Jitter Measurement Correction via CDF Interpolation
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Solution Overview
Problem
Existing jitter measurement methods using probability density function (PDF) analysis are affected by non-linear strobe signal timings, leading to errors in jitter distribution parameter and component estimates due to variable delay circuit non-linearity.
Innovation Solution
A correcting apparatus and method that interpolates a cumulative distribution function (CDF) to correct PDF measurements by calculating values at ideal timings, generating a corrected PDF that accounts for errors in strobe timing non-linearity, thereby improving accuracy in jitter measurement and separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a PDF is generated by measuring transition edge timings using a strobe signal from a variable delay circuit, then the measurement can be performed, but the non-linearity of the variable delay circuit causes non-linear strobe timings that introduce measurement errors
Solution Approach 1:
The patent applies preliminary action by pre-calculating correction values for the non-linear strobe timings before performing the actual jitter measurement. The system stores correction data that compensates for the variable delay circuit non-linearity, allowing the measurement to proceed efficiently while maintaining accuracy through pre-applied corrections.
Solution Approach 2:
The patent changes the timing parameters of the strobe signal by applying correction values to compensate for non-linearity. The system adjusts the strobe timing parameters based on pre-calculated correction data, transforming the non-linear timing into effective linear timing for accurate jitter measurement.
2Ease of operation
If strobe timings are used at non-linear intervals due to variable delay circuit non-linearity, then the measurement process can proceed, but the resulting PDF includes measurement errors
Solution Approach 1:
The patent implements feedback by using pre-calculated correction data that compensates for the known non-linearity of the variable delay circuit. The correction values are applied based on the actual strobe timing deviations, creating a feedback mechanism that corrects the measurement data to reflect accurate jitter characteristics despite the non-linear timing.
Solution Approach 2:
The patent introduces correction data as an intermediary element between the non-linear strobe timing and the final jitter measurement. This correction data acts as a mediator that translates the non-linear timing information into accurate jitter parameters, allowing the measurement system to maintain reliability despite the non-linear timing source.
3Adaptability or versatility
If the variable delay circuit and ADC are used to generate strobe signals, then the measurement apparatus can operate, but the non-linearity introduces errors in jitter estimates
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction values for the non-linear characteristics of the variable delay circuit and ADC. These correction values are computed in advance based on the known non-linearity of these components, allowing the system to maintain high measurement precision without requiring more complex real-time correction mechanisms.
Solution Approach 2:
The patent changes the timing parameters by applying correction values that compensate for the non-linearity of the variable delay circuit and ADC. This parameter adjustment transforms the erroneous timing data into accurate jitter measurements, maintaining estimation precision while preserving the functionality of the existing hardware components.
Data Source
AI summary
There is provided a correcting apparatus for correcting a PDF obtained from a measurement result of measuring a characteristic of a measurement target at strobe timings including errors with respect to ideal timings at predetermined intervals, the correcting apparatus including: an interpolation section that is supplied with a CDF of the measurement result, interpolates a value between each strobe timing of the CDF, calculates a value of the CDF at each of the ideal timings, and calculates a corrected CDF at the ideal timings; and a corrected function generating section that generates a corrected PDF in which the errors of the strobe timings for the PDF have been corrected, based on the corrected CDF calculated by the interpolation section.