Clock Delay Compensation Circuit for Precise Signal Synchronization
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Solution Overview
Problem
Existing clock synchronization and frequency translation technologies face challenges in reducing system clock errors, minimizing clock propagation delay variation, and achieving precise timing distribution and recovery, particularly in electronic systems where clock signals are critical for operation.
Innovation Solution
The integration of a system clock compensation circuit within integrated circuits (ICs) that generates compensation signals based on error models accounting for temperature, vibration, and supply voltage conditions, combined with digital phase-locked loops (DPLLs) for precise clock synchronization and frequency translation, enabling closed-loop and open-loop error compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If system clock signals are used to control timing of circuit blocks, then clock synchronization is achieved, but clock propagation delay variation and system clock errors increase under varying operating conditions
Solution Approach 1:
The patent applies preliminary action by measuring the actual propagation delay of the system clock signal through the circuit blocks before timing-critical operations occur. The delay measurement circuit quantizes the delay value in advance, and this pre-measured delay information is then used to compensate for timing errors in subsequent operations, thereby improving clock synchronization accuracy while accounting for manufacturing variations.
Solution Approach 2:
The patent implements feedback by continuously monitoring the propagation delay of the system clock signal through dedicated measurement circuits. The measured delay values are fed back to adjust timing compensation parameters, creating a closed-loop system that adapts to actual operating conditions. This feedback mechanism enables the system to compensate for both manufacturing variations and dynamic operating condition changes, resolving the contradiction between synchronization accuracy and delay consistency.
2Measurement precision
If traditional clock synchronization methods are used, then basic timing control is achieved, but precision timing distribution and recovery are insufficient
Solution Approach 1:
The patent replaces traditional mechanical/analog timing measurement methods with digital quantization techniques. The delay measurement circuit uses digital counters and logic circuits to precisely measure clock propagation delay, converting analog timing information into digital values that can be accurately processed and compensated. This substitution significantly improves measurement precision while reducing the time required for timing recovery compared to conventional analog methods.
Solution Approach 2:
The patent performs preliminary timing measurements and establishes compensation parameters before actual timing-critical operations. By pre-measuring propagation delays and pre-calculating compensation values, the system minimizes the time required for timing recovery during actual operations, thereby reducing timing loss while maintaining high precision.
3Stability of the object's composition
If phase-locked loops are used for clock synchronization, then frequency stability is improved, but update rate and phase offset detection are limited
Solution Approach 1:
The patent segments the clock synchronization function into multiple independent components: a phase-locked loop for frequency stability, a separate delay measurement circuit for precise timing, and a compensation circuit for error correction. This segmentation allows the PLL to operate at its natural stable frequency while the measurement and compensation circuits independently provide high-speed updates and precise phase offset detection, thereby resolving the contradiction between stability and update rate.
Solution Approach 2:
The patent introduces an intermediary delay measurement and compensation circuit that acts as a bridge between the PLL and the actual timing-critical circuit blocks. This intermediary layer continuously measures propagation delays and provides real-time compensation, enabling the system to achieve both PLL frequency stability and high update rates for timing accuracy without direct conflict between the two functions.
Data Source
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.