Adaptive Delay-Locked Clock 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 traditional feedback phase-locking scheme is used to synchronize clock signals, then the phase-locking stability is improved, but the initialization time increases significantly
Solution Approach 1:
The patent applies preliminary action by measuring the phase difference between clock signals before initiating the feedback phase-locking process. This initial measurement allows the system to pre-calculate the required delay adjustment, enabling faster convergence to phase-lock without sacrificing stability. The phase detection circuit captures the initial phase offset, and this information is used to set an initial delay value that brings the system closer to the locked state immediately.
Solution Approach 2:
The patent utilizes feedback by continuously monitoring the phase difference between the input and output clock signals and dynamically adjusting the delay element accordingly. The phase detector provides real-time feedback about the phase error, and this feedback drives the delay element to reduce the error iteratively. This closed-loop feedback mechanism ensures stable phase-locking while the initial phase measurement accelerates the convergence process.
2Measurement precision
If a large number of feedback cycles are performed to achieve phase-lock, then the synchronization accuracy is improved, but the productivity of the memory device decreases
Solution Approach 1:
The patent performs preliminary phase difference measurement and initial delay configuration before the memory device begins normal operation. This preliminary action ensures that the phase-locking process starts from an optimized initial state, reducing the number of feedback cycles needed to achieve accurate synchronization. Consequently, the memory device can reach full productivity faster without compromising synchronization precision.
Solution Approach 2:
The patent implements dynamic delay adjustment where the delay element can be rapidly modified based on real-time phase error feedback. This dynamic capability allows the system to quickly adapt and converge to the correct phase relationship, achieving both high synchronization accuracy and fast initialization. The delay element's ability to change dynamically enables the system to balance between convergence speed and locking precision.
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.