More about timing jitter – Teledyne LeCroy AORM - Advanced Optical Recording Measurements User Manual
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ISSUED:
June 2013
923133 Rev A
More About Timing Jitter
In order to understand the operation of the timing jitter parameter with different modes of
operation, consider the histogram of 3T to 5T pit widths in the next figure.
The Timing Jitter parameter considers each of these distributions separately. For each
distribution the standard deviation is calculated. This is the timing jitter displayed for each nT
distribution. Overall timing jitter is calculated by subtracting the mean width of each distribution
from the widths in those distributions and considering the resulting superposition.
The sigma of the 3T, 4T, and 5T distributions are what is obtained when the Timing Jitter custom
parameter is configured for single n values (the sigmas are the same as the sigma of the edge
shift calculation). The sigma of the resulting superposition is what is obtained when the Timing
Jitter custom parameter is configured for ranges of n values (in this case 3T to 5T).
2.5
3
3.5
4
4.5
5
5.5
0
200
400
600
3T Widths
4T Widths
5T Widths
Histogram of Pit Widths
Pit Width / T
Population