SiT-AN10007 Rev.
1.
0
6 February 2009
Clock Jitter and Measurement
1 Introduction
Jitter is the timing variations of a set of signal edges from their ideal values.
Jitters in clock
signals are typically caused by noise or other disturbances in the...
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SiT-AN10007 Rev.
1.
0
6 February 2009
Clock Jitter and Measurement
1 Introduction
Jitter is the timing variations of a set of signal edges from their ideal values.
Jitters in clock
signals are typically caused by noise or other disturbances in the system.
Contributing factors
include thermal noise, power supply variations, loading conditions, device noise, and
interference coupled from nearby circuits.
2 Types of Jitter
Jitter can be measured in a number of ways; the following are the major types of jitter:
Period Jitter
Cycle to Cycle Period Jitter
Long Term Jitter
Phase Jitter
Time Interval Error (TIE)
2.
1 Period Jitter
Period jitter is the deviation in cycle time of a clock signal with respect to the ideal period over a
number of randomly selected cycles.
If we were given a number of individual clock periods, we
can measure each one and calculate the average clock period as well as the standard deviation
and the peak-to-peak value.
The standard deviation and the peak-to-peak
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