Phase Detector Synchronization of Divider Clocks in TI Arrays
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Solution Overview
Problem
Existing data communication systems face challenges in efficiently synchronizing multiple time-interleaving sub-systems due to nonlinearities, gain/offset mismatches, and timing errors, leading to increased chip area, production cost, and power consumption.
Innovation Solution
A method and device for synchronizing large-scale time-interleaving systems using a phase detector that compares divider output clocks across multiple TI devices, employing techniques like XOR/XNOR gate phase detection and Time-to-Digital Converter (TDC) for alignment, and statistical correlation using autocorrelation of TI device outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional synchronization methods are used for multi-instance TI systems, then timing alignment can be achieved, but chip area, production cost, and power consumption increase
Solution Approach 1:
The synchronization function is segmented and distributed to individual TI devices, where each device independently determines phase differences using its own divider output clocks. This eliminates the need for a centralized synchronization circuit, thereby reducing overall chip area while maintaining timing alignment across all TI instances.
Solution Approach 2:
Each TI device performs self-synchronization by using its own divider output clocks to determine phase differences with other devices. This self-service approach eliminates the need for external or centralized synchronization control circuits, reducing chip area, power consumption, and production cost while achieving reliable timing alignment.
2Reliability
If conventional synchronization methods are used for multi-instance TI systems, then timing alignment can be achieved, but production cost increases
Solution Approach 1:
Each TI device independently performs phase difference determination using its own divider output clocks, eliminating the need for complex centralized synchronization control circuits. This simplification reduces manufacturing complexity and production cost while maintaining reliable timing alignment across all TI instances.
3Reliability
If conventional synchronization methods are used for multi-instance TI systems, then timing alignment can be achieved, but power consumption increases
Solution Approach 1:
Each TI device independently determines phase differences using its own divider output clocks without requiring continuous operation of centralized synchronization circuits. This self-service approach reduces the overall power consumption of the system while maintaining reliable timing alignment, as each device only consumes power when performing phase determination.
4Measurement precision
If phase detector compares all divider output clocks simultaneously, then synchronization accuracy improves, but device complexity increases
Solution Approach 1:
The phase comparison process is segmented into hierarchical levels, where the phase detector compares divider output clocks level by level from highest to lowest. This segmentation maintains synchronization accuracy by systematically comparing all necessary clocks while reducing device complexity through organized, staged comparison rather than simultaneous comparison of all clocks.
Solution Approach 2:
The phase detector performs preliminary comparisons at higher divider levels before proceeding to lower levels. This preliminary action organizes the synchronization process hierarchically, maintaining accuracy by establishing phase relationships at each level before moving to the next, while reducing complexity through structured progression rather than chaotic simultaneous comparison.
Data Source
AI summary
A multi-instance time-interleaving (TI) system and method of operation therefor. The system includes a plurality of TI devices, each with a plurality of clock generation units (CGUs) coupled to an interleaver network. Within each TI device, the plurality of CGUs provides a plurality of clock signals needed by the interleaver network. A phase detector device is coupled to the plurality of TI devices and configured to determine any phase differences between the clock signals of a designated reference TI device and the corresponding clock signals of each other TI device. To determine the phase differences, the phase detector can use a logic comparator configuration, a time-to-digital converter (TDC) configuration, or an auto-correlation configuration. The phases of the clock signals of each other TI device can be aligned to the reference TI device using internal phase control, retimers, delay cells, finite state machines, or the like.