Clock Synchronization IC for Jitter Cleanup and Delay Compensation
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Solution Overview
Problem
Current electronic systems face challenges in accurately synchronizing and translating clock signals across distributed systems, particularly in ensuring frequency stability and accuracy amidst environmental variations and signal propagation delays, which affects the reliability and precision of timing in applications like GPS, PTP, and Stratum 2, 3e systems.
Innovation Solution
A distributed timing system incorporating a clock synchronization and frequency translation integrated circuit (IC) with features like digital and analog phase-locked loops, numerically controlled oscillators, and system clock compensation circuits, which processes input reference signals with embedded subcarrier frequencies to provide jitter cleanup, phase offset control, and delay compensation, ensuring stable clock signals across varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock signals are transmitted across distributed systems, then timing synchronization is achieved, but frequency stability and accuracy deteriorate due to environmental variations and signal propagation delays
Solution Approach 1:
The patent introduces an intermediary clock signal processing system that includes phase-locked loops and frequency synthesizers. These intermediaries receive the transmitted clock signals and regenerate them with improved stability and accuracy, effectively mediating between the transmitted signal and the final synchronized output to compensate for environmental variations and propagation delays
Solution Approach 2:
The patent implements feedback mechanisms through phase-locked loops where the output clock signal is continuously compared with the reference signal, and the phase/d frequency errors are fed back to adjust the voltage-controlled oscillators. This closed-loop feedback system automatically compensates for frequency drift and stability degradation caused by environmental factors
2Measurement precision
If environmental compensation is implemented, then frequency stability is improved, but device complexity increases
Solution Approach 1:
The patent employs parameter changes by using voltage-controlled oscillators whose frequency and phase parameters are dynamically adjusted based on feedback error signals. Temperature compensation circuits modify circuit parameters to counteract environmental effects, achieving frequency stability through controlled parameter variation rather than complex structural changes
Solution Approach 2:
The clock synchronization device performs multiple functions including frequency synthesis, phase locking, frequency translation, and environmental compensation within a single integrated system. This multi-functionality reduces overall system complexity by consolidating what would otherwise require separate dedicated circuits for each function
3Measurement precision
If phase offset control is implemented, then timing precision is improved, but system complexity increases
Solution Approach 1:
The patent replaces mechanical or manual phase adjustment mechanisms with electronic phase-locked loop control systems. The phase offset is automatically controlled through electronic feedback and voltage-controlled phase shifters, eliminating the need for complex mechanical adjustment devices while achieving precise timing control
Data Source
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AI summary
Apparatus and methods for clock synchronization and frequency translation are provided herein. Clock synchronization and frequency translation integrated circuits (ICs) generate one or more output clock signals having a controlled timing relationship with respect to one or more reference signals. The teachings herein provide a number of improvements to clock synchronization and frequency translation ICs, including, but not limited to, reduction of system clock error, reduced variation in clock propagation delay, lower latency monitoring of reference signals, precision timing distribution and recovery, extrapolation of timing events for enhanced phase-locked loop (PLL) update rate, fast PLL locking, improved reference signal phase shift detection, enhanced phase offset detection between reference signals, and/or alignment to phase information lost in decimation.