Clock Recovery Phase Control for Multiple Frequency-Offset Domains
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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 with a transmitter clock.
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 across multiple clock domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple clock domains are used to sample the digital signal at different points, then the reliability of data sampling is improved, but the complexity of synchronizing these clock domains increases
Solution Approach 1:
The patent employs phase detectors that continuously monitor the phase relationship between multiple clock domains and generate phase error signals. These feedback signals are used by phase controllers to dynamically adjust clock phases, ensuring synchronized operation across edge and data clock domains while maintaining sampling reliability.
Solution Approach 2:
The patent introduces phase controllers as intermediary components between the phase detectors and the clock generation circuits. These controllers act as mediators that receive phase error information and translate it into appropriate phase adjustment commands, simplifying the overall synchronization architecture.
2Speed
If the data intervals are made as short as possible to achieve high-speed transmission, then the transmission speed is improved, but the precision requirement for clock synchronization increases
Solution Approach 1:
The patent implements dynamic phase adjustment mechanisms where clock phases are continuously adapted based on real-time phase error measurements. This allows the system to maintain precise synchronization even at extremely short data intervals by actively compensating for timing variations rather than relying on fixed, ultra-precise initial synchronization.
Solution Approach 2:
The patent changes the phase parameter of clock signals dynamically through phase controllers that adjust clock phases based on phase error signals. This enables the system to adapt synchronization precision on-the-fly, maintaining accurate timing relationships despite high-speed transmission constraints.
3Measurement precision
If phase detectors and phase controllers are added to synchronize clock domains, then the synchronization precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines phase detection and phase control functions into an integrated feedback system where phase detectors and phase controllers work as a unified mechanism. This merging approach reduces overall system complexity compared to having separate, independent synchronization subsystems.
Solution Approach 2:
The phase detectors and phase controllers are designed to handle multiple clock domains simultaneously, providing universal synchronization capability across different clock frequencies and phases. This multi-functionality reduces the need for dedicated synchronization circuits for each clock pair.
Data Source
AI summary
A circuit for performing clock recovery according to a received digital signal. The circuit includes at least an edge sampler and a data sampler for sampling the digital signal, and a clock signal supply circuit. The clock signal supply circuit provides edge clock and data clock signals offset in phase from one another to the respective clock inputs of the edge sampler and the data sampler. A digital phase detector determines if the data clock is early, late or synchronized with respect to data value transitions in the digital signal, and based on that determination provides a phase adjustment signal to the clock signal supply circuit, which is operable to vary phases of the data and edge clock signals accordingly.