Interleaved Receiver Equalization via Spectral Mismatch Detection
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Solution Overview
Problem
High-speed data systems with interleaved paths suffer from linear offset and gain mismatch errors, bandwidth mismatches, sampling pulse-width mismatches, and intersymbol interference, which affect data accuracy and increase Bit-Error-Rate due to passive and dynamic sampling effects.
Innovation Solution
A high-speed data receiver is designed with interleaver circuitry, spectral content detection, sorting, and equalization circuitry to identify and correct path offsets, gain mismatches, and signal width mismatches using spectral analysis and adjustment of gain and pulse width actuators, with methods including normalization and polynomial fitting to equalize interleaved paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If interleaved data paths are used to increase throughput, then bandwidth and productivity are improved, but mismatches between paths cause errors and reduce reliability
Solution Approach 1:
The patent implements a feedback mechanism where spectral content is continuously monitored and analyzed to detect mismatches between interleaved data paths. The system measures spectral characteristics, compares them against reference values, and automatically adjusts path characteristics (such as delay, gain, or frequency response) to correct detected deviations. This closed-loop feedback ensures that throughput is maintained while reliability is preserved through automatic error correction.
Solution Approach 2:
The system dynamically changes parameters of the interleaved paths based on spectral analysis results. When mismatches are detected, the system adjusts parameters such as path delay, amplification factors, or filtering characteristics to equalize the paths. This parameter adjustment allows the system to maintain optimal performance across varying operating conditions while preventing error accumulation.
2Measurement precision
If spectral analysis is performed to detect mismatches, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential spectral features needed for mismatch detection rather than performing complete spectral analysis. The system identifies and measures specific spectral characteristics (such as peak frequencies, bandwidth, or energy distribution in key frequency bands) that are most indicative of path mismatches. This selective extraction maintains high measurement precision while significantly reducing the computational and hardware complexity compared to full-spectrum analysis.
Solution Approach 2:
The spectral analysis function is divided into multiple independent stages: signal acquisition, spectral transformation, feature extraction, mismatch detection, and correction control. Each stage can be implemented with dedicated simple circuitry rather than a single complex processing unit. This segmentation allows the system to achieve high measurement precision through cumulative processing while keeping individual components simple and manageable.
Data Source
AI summary
A high-speed data receiver includes interleaver circuitry configured to divide a received data stream into a plurality of interleaved paths for processing, spectral content detection circuitry configured to derive spectral content information from data on each of the plurality of interleaved paths, sorting circuitry configured to bin the derived spectral content information according to energy levels, stream attribute determination circuitry configured to determine, based on sorted spectral content, one or more of path offsets of the interleaved paths, gain mismatch among interleaved paths, signal bandwidth mismatch and pulse width mismatch, and equalization circuitry configured to correct the one or more of the determined offsets, the determined gain mismatch and the determined signal width mismatch. Equalization circuitry may be configured to equalize a gain-normalized signal by separately adjusting respective bandwidth actuators of each respective interleaved path and respective pulse width actuators of each respective interleaved path.