Automated Eye Diagram Scan Circuit for Receiver Signal Integrity
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Solution Overview
Problem
Current eye diagram scanning methods for receiver circuits are labor-intensive, resource-consuming, and prone to errors due to low automation, and they fail to accurately reflect the operational performance of receiver circuits, especially when dealing with jitter-induced signal degradation.
Innovation Solution
An automated eye diagram scan circuit with a control module, phase interpolator, level adjust circuit, and access circuit that provides multiple eye diagram scan results by adjusting phase and voltage offsets, allowing for real-time tracking and comparison of data signals to determine successful or failed access, thereby reducing human and hardware resource requirements and accurately reflecting the receiver circuit's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual adjustment and monitoring is used for eye diagram scanning, then flexibility and adaptability are maintained, but automation degree is low and human resource consumption is high
Solution Approach 1:
The eye diagram scanning system performs self-testing and self-evaluation by automatically generating test signals, adjusting parameters, and analyzing results without external intervention. The receiver circuit under test evaluates its own performance through built-in comparison logic that determines pass/fail status based on eye diagram parameters, eliminating the need for manual operation while maintaining comprehensive testing capability
Solution Approach 2:
The scanning system is designed to test multiple receiver circuits simultaneously using parallel test channels. The same test equipment can evaluate different circuits with different parameters (voltage levels, time offsets, jitter conditions) without requiring separate dedicated equipment for each circuit, thereby reducing overall system complexity while achieving high automation across multiple test points
2Measurement precision
If repeated comparisons are performed to obtain statistically meaningful results, then measurement precision improves, but time consumption increases
Solution Approach 1:
The system pre-configures optimal test parameters including voltage levels, time offsets, and comparison thresholds based on expected signal characteristics before actual testing begins. By establishing the evaluation framework and parameter ranges in advance, the system can perform rapid repeated comparisons within predefined boundaries, achieving statistical significance without exhaustive searching that would consume excessive time
Solution Approach 2:
The eye diagram scanning employs periodic sampling and comparison operations at optimized intervals rather than continuous monitoring. The system performs comparisons at specific phase points and voltage levels systematically, repeating the process multiple times to build statistical data. This periodic approach concentrates measurement efforts at critical points, achieving precise statistical evaluation more efficiently than continuous or random sampling
3Measurement precision
If output signal is used directly for eye diagram scanning, then hardware resources are saved, but jitter-induced degradation affects scanning accuracy
Solution Approach 1:
The system extracts and separates the clock signal from the data signal paths for independent evaluation. By taking out the clock recovery function and comparing it separately against the original reference clock, the system can measure jitter characteristics independently without them degrading the eye diagram scanning accuracy. This extraction allows the data path to be evaluated purely for eye diagram parameters while the clock path is evaluated separately for timing jitter
Solution Approach 2:
The system introduces an intermediary reference clock signal that serves as a stable comparison基准 for both the original clock and the recovered clock. This intermediary reference allows simultaneous evaluation of clock jitter and data integrity without one affecting the other's measurement accuracy. The reference acts as a mediator that decouples the measurement of timing variations from the measurement of signal quality
Data Source
AI summary
Eye diagram scan circuit and associated method for a receiver circuit, including a level adjust circuit, a phase interpolator and a control module. The receiver circuit provides a first data signal and a primary phase data according to a received signal. The control module provides a phase offset data and a level offset data. The level adjust circuit adjusts a level of the received signal in respond to the level offset data; the phase interpolator triggers according to a sum of the phase offset data and the primary phase data, so a second data signal is provide in response to the level-adjusted received signal. The control module compares the first data signal and the second data signal, and accordingly provides an eye diagram scan result for the phase offset data and the level offset data.