Phase Control Block for Multi-Clock Recovery With Variable Phase Offset
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Solution Overview
Problem
Modern digital systems require precise synchronization of multiple clock domains to handle high-speed data transmission, but existing technologies struggle to manage variable phase offsets and synchronize three or more clock domains effectively.
Innovation Solution
A second-order clock recovery circuit with feedback mechanisms, including phase detectors and accumulators, allows for selectively variable phase offsets between clock domains, using phase adjustment signals to synchronize edge and data clocks with the transmitter clock, enabling precise synchronization of multiple clock domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple clock domains are used to sample digital signals at high speed, then data transmission speed is improved, but synchronization precision between clock domains deteriorates
Solution Approach 1:
The patent divides the clock synchronization system into multiple independent clock domains (edge clock domain and data clock domain), each with its own phase detector and control mechanism. This segmentation allows each clock domain to be optimized independently for its specific sampling function while maintaining overall system synchronization through separate feedback loops.
Solution Approach 2:
The patent dynamically adjusts phase offset parameters between clock domains using phase detectors that measure timing differences and control circuits that modify clock phase parameters in real-time. This enables the system to adapt synchronization parameters to maintain precision despite high-speed operation challenges.
2Adaptability or versatility
If variable phase offsets are implemented between clock domains, then adaptability to different signal conditions is improved, but device complexity increases
Solution Approach 1:
The patent implements feedback loops where phase detectors continuously monitor the phase relationship between clock domains and feed this information back to phase offset control circuits. This automatic feedback mechanism provides adaptability to varying signal conditions without requiring complex manual adjustment mechanisms, as the system self-regulates the phase offsets based on real-time measurements.
Solution Approach 2:
The phase detection and adjustment circuits are integrated within the receiver itself, allowing the system to automatically detect and correct synchronization issues without external intervention. The receiver performs its own phase measurement and adjustment, eliminating the need for separate complex synchronization equipment.
3Manufacturing precision
If three or more clock domains are synchronized, then sampling accuracy is improved, but the difficulty of detecting and measuring phase errors increases
Solution Approach 1:
The patent introduces phase detectors as intermediary components that simplify the measurement of phase relationships between multiple clock domains. These detectors convert complex multi-domain phase relationships into manageable error signals that can be easily processed by control circuits, making it straightforward to synchronize three or more clock domains without directly measuring all possible phase combinations.
Data Source
AI summary
A circuit for performing clock recovery according to a received digital signal 30. The circuit includes at least an edge sampler 105 and a data sampler 145 for sampling the digital signal, and a clock signal supply circuit. The clock signal supply circuit provides edge clock 25 and data clock 20 signals offset in phase from one another to the respective clock inputs of the edge sampler 105 and the data sampler 145. The clock signal supply circuit is operable to selectively vary a phase offset between the edge and data clock signals.