to receive an analog signal and to provide a first digital signal corresponding to the analog signal at a first sampling instant;
- a data detector, wherein the data detector is operable to perform a data detection process on a derivative of the first digital signal to provide a modified data signal;
- an error determination circuit, wherein the error determination circuit is operable to compare the modified data signal with the derivative of the first digital signal to determine a first error indication;
- a first feedback loop, wherein the first feedback loop receives the first error indication and causes the analog to digital converter to provide a second digital signal corresponding to the analog signal at a second sampling instant, and wherein the second sampling instant is adjusted to reflect the first error indication;
- and
- a second feedback loop, wherein the second feedback loop receives the first error indication and adjusts the derivative of the first digital signal such that the error determination circuit determines a second error indication based at least in part on the adjusted derivative of the first digital signal.
A method for reducing latency in an error corrected data retrieval system, the method comprising:
- performing an analog to digital conversion at a sampling instant to create a digital sample;
- performing a data detection on the digital sample to create a detected output;
- comparing the detected output with the digital sample to determine a phase error;
- during an interim period, adjusting the digital sample to reflect the phase error to create an adjusted digital sample;
- and
- after the interim period, adjusting the sampling instant to reflect the phase error.
A data processing system, the data processing system comprising:
- a data receiving device, wherein the data receiving device derives an analog signal from a medium, and wherein the data receiving device further includes:
- an analog to digital converter, wherein the analog to digital converter is operable to receive the analog signal and to provide a first digital signal corresponding to the analog signal at a first sampling instant;
- a data detector, wherein the data detector is operable to perform a data detection process on the first digital signal to provide a modified data signal;
- an error determination circuit, wherein the error determination circuit is operable to compare the modified data signal with a derivative of the first digital signal to determine a first error indication;
- a first feedback loop, wherein the first feedback loop receives the first error indication and causes the analog to digital converter to provide a second digital signal corresponding to the analog signal at a second sampling instant, and wherein the second sampling instant is adjusted to reflect the first error indication;
- and
- a second feedback loop, wherein the second feedback loop receives the first error indication and adjusts the derivative of the first digital signal such that the error determination circuit determines a second error indication based at least in part on the adjusted derivative of the first digital signal.
Dependencies are inferred from the claim text.