Receiver Sampling Phase Tuning Under Delay Mismatch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuit devices face challenges in sampling position tuning due to asymmetric data eyes and mismatched delays, leading to sub-optimal sampling phases that affect signal-to-noise ratio and data recovery.
Innovation Solution
A method and apparatus for sampling position tuning, where a receiver temporarily suspends its operation to adapt to a communications channel, iteratively adjusts the phase interpolator's sampling phase by determining error slicer outputs at different candidate phases to identify and converge on an optimum sampling point, ensuring accurate data sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed sampling phase is used in the phase interpolator, then the receiver structure is simple, but the sampling position is sub-optimal due to asymmetric data eyes and layout mismatches
Solution Approach 1:
The patent implements dynamic sampling phase adjustment by introducing a detector that iteratively determines optimal phase interpolator codes based on error slicer outputs. The system transitions from a static fixed sampling phase to a dynamic adaptive sampling phase that can be tuned during initialization or operation to achieve optimal sampling positions despite asymmetric data eyes and layout mismatches.
Solution Approach 2:
The patent changes the sampling phase parameter by iteratively adjusting the phase interpolator code based on detected error metrics. The detector modifies the phase interpolator code to move the sampling phase toward the optimal position, thereby improving sampling accuracy without requiring a complete redesign of the receiver structure.
2Ease of operation
If sampling is performed at a fixed phase interpolator code location, then the operation is straightforward, but the signal-to-noise ratio is degraded due to asymmetric eyes and mismatched delays
Solution Approach 1:
The patent implements a feedback mechanism where the error slicer output is fed back to the detector, which then adjusts the phase interpolator code accordingly. This closed-loop feedback system allows the receiver to automatically compensate for asymmetric eyes and mismatched delays, improving signal-to-noise ratio while maintaining ease of operation through automated tuning.
Solution Approach 2:
The receiver performs self-tuning of the sampling phase through the detector and error slicer mechanism. The system automatically identifies and corrects sub-optimal sampling positions without requiring external intervention or complex manual calibration, thereby improving reliability while keeping the operation straightforward.
3Productivity
If the receiver operates continuously without suspension, then the productivity is high, but the sampling phase cannot be optimized for the specific communications channel
Solution Approach 1:
The patent performs preliminary sampling phase optimization during receiver initialization or idle periods before normal data transmission begins. The detector iteratively adjusts the phase interpolator code to achieve optimal sampling position in advance, allowing the receiver to then operate at full productivity without continuous suspension while maintaining adaptability to the specific communications channel.
Data Source
AI summary
An apparatus generally relating to a receiver is disclosed. In this apparatus, the receiver includes a phase interpolator, a detector and a slicer. The slicer is coupled to the phase interpolator to provide a sampling signal for a sampling position of the phase interpolator. The detector is coupled to the slicer to receive the sampling signal. The detector is configured to adjust a code of the phase interpolator to adjust the sampling position iteratively in response to the sampling signal to tune the sampling position of the receiver toward an optimum therefor.