Reference Clock Eye-Diagram Measurement for High-Speed DUT Signals
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Solution Overview
Problem
Current eye-diagram measurement methods for assessing signal distortion in high-speed communications channels are time-consuming and require multiple equipment connections, limiting their efficiency and practicality for characterizing passive communications channels.
Innovation Solution
A measurement system and method utilizing a reference clock synthesizer to generate master and derived reference clock signals, which are used by a transmitter and receiver unit to send and detect test signals through a device under test, allowing for efficient temporal signal measurement and eye-diagram analysis with a single test equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If BER measurement is used to characterize passive communications channels, then measurement accuracy is improved, but measurement time increases significantly
Solution Approach 1:
The patent uses eye-diagram measurement as a visual copy or representation of signal quality characteristics, allowing rapid assessment of signal distortion without performing time-consuming BER measurements. The eye diagram captures essential signal integrity information in a single visual display, providing a fast alternative to exhaustive error counting.
2Productivity
If eye-diagram measurement is used for signal assessment, then measurement speed is improved, but measurement precision may be compromised
Solution Approach 1:
The measurement system segments the signal analysis into multiple parameters extracted from the eye diagram, including eye height, eye width, crossing point, and various distortion metrics. This segmentation allows the system to capture multiple aspects of signal quality simultaneously from a single eye-diagram display, maintaining comprehensive measurement precision while preserving the speed advantage of visual measurement methods.
3Adaptability or versatility
If multiple measurement equipment are connected for eye-diagram measurement, then measurement capability is improved, but system complexity increases
Solution Approach 1:
The patent combines the transmitter, receiver, and measurement control functions into a single integrated test equipment unit. This merging eliminates the need for multiple separate equipment connections, reducing system complexity while maintaining comprehensive measurement capability. The integrated design allows all measurement functions to be performed through one unified device, simplifying the test setup.
4Measurement precision
If multiple measurement equipment are used for temporal signal measurement, then measurement accuracy is improved, but ease of operation deteriorates
Solution Approach 1:
The test equipment is designed with universal multi-functionality, capable of performing various temporal signal measurements including eye-diagram analysis, jitter measurement, and distortion assessment within a single device. This multi-functionality eliminates the need to operate multiple specialized equipment, making the test setup easier to operate while maintaining measurement precision through integrated measurement algorithms.
Data Source
AI summary
A measurement system of a device under test (DUT) includes a reference clock synthesizer configured to generate a master reference clock signal, a transmitter unit connected to the reference clock synthesizer and configured to connect to the DUT, and a measurement control system connected to the transmitter unit and configured to control the transmitter unit to generate a test signal pattern based on a first reference clock signal derived from the master reference clock signal, and generate a signal for passing through the DUT based on the test signal pattern. A receiver unit connected to the reference clock synthesizer is configured to connect to the DUT and to detect the signal and generate a digital signal based on the signal and a second reference clock signal derived from the master reference clock signal. The measurement control system is configured to provide an output signal based on the digital signal.