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公开(公告)号：US11909565B2
公开(公告)日：2024-02-20
申请号：US17879611
申请日：2022-08-02
IPC分类号： H04L25/03
CPC分类号： H04L25/03057
摘要： Decision feedback equalization (DFE) is used to help reduce inter-symbol interference (ISI) from a data signal received via a band-limited (or otherwise non-ideal) channel. In embodiment, a single-ended receiver trains DFE coefficients and the slicer reference voltage to improve the received eye height. The process for training avoids many whole range sweeps thereby shortening training time. A custom data pattern that includes low-frequency (DC with respect to DFE) and high-frequency (AC with respect to DFE) worst cases is used for training in a closed loop manner. Negative DFE is used to measure the AC height of the data. Positive DFE is used to find the DC height of the data pattern.
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公开(公告)号：US11810633B2
公开(公告)日：2023-11-07
申请号：US17460701
申请日：2021-08-30
发明人： Ashwin S. M. , Anirudha Shelke , Navin Kumar Mishra , Phalguni Bala , Younus Syed , Kiran Baby , Sudhir Kumar Katla Shetty
CPC分类号： G11C29/36 , G11C7/22 , G11C29/50004 , G11C2207/2254
摘要： In a receiver having at least a first equalizer and a sampler, a calibration module jointly calibrates a reference voltage and one or more equalizer coefficients. For each of a set of test reference voltages, an equalizer coefficient for the first equalizer may be learned that maximizes a right eye boundary of an eye diagram of a sampler input signal to a sampler of the receiver following the equalization stage. Then, from the possible pairs of reference voltages and corresponding optimal equalizer coefficients, a pair is identified that maximizes an eye width of the eye diagram. After setting the reference voltage, the first equalizer coefficient may then be adjusted together with learning a second equalizer coefficient for the second equalizer using a similar technique.
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