Jitter Component Isolation via Curve Fitting
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Solution Overview
Problem
Current jitter measurement technologies fail to effectively isolate horizontal and vertical jitter components in digital systems, leading to difficulties in identifying sources of jitter and optimizing signal transmission performance, especially at higher data rates.
Innovation Solution
A system and method that utilize a digital oscilloscope to measure total jitter and distinguish between horizontal and vertical jitter components by fitting curves to waveforms, determining slope and statistical variance, and subtracting vertical jitter to approximate actual signal jitter, allowing for improved jitter analysis without prior knowledge of bit patterns or synchronization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If total jitter measurement is performed without component separation, then measurement simplicity is maintained, but measurement precision deteriorates due to inability to identify specific jitter sources
Solution Approach 1:
The patent segments total jitter into distinct horizontal and vertical components through curve fitting and variance analysis. By dividing the jitter measurement into separable dimensions (horizontal timing jitter and vertical amplitude jitter), the system enables identification of specific jitter sources while maintaining a unified measurement approach.
Solution Approach 2:
The patent introduces curve fitting as an intermediary process between raw jitter measurement and component identification. The fitted curve serves as a mediator that allows extraction of horizontal and vertical jitter components from the total jitter signal without requiring direct access to separate measurement channels.
2Productivity
If jitter measurement is performed at higher data rates, then productivity increases, but measurement precision deteriorates due to decreased timing margins
Solution Approach 1:
The patent transitions from one-dimensional timing-based jitter measurement to two-dimensional analysis by separating horizontal (timing) and vertical (amplitude) components. This dimensional separation allows independent analysis of timing jitter despite reduced timing margins at higher data rates, as vertical component information provides additional measurement context.
3Measurement precision
If curve fitting is applied to separate jitter components, then measurement precision improves through component isolation, but device complexity increases due to additional processing requirements
Solution Approach 1:
The curve fitting process is designed to be self-sufficient, using only the acquired waveform data to generate both the fitted curve and the jitter component measurements. The system serves itself by extracting all necessary information (horizontal jitter, vertical jitter, and their relationship) from the same data set without requiring external reference signals or additional measurement equipment.
Data Source
AI summary
Apparatus and associated systems, methods and computer program products relate to isolating horizontal jitter component(s) from vertical jitter component(s). In preferred embodiments, at least one horizontal component of jitter is distinguished from at least one component of vertical jitter by fitting a curve to a digitally acquired waveform, determining the curve slope and statistical variance about the fitted curve over at least one time period, identifying a functional relationship between the variance and slope, and determining therefrom at least one horizontal component of jitter and at least one vertical component of jitter. Random and deterministic jitter components may be aggregated, in certain embodiments, so as to identify a vertical jitter component that reflects both deterministic and random jitter. In preferred implementations, the isolated vertical jitter component is subtracted from a total jitter measurement so as to better approximate actual signal jitter.