Quadrature Clock Error Correction in Memory Interfaces
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Solution Overview
Problem
Existing memory devices face challenges in accurately correcting phase errors in quadrature clocks due to variations in Process, Voltage, Temperature (PVT), leading to inefficiencies and errors in data transmission and storage, which are not effectively addressed by conventional sequential phase error correction methods.
Innovation Solution
A non-sequential quadrature error correction method is implemented using a single phase detector and delay lines, allowing for parallel updates of delay codes across quadrature clocks, reducing lock time and minimizing resource consumption while maintaining accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional sequential phase error correction methods are used, then the correction process is simple to implement, but the lock time is long and data transmission speed is reduced
Solution Approach 1:
The phase error correction process is segmented into multiple parallel correction paths, each handling different phase relationships simultaneously. This allows the system to correct multiple phase errors concurrently rather than sequentially, significantly reducing lock time while maintaining implementation simplicity
Solution Approach 2:
The system performs preliminary phase error detection and correction setup before full data transmission begins. By pre-adjusting delay codes and establishing correct phase relationships in advance, the lock time is reduced without compromising transmission speed
2Loss of time
If multiple phase detectors are used to correct phase errors in parallel, then lock time is reduced, but resource consumption and chip size increase
Solution Approach 1:
A single phase detector is designed to perform multiple correction functions by sequentially detecting different phase relationships and controlling different delay lines. This multi-functional approach achieves parallel correction效果 without requiring multiple physical detectors, reducing resource consumption while maintaining fast lock time
Solution Approach 2:
The system dynamically reconfigures the phase detector's measurement targets and delay line control assignments during the correction process. By dynamically switching between different phase comparison pairs and delay code updates, the system achieves efficient parallel correction with minimal hardware resources
3Reliability
If sequential phase error correction is performed, then resource consumption is minimized, but correction accuracy deteriorates due to PVT variations
Solution Approach 1:
The system implements continuous feedback loops where phase error detection results are immediately used to adjust delay codes, which in turn refine phase alignment. This iterative feedback mechanism ensures high correction accuracy by continuously compensating for PVT variations without requiring excessive hardware resources
Solution Approach 2:
The system replaces complex hardware-based parallel correction mechanisms with a more efficient digital control approach. By using digital delay code adjustments and logical control signals instead of multiple physical correction paths, the system achieves high accuracy while minimizing resource consumption
Data Source
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AI summary
A method of operating a memory device includes receiving a quadrature clock and performing quadrature error correction of the quadrature clock in a non-sequential scheme, wherein the quadrature clock includes a first clock, a second clock, a third clock, and a fourth clock, having a sequential phase.