Multilane SerDes CDR Architecture for Jitter-Resilient Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing Serializer/Deserializer (SerDes) systems face challenges in maintaining accurate data transmission over multiple interleaved lanes due to jitter and frequency drift, leading to errors in symbol detection, especially when the serial data rate is high, and current solutions are costly and inefficient for multi-lane systems.
Innovation Solution
A non-recursive architecture for the Clock and Data Recovery (CDR) circuit is implemented, using an early-late algorithm and Time Error Detection (TED) to optimize clock synchronization across multiple lanes, reducing hardware requirements and costs by reconfiguring existing components to preserve state values throughout the interleaving cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional CDR circuits are used for each lane in multilane SerDes systems, then symbol detection accuracy can be maintained, but hardware complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple lane error signals into a single integrated error signal that controls a shared clock recovery mechanism. Instead of implementing separate CDR circuits for each lane, the invention merges the error detection and clock adjustment functions across all lanes, reducing hardware complexity while maintaining detection accuracy through centralized control.
Solution Approach 2:
The patent creates a universal clock recovery circuit that serves all lanes simultaneously. The single CDR circuit performs the function of multiple separate circuits by processing error signals from all lanes and generating a unified clock adjustment that benefits every lane, making the system more efficient and less complex.
2Reliability
If separate CDR circuits are implemented for each lane, then clock synchronization can be maintained, but the number of hardware components and cost increase
Solution Approach 1:
The patent merges the clock recovery functionality across multiple lanes by combining error signals and using a single controlled oscillator. This approach maintains clock synchronization for all lanes while using far fewer hardware components than would be required for separate CDR circuits in each lane.
Solution Approach 2:
The patent uses a single error signal processing architecture that is effectively copied or replicated across lanes through the interleaved processing approach, rather than physically duplicating entire CDR circuits. This allows synchronization maintenance with reduced hardware duplication.
3Productivity
If high serial data rate is used to increase transmission speed, then productivity improves, but jitter and frequency drift increase causing detection errors
Solution Approach 1:
The patent implements a feedback mechanism where error signals from received symbols are continuously processed and used to adjust the clock phase and frequency. This closed-loop control compensates for jitter and frequency drift that increase at high data rates, maintaining detection accuracy despite the challenges of high-speed transmission.
Solution Approach 2:
The patent uses a dynamic clock adjustment mechanism that continuously adapts the clock signal based on real-time error feedback. The clock phase and frequency are dynamically adjusted to track and compensate for variations caused by high-speed transmission effects such as jitter and drift, enabling accurate detection at high data rates.
Data Source
AI summary
A method for implementing an efficient clock recovery for multilane high-speed Serializer/Deserializer (SerDes) system having M interleaved lanes, has a non-recursive architecture.