Wireline Receiver Timing Using Multi-Threshold Phase Sampling
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Solution Overview
Problem
Existing wireline receivers face challenges in accurately sampling and timing high-speed signals, leading to suboptimal performance and reduced margins.
Innovation Solution
The wireline receiver incorporates a sampler block, phase detection circuits, and clock circuits to enhance timing and margin performance by using multiple threshold levels and phase shifting to improve signal sampling and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single threshold level is used for sampling high-speed signals, then the device complexity is reduced, but the timing accuracy and signal margins deteriorate
Solution Approach 1:
The sampling process is segmented into multiple operations: a data sampler samples at a first threshold level to generate data signals, while first and second edge samplers sample at second and third threshold levels respectively to generate edge signals. This segmentation of sampling functions across multiple threshold levels improves timing accuracy without requiring a single complex sampling mechanism
Solution Approach 2:
The patent introduces a temporal dimension to the sampling process by using multiple threshold levels (first, second, third thresholds) across different time points. The base phase detection circuit uses data signals from the first threshold and edge signals from the second and third thresholds to determine timing control signals, effectively adding a dimensional approach to timing measurement
2Reliability
If traditional single-phase sampling is used, then the device complexity is minimized, but the timing margins and synchronization performance worsen
Solution Approach 1:
The system dynamically adjusts timing by using a base phase detection circuit that processes data signals and edge signals to generate timing control signals. The timing control signals dynamically adjust the phase of sampling clocks to optimize sampling moments, improving timing margins through dynamic adaptation rather than static single-phase sampling
Solution Approach 2:
The phase detection circuits receive feedback from data samplers and edge samplers, processing the sampled signals to generate timing control signals that feed back to the clock circuits. This feedback loop enables continuous optimization of sampling timing, improving reliability through adaptive timing adjustment
3Measurement precision
If multiple threshold levels and phase detection circuits are implemented, then timing accuracy and signal margins are improved, but the device complexity increases
Solution Approach 1:
The sampling circuits are designed with multi-functionality: data samplers can operate with different clock signals for different data rates, edge samplers detect both rising and falling edges, and phase detection circuits process multiple signal types. This universality allows the same hardware structure to handle various sampling requirements, reducing the impact of increased complexity
Data Source
AI summary
A wireline receiver with improved timing and related margins, may comprise a data sampler, a first edge sampler, a second edge sampler, a base phase detection circuit, an additional phase detection circuit, a clock circuit and a phase shifting circuit. The data sampler, the first edge sampler and the second edge sampler may, when triggered by a data clock, a first edge clock and a second edge clock respectively, sample and compare a receiver signal to determine whether the receiver signal exceeds a data threshold level, a first threshold level and a second threshold level, and may therefore provide basis for phase detection. According to the phase detection, the clock circuit may provide the first edge clock and the data clock, and the phase shifting circuit may provide the second edge clock by phase shifting.