Adaptive Delay-Locked Loop Initialization for Faster Memory Sync
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Solution Overview
Problem
Existing clock synchronization methods, such as delay-locked loops, require a large number of feedback cycles to achieve phase-lock, leading to prolonged initialization times in electronic devices, which is undesirable, especially in memory devices where speed and efficiency are critical.
Innovation Solution
An adaptive clock synchronization system that uses a feedback component and an adaptive adjustment component to dynamically determine phase shifts, allowing for iterative adjustments based on the phase difference between input and output clock signals, thereby reducing the number of cycles required for synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback scheme is used to synchronize clock signals, then phase-lock is achieved, but the number of feedback cycles increases, leading to longer initialization time
Solution Approach 1:
The patent measures the initial phase difference between clock signals before entering the feedback loop, and applies a preliminary phase adjustment based on this measurement. This preliminary action reduces the initial phase offset, allowing the feedback loop to converge much faster and achieving phase-lock in fewer cycles, thereby resolving the contradiction between reliable phase-lock achievement and reduced initialization time
Solution Approach 2:
The patent dynamically adjusts the phase shift parameter based on the measured phase difference. By changing the phase adjustment parameter adaptively rather than using a fixed incremental adjustment, the system can rapidly close the phase gap and achieve synchronization faster, thus reducing initialization time while maintaining reliable phase-lock
Data Source
AI summary
Systems and methods for synchronization of clock signals are disclosed. In a feedback system such as a delay-lock loop circuit, delays to be applied can be determined adaptively based on a phase difference between a reference signal and a clock signal being delayed. Such adaptive decisions can be made during each feedback cycle, thereby making it possible to achieve a phase lock faster and more efficiently. In some embodiments, such adaptive functionality can be incorporated into existing circuits with minimal impact.