Memory Delay-Lock Loop Calibration for Faster Phase Lock
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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 crucial.
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 needed for synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional feedback-based clock synchronization is used, then phase-lock is achieved, but initialization time becomes excessively long
Solution Approach 1:
The patent performs preliminary phase measurement during a calibration period before normal operation. By measuring the initial phase difference between clock signals in advance and storing this information, the system eliminates the need for lengthy feedback cycles during initialization, achieving both reliable phase-lock and fast initialization
Solution Approach 2:
The system pre-determines the appropriate delay amount based on measured phase differences during calibration. This preliminary calculation of required delay allows the system to jump directly to the correct synchronization state without iterative feedback adjustments, dramatically reducing initialization time
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.