Over-Sampled Sequence Detection for Jitter-Robust Serial Receivers
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Solution Overview
Problem
Traditional data receivers for high-speed serial links struggle with deterministic and non-deterministic jitter, leading to poor performance and high costs due to narrow tracking bandwidths, discarded data samples, and complexity issues with phase picking and Majority Voting methods.
Innovation Solution
An over-sampled sequence detector that analyzes sample sequences for different sampling phases, using look-behind and look-ahead information to improve detection reliability and utilize all available data, while dynamically adjusting equalizer parameters to reduce errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase picking with narrow tracking bandwidth is used to maintain stability and robustness, then deterministic jitter tracking is improved, but settling speed and capture range deteriorate
Solution Approach 1:
The patent implements dynamic tracking bandwidth adjustment where the receiver adapts its loop bandwidth based on operating conditions. During acquisition, a wider bandwidth enables faster capture and settling. During tracking, the bandwidth narrows to improve jitter rejection and stability. This dynamic adaptation resolves the contradiction between fast acquisition and stable tracking.
2Device complexity
If phase picking retains only one sample out of L over-sampled samples, then implementation complexity is reduced, but data detection reliability deteriorates due to discarded information
Solution Approach 1:
The patent merges phase tracking and data detection functions. Instead of discarding L-1 samples, the receiver uses all L over-sampled samples for both phase estimation and data detection. The phase information is extracted from the over-sampled stream, and then all samples are utilized for symbol detection, eliminating the trade-off between complexity and reliability.
3Stability of the object's composition
If narrow tracking bandwidth is used in phase pickers, then stability is improved, but the ability to track deterministic jitter deteriorates
Solution Approach 1:
The patent employs dynamic bandwidth adjustment that widens the tracking loop bandwidth when deterministic jitter is detected, enabling effective tracking of frequency offsets and phase variations. When the signal is stable, the bandwidth narrows to maintain stability and reject non-deterministic jitter. This dynamic behavior resolves the contradiction between stability and deterministic jitter tracking capability.
Data Source
AI summary
An over-sampled sequence detector operates on sampled data and tracks the detection reliability of the sampled data. The detector separately analyzes sample sequences for different sampling phases and then picks a sample sequence that allows for the most reliable detection. For the different sampling phases, the detector inspects some amount of look-behind and look-ahead information in order to improve upon simple symbol-by-symbol detection. The over-sampled information is used to further improve detection performance.