Periodic Jitter (PJ) Measurement Methodology
AssigneeGuideTech Inc.
InventorSassan Tabatabaei
Life of this patent
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Abstract
Methodologies are disclosed for analyzing periodic jitter is a signal pattern using a continuous time interval analyzer. Sampled signal patterns may be correlated using time interval error calculations to determine start and stop sequences within sampled blocks of signal data while sampling synchronization may be achieved based on time interval calculations or pattern interval error calculations.
Claims7
1-12. (canceled)
A method for synchronizing measurements of samples taken from a signal pattern containing a binary sequence with rising and falling edges, the signal pattern including a jitter component, comprising the steps of:
- sampling a first predetermined number of blocks of a signal pattern;
- creating possible expected start edge locations;
- creating possible expected stop edge locations;
- selecting a subset of samples in a selected measurement block;
- computing the mean square of differences between expected start edges and stop edges;
- and
- finding the pattern edge number within the sampled block having yielding a mean square difference which is at least a predetermined number of times larger than the mean square difference corresponding to that computed for other pattern edge numbers.
A method for synchronizing measurements of samples taken from a signal pattern containing a binary sequence with rising and falling edges, the signal pattern including a jitter component, comprising the steps of:
- sampling a first predetermined number of blocks of a signal pattern;
- creating possible expected start edge locations;
- creating possible expected stop edge locations;
- computing for each pattern edge a residual of start event number to the number of pattern edges;
- computing the average pattern interval error for the sampled edges;
- generating an expected time interval for each pattern interval error sequence;
- computing the mean square of differences between expected pattern interval error and measured pattern interval error for start edges and stop edges;
- and
- finding the pattern edge value within the sampled block having a difference mean square value at least a predetermined number of times larger than the difference mean square value corresponding to that computed for other pattern edge values.
Dependencies are inferred from the claim text.