Jitter Determination via Step Response Analysis
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Solution Overview
Problem
Current methods for determining jitter components, such as Data Dependent Jitter (DDJ), in signals are inefficient due to long measurement times and limited accuracy, as they rely on averaging operations and approximations that assume all signals have the same slope, leading to unreliable results.
Innovation Solution
A method that involves determining a step response associated with the signal source and transmission channel to accurately calculate jitter components, including DDJ, by using a substitute model that fits signal parameters through regression analysis and minimizing a cost functional, allowing for simultaneous determination of data dependent jitter and periodic noise signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If averaging operations are used to determine jitter components, then measurement time is reduced, but accuracy and reliability of jitter component determination deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-determining the step response of the signal source before performing jitter component analysis. This pre-characterization allows subsequent jitter measurements to be performed faster without sacrificing accuracy, as the step response serves as a reference for calculating jitter components without requiring lengthy averaging operations
Solution Approach 2:
The patent introduces the step response as an intermediary element that mediates between the raw signal and jitter component calculation. By using the step response as an intermediate reference, the system can determine jitter components more accurately and efficiently without relying on time-consuming averaging of multiple signal samples
2Measurement precision
If signal length is increased to achieve high precision jitter measurement, then measurement accuracy improves, but measurement duration increases
Solution Approach 1:
The patent replaces the mechanical approach of extending signal length for higher precision with a computational method based on step response analysis. Instead of collecting more signal data over time, the system uses the pre-determined step response to calculate jitter components, substituting physical measurement extension with mathematical analysis
3Ease of operation
If ISI filters are used to estimate DDJ, then measurement process is simplified, but accuracy deteriorates due to approximation assumptions
Solution Approach 1:
The patent extracts the step response characteristics from the signal source separately from the jitter analysis process. By taking out the step response determination as a distinct preliminary step, the system eliminates the need for approximating all DDJ signals with the same slope, allowing each signal to be analyzed with its specific characteristics while maintaining measurement simplicity
Data Source
AI summary
A jitter determination method for determining at least one jitter component of an input signal is described. The input signal is generated by a signal source, including: receiving the input signal; determining a step response based on the decoded input signal, the step response being associated with at least the signal source; and determining the at least one jitter component of the input signal based on at least one of the input signal and the determined step response. Further, a measurement instrument is described.