Pulse Signal Phase Detection Using Area Comparison Sampling
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Solution Overview
Problem
Conventional phase detectors in clock data recovery circuits inaccurately detect leading or lagging information of input signals, leading to incorrect sampling phase.
Innovation Solution
A method and apparatus for phase detection that involves receiving input pulse signals, calculating areas formed by the waveform curve and time axis before and after primary sampling points, comparing these areas to determine phase detection results based on pre-defined rules, using integration circuits, comparators, and phase detection logic circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional direct sampling method is used to detect phase, then the detection process is simple, but the phase detection accuracy is poor
Solution Approach 1:
The patent divides the phase detection process into multiple segments: first obtaining direct sampling data, then calculating first and second sampling output error information separately, and finally computing leading or lagging information through a specific formula. This segmentation allows accurate phase detection without requiring overly complex circuitry at any single stage.
Solution Approach 2:
The patent performs preliminary calculations of first sampling output error information and second sampling output error information before determining the final leading or lagging information. This preliminary action prepares the data in advance, enabling accurate phase detection while maintaining a manageable circuit complexity.
2Measurement precision
If conventional phase detection method is used, then the circuit structure is simple, but the sampling phase accuracy is insufficient
Solution Approach 1:
The patent employs feedback mechanisms where the calculated leading or lagging information is used to adjust the sampling phase. The phase detector continuously monitors the error information and adjusts the sampling timing accordingly, creating a closed-loop system that improves sampling phase accuracy while maintaining reasonable circuit complexity through iterative refinement.
Solution Approach 2:
The patent replaces traditional mechanical or direct sampling phase detection methods with a computational approach using error information calculations and mathematical formulas to determine leading or lagging information. This substitution enables higher precision phase detection through digital signal processing rather than relying solely on analog circuit characteristics.
3Measurement precision
If direct sampling is performed without area calculation, then the detection process is fast, but the phase leading or lagging information is inaccurate
Solution Approach 1:
The patent performs partial integration by calculating areas only over specific time intervals (first area before the sampling point, second area after the sampling point) rather than integrating over the entire signal period. This partial action provides sufficient accuracy for determining leading or lagging information while minimizing the time required for detection.
Solution Approach 2:
The patent pre-calculates the first and second sampling output error information and stores them for subsequent use in determining leading or lagging information. This preliminary calculation prepares the necessary data in advance, enabling fast phase detection without requiring time-consuming real-time integration during the critical detection phase.
Data Source
AI summary
This application discloses a method and apparatus for phase detection, the said method comprising: receiving input pulse signals; obtaining the primary sampling points of the input pulse signals; calculating the first area formed by the waveform curve of the input pulse signals and the time axis within the preceding unit time of the primary sampling point; calculating the second area formed by the waveform curve of the input pulse signals and the time axis within the subsequent unit time of the primary sampling point; comparing the size of the first area with the size of the second area to obtain the first comparison result; outputting the phase detection result of the input pulse signals based on the first comparison result and a pre-defined true value rule.