Multi-Chip Clock Synchronization With Picosecond Skew Correction

The patent implements an active feedback-based synchronization system where a master sensor chip measures timing skew relative to slave chips and communicates correction values back to them. Each chip includes a time-digitizing unit that converts timing skew into digital correction values, which are then applied to adjust local clock phases. This closed-loop feedback mechanism continuously compensates for manufacturing variations and environmental drift, achieving picosecond-level synchronization accuracy without requiring extremely precise passive matching of transmission lines.

The patent segments the synchronization problem into chip-level autonomous operations. Each sensor chip operates independently with its own local clock and time-digitizing unit, measuring timing skew relative to the master chip and applying corrections locally. This segmentation allows arbitrary scaling of the sensor array without requiring redesign of the clock distribution network. The master-slave architecture with independent correction application to each chip enables reliable synchronization across large numbers of chips, as each chip self-corrects rather than relying on cumulative passive matching.

The patent implements self-calibration at the chip level. Each sensor chip autonomously measures its own timing skew relative to the master using its local time-digitizing unit and automatically applies correction values to its clock phase. This self-service approach eliminates the need for external extensive calibration procedures or manual adjustment mechanisms. The system performs its own calibration continuously during operation, achieving picosecond accuracy through automated feedback rather than labor-intensive manual calibration processes.