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SDS6000L User Manual
int. s i g l e n t . c o m 2 6 9
RJ
Random jitter (RJ) also called Gaussian jitter, is unpredictable
electronic timing noise. RJ is caused by thermal noise in an electrical
circuit or due to the central limit theorem. Random jitter is unbounded
and commonly specified by the standard deviation σ. Due to its
irregular nature, random jitter (RJ) is uncorrelated to any other signal
and unpredictable in timing behavior.
DJ
Deterministic jitter, the observed peak-to-peak value will not grow
over time, has a bounded distribution.
DCD
Duty cycle distortion (DCD) is the difference between mean TIE for
rising edges and mean TIE for falling edges. Asymmetrical rise-time
vs. fall-time and non-optimal choice of decision threshold will cause
DCD.
DDJ
Data-dependent jitter (DDJ) has several discrete line distributions,
mainly caused by ISI, the physical/electrical effect. There will be
different zero-crossing positions, due to transmission line effects like
reflections and the step response of the system.
PJ
Periodic jitter (PJ) is mainly caused by periodic signal interference on
the board, including power supply ripple, clock crosstalk, etc.
Periodic interference can directly cause phase modulation of the
observed signal.
TJ@BER
Total jitter (TJ) is computed with a required bit error rate (BER) for
the system:
The value of
changes according to different bit error rates. A
common BER used in communication standards such as Ethernet is
10−12,
Part of the measurements can be displayed in frequency domains. Click the Spectrum in the dialog
of jitter measure to enter the frequency domain setting.
The vertical and horizontal parameters can be adjusted for better observation.
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