Digitally Calibrated Clock Distribution for Phase Drift Correction
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Solution Overview
Problem
Conventional clock distribution circuits are susceptible to degradation due to aging, temperature, and mechanical stress, requiring periodic and manual re-calibration, and are not integrated, which limits their ability to dynamically adjust for phase delays in large-scale electronic systems like antenna arrays without degrading the phase noise of the clock signal.
Innovation Solution
A digitally calibrated clock distribution circuit with phase adjustment circuits, phase detectors, loop filters, and current sources that use DC voltage feedback signals to dynamically adjust the phase shift of clock signals, allowing for sub-picosecond synchronization across thousands of nodes, integrating multiple timing adjustments on a single IC and self-correcting for variations due to aging, temperature, and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional manual calibration processes are used to adjust delay elements, then initial calibration may be achieved, but the system is susceptible to temperature, mechanical stress, and aging that cause loss of calibration and require periodic re-calibration
Solution Approach 1:
The patent implements a feedback mechanism where phase error detection circuits continuously monitor the phase alignment between clock signals and delay elements. The system automatically adjusts delay elements based on detected phase errors, creating a closed-loop control system that maintains calibration stability despite temperature, mechanical stress, and aging effects.
Solution Approach 2:
The calibration system performs self-adjustment through automatic phase error detection and correction. The delay elements are automatically tuned based on real-time phase measurements without requiring external manual intervention, enabling the system to self-correct calibration drift caused by environmental factors.
2Manufacturing precision
If a large number of timing adjustments are integrated on the same IC, then skew reduction is achieved, but the circuit complexity increases
Solution Approach 1:
The patent divides the clock distribution system into multiple independent delay elements, each with its own phase error detection and adjustment capability. This segmentation allows each element to be independently calibrated, reducing overall skew while maintaining manageable complexity through modular design.
Solution Approach 2:
The patent employs universal delay elements that can be programmed to provide different delay values based on calibration requirements. These multi-functional elements serve both as clock distribution components and as adjustable timing correction devices, reducing the need for separate calibration circuits.
3Reliability
If dynamic adjustment for clock signal drift is implemented without periodic re-calibration, then continuous phase alignment is achieved, but the system requires complex calibration processes that may degrade phase noise
Solution Approach 1:
The patent replaces manual mechanical calibration processes with electronic phase error detection and automatic adjustment mechanisms. Digital control circuits substitute for manual delay element adjustment, enabling dynamic compensation of clock drift without physical intervention or complex manual procedures that could introduce noise.
Data Source
AI summary
An electronic circuit for distributing a clock signal to several clock destinations includes phase adjustment circuits for adjusting phase shifts of the clock at the respective one of the clock destinations responsive to a respective DC voltage feedback signal receive from the respective one of the clock destinations; phase detectors for detecting a phase shift of the clock signal at the respective one of the clock destinations according to a nearest neighbor clock destination; loop filters for generating and transmitting respective DC voltage feedback signals; current sources, each configured to receive the respective DC voltage feedback signal and output a respective current to a respective one of the phase adjustment circuits according to said respective DC voltage feedback signals to adjust the phase shift of the clock signal for the respective one of the clock destinations.