Phase Relation Estimation for Double-Data-Rate Binary Signals
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Solution Overview
Problem
As bit rates and data transfer rates increase, accurately estimating the phase relation between binary signals, such as clock and data signals in double-data-rate systems, becomes increasingly challenging due to higher clock frequencies, necessitating a precise method for phase detection.
Innovation Solution
A method and apparatus that determine edge times of binary signals and calculate a quotient based on these times to classify signals as in-phase or out-of-phase, using a modulo 2 operation to differentiate between even and uneven values, allowing for phase relation estimation between clock and data signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If clock frequency is increased to achieve higher data transfer rates, then productivity is improved, but measurement precision deteriorates due to challenging phase estimation at high frequencies
Solution Approach 1:
The phase detection process is segmented into multiple discrete steps: detecting rising and falling edges of the clock signal, detecting edges of the data signal, calculating time differences between corresponding edges, and determining phase relationship. This segmentation allows precise measurement at each stage even at high frequencies
Solution Approach 2:
The method performs preliminary edge detection and time stamping of signal transitions before calculating phase relationships. By capturing edge times preliminarily, the system can accurately compute phase differences even when operating at elevated clock frequencies where traditional continuous measurement becomes challenging
2Device complexity
If traditional phase detection methods are used at high clock frequencies, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces traditional analog phase detection mechanisms with a digital method based on edge time detection and computational analysis. By substituting mechanical/analog phase detectors with digital edge detection and quotient calculation, the system achieves high precision phase measurement at frequencies where analog methods fail, while maintaining manageable device complexity through software-based processing
Data Source
AI summary
Techniques for estimating a phase relation between a first binary signal and a second binary signal, in particular to a clock-to-data phase detection in double-data-rate signals. The binary signals may include both rising and falling signal edges. Techniques may include determining a first and second signal edge for the first binary signal and comparing the signal edges of the first binary signal to one or more signal edges of the second binary signal, then performing one or more calculations based on the comparisons. The phase relation between the first binary signal and the second binary signal may be determined based on the one or more calculations.