Timing Synchronization Control for Multi-Path Clock Distribution
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Solution Overview
Problem
Accurate timing synchronization between components in electronic systems, such as phased antenna arrays, is challenging due to varying distances and environmental factors like aging, radiation, and electromagnetic interference, which can introduce errors over time.
Innovation Solution
A system that distributes a master clock signal, frame-sync signal, and master-frame-reset signal, with the timing controller adjusting signal propagation delays to compensate for differences in each host device's path, using either closed-loop or open-loop techniques to maintain synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the master clock signal is distributed to host devices at different distances, then the system can cover a larger area and accommodate more devices, but the signal propagation delay varies causing synchronization errors
Solution Approach 1:
The system performs preliminary timing measurements during a calibration phase before normal operation. The timing controller measures the propagation delay from itself to each network interface module and calculates the required delay adjustment in advance. This preliminary action allows the system to compensate for distance variations without affecting real-time synchronization accuracy.
Solution Approach 2:
The system implements a feedback mechanism where timing information is measured and used to adjust delay settings. The timing controller receives timing signals from network interface modules, measures propagation delays, and automatically adjusts the delay applied to each module's output signals to maintain synchronization. This closed-loop feedback ensures accurate timing despite varying distances.
2Measurement precision
If the system compensates for propagation delay using fixed values determined at installation, then the initial synchronization accuracy is high, but synchronization errors accumulate over time due to environmental changes
Solution Approach 1:
The system transitions from static delay compensation to dynamic adjustment. The delay values are no longer fixed but are continuously or periodically updated based on real-time measurements of propagation delay. This dynamic approach allows the system to adapt to environmental changes such as temperature variations, component aging, and radiation effects, maintaining synchronization accuracy over long periods.
Solution Approach 2:
The system continuously monitors timing signals and measures actual propagation delays, then feeds this information back to adjust delay settings. This feedback loop detects drift caused by environmental factors and automatically corrects it, ensuring long-term reliability without requiring manual recalibration.
3Measurement precision
If the system implements a closed-loop timing measurement and adjustment mechanism, then synchronization accuracy is maximized, but the system complexity and resource requirements increase
Solution Approach 1:
The system introduces a dedicated timing controller as an intermediary component that centralizes the timing measurement and adjustment functions. This timing controller acts as a mediator between the master clock source and the network interface modules, handling all delay measurements and adjustments in one location. This approach simplifies the overall system architecture compared to implementing distributed timing control in each module.
Solution Approach 2:
The timing controller performs multiple functions: it distributes timing signals to network interface modules, measures propagation delays, calculates required delay adjustments, and applies the corrective delays. By consolidating these diverse functions into a single multi-functional component, the system achieves high synchronization accuracy without proportionally increasing overall system complexity.
Data Source
AI summary
Embodiments of a method and system for both open-loop and closed-loop timing synchronization are provided in which a master clock signal, and a plurality of signals that define greater periods of time, are distributed to a plurality of host devices. A frame-sync signal is used to define a “frame” consisting of a predetermined number of clock periods, and a reset signal is used to define a larger period consisting of a predetermined number of frames. Due to a variety of system parameters, the innate delay time associated with each respective timing distribution path may differ. The system is operable to adjust the timing signals propagated to the plurality of host devices along each respective timing distribution path to compensate for these differences so that each host device remains synchronized with all other host devices.