Time-Interleaved Receiver Phase Recovery for Pulse Width Distortion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional clock and data recovery systems fail to accurately maintain phase alignment of multiple parallel signal paths in high-speed communication systems, especially when faced with transmitter impairments like pulse width distortion and inter-symbol interference, leading to data sampling errors.
Innovation Solution
A clock and data recovery circuit with a phase detector that calculates a sum of gradients for multiple data interleaves and an accumulated differential gradient for each interleave, controlling a multiphase clock generator and configurable delay elements to adjust sampling phases and compensate for phase misalignments and transmitter impairments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional clock and data recovery systems are used, then the system structure is simple, but phase alignment accuracy deteriorates in the presence of transmitter pulse width distortion and inter-symbol interference
Solution Approach 1:
The patent divides the clock and data recovery system into multiple parallel signal paths (interleaves), where each interleave processes a portion of the data stream independently. This segmentation allows the system to maintain phase alignment accuracy across multiple channels while managing complexity through modular architecture. Each interleave has its own phase detection and adjustment mechanisms, enabling independent optimization without affecting other channels.
Solution Approach 2:
The patent implements dynamic phase adjustment mechanisms that continuously adapt to transmitter impairments such as pulse width distortion and inter-symbol interference. The system uses real-time gradient calculations and feedback loops to dynamically modify sampling phases, allowing the receiver to track and compensate for time-varying channel conditions. This dynamic adaptation maintains measurement precision without requiring a static, overly complex predetermined structure.
2Productivity
If multiple parallel signal paths (interleaves) are used to increase throughput, then productivity improves, but maintaining phase alignment across interleaves becomes more difficult
Solution Approach 1:
The patent employs feedback mechanisms where the phase detector monitors sampling errors in each interleave and generates gradient information that feeds back to adjust the timing recovery parameters. This closed-loop feedback ensures that phase alignment is continuously maintained across all interleaves despite variations in data throughput requirements. The feedback signal enables automatic correction of phase drift, maintaining reliability while supporting high productivity through parallel processing.
Solution Approach 2:
The patent designs a universal phase alignment mechanism that serves all interleaves simultaneously. The timing recovery circuitry is configured to handle multiple data streams with a unified phase detection and adjustment approach, allowing the system to maintain consistent phase alignment across diverse parallel signal paths. This multi-functional design enables the same hardware structure to support varying throughput requirements while preserving synchronization integrity.
3Measurement precision
If adaptive compensation for transmitter impairments is implemented, then data recovery accuracy improves, but the complexity of the recovery circuit increases
Solution Approach 1:
The patent adjusts timing parameters such as sampling phase and clock frequency dynamically to compensate for transmitter impairments like pulse width distortion and inter-symbol interference. By changing these operational parameters based on detected error gradients, the system improves data sampling accuracy without fundamentally altering the core recovery circuit architecture. This parameter-based adaptation achieves high precision while controlling circuit complexity through software-controlled adjustments rather than hardware redesign.
Data Source
AI summary
This disclosure relates to a receiver that includes a clock and data recovery loop and a phase offset loop. The clock and data recovery loop may be controlled by a sum of gradients for a plurality of data interleaves. The phase offset loop may be controlled by an accumulated differential gradient for each of the data interleaves.