Single Clock CDR for Low Power High Speed Data Recovery
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Solution Overview
Problem
Traditional clock and data recovery (CDR) systems in high-speed communication systems consume significant power and space due to the use of multiple system clocks, which are challenging to synchronize accurately amidst noise and distortions, especially in Gigahertz communication systems where precise timing is crucial.
Innovation Solution
A single low-power clock system that utilizes time-amplitude sampling and feedback loops to adjust the sampling clock based on predetermined bit patterns, allowing for improved data recovery by determining whether the waveform is leading or lagging the center of the eye pattern, thereby optimizing the sampling time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multiple system clocks are used in CDR systems, then data sampling capability is provided, but power consumption increases and circuit complexity increases
Solution Approach 1:
The patent merges the functions of multiple system clocks into a single clock system. The single clock signal is distributed to multiple sampling circuits, eliminating the need for separate clock generators for each sampling operation. This consolidation directly reduces power consumption while maintaining the data sampling capability through shared clock resources.
Solution Approach 2:
The single clock system serves multiple functions simultaneously - it provides timing signals for multiple sampling circuits, enables both data sampling and eye pattern detection, and supports various sampling operations. This multi-functionality allows the system to maintain full CDR capabilities with reduced power consumption compared to dedicated clocks for each function.
2Reliability
If traditional multiple system clocks are used in CDR systems, then data sampling capability is provided, but device complexity increases
Solution Approach 1:
The patent combines multiple clock generation circuits into a single clock source that serves all sampling operations. This merging reduces the number of clock generators, phase-locked loops, and associated control circuitry, directly simplifying the overall device architecture while preserving data sampling functionality.
Solution Approach 2:
The system dynamically allocates the single clock signal to different sampling circuits as needed, rather than requiring static dedicated clocks for each function. This dynamic sharing approach reduces circuit complexity while maintaining the flexibility and capability of multiple sampling operations.
3Measurement precision
If sampling is performed at center of eye pattern, then data recovery accuracy is improved, but timing synchronization difficulty increases due to waveform variations
Solution Approach 1:
The patent implements feedback mechanisms that monitor the actual waveform characteristics and adjust sampling timing accordingly. By continuously detecting eye pattern variations and feeding this information back to the sampling circuit, the system maintains accurate timing synchronization despite waveform variations, ensuring data recovery accuracy without manual intervention.
Solution Approach 2:
The system performs preliminary detection and characterization of the eye pattern before actual data sampling. By pre-analyzing waveform variations and determining optimal sampling points in advance, the system prepares the timing synchronization parameters ahead of time, making the actual sampling process more accurate and reducing the difficulty of real-time timing adjustment.
Data Source
AI summary
A sampling clock signal controller for receivers of digital data is disclosed. Specific bit patterns of a data waveform can be identified, and stored time samples of the waveform that correspond to the specific bit patterns can be analyzed to improve the timing of a sampling clock signal. These “time-amplitude” samples on known bit patterns can be utilized to determine if a sample on the data waveform should be taken before the center of the eye pattern, at the center of the eye pattern, or after the center of the eye pattern and by what time change. Accordingly, a single low power clock can be utilized to adjust the timing of the sample clock such that improved communication scan be achieved. Such a single clock system has reduced power requirements and increased accuracy.