Jitter analysis and clock data recovery
R&S
®
RTO6
1096
User Manual 1801.6687.02 ─ 05
Table 18-3: Advanced jitter components measurements
Measurement
Abbrevia-
tion
Description
Resu
lts
Diagram
S
t
d
D
e
v
a
p
/a
b
s
H
is
t
o
g
r
a
m
T
r
a
c
k
S
p
e
ct
r
u
m
Total jitter at
BER
TJ@BER
The eye closure at the user-defined target BER.
x
Total jitter
TJ
Measures the total Time Interval Error (TIE) of the
input signal.
It is defined as the time between each transition of
the input signal and its corresponding reference
clock transition.
x
x
x
x
x
Deterministic
jitter
DJ
The reproducible portion of the overall TIE of the
input signal.
It consists of the Data Dependent Jitter (DDJ), Peri-
odic Jitter (PJ) and the Other Bounded Uncorrelated
Jitter (OBUJ) components.
x
Data-depend-
ent jitter
DDJ
Consists of Inter-symbol Interference (ISI) and Duty
Cycle Distortion (DCD).
It depends on the symbol sequence. ISI is an effect
commonly caused by limited signal bandwidth in the
transmitter and transmission line, which forces influ-
ence from past symbols onto future symbols. DCD is
a mismatch between rising and falling signal transi-
tions due to reference level mismatch or other imbal-
ances between transitions.
x
x
x
x
x
Duty cycle dis-
tortion
(3)
DCD
Measure of imbalance between rising and falling
data transitions. It is defined as the time difference
between the average rising and average falling edge.
x
Random plus
(other) boun-
ded uncorrela-
ted jitter
RJ + (O)BUJ
Random jitter plus bounded uncorrelated jitter/ other
bounded uncorrelated jitter is the combined effect of
both jitter types.
If periodic components are activated, RJ + OBUJ is
displayed. Otherwise RJ + BUJ.
RJ + (O)BUJ is typically used, if track or spectrum
plots are desired. Both plots are not available for RJ
only or (O)sBUJ only components as the time
dependencies of these jitter types are unknown. RJ
+ (O)BUJ spectrum is a useful approximation of the
RJ spectrum for negligible small (O)BUJ.
x
x
x
x
x
(1)
(2)
> "Enabled".
(3)
No results available, if "Transitions" is set to "Rising"/"Falling".
Advanced jitter and noise (option R&S
RTO6- K133/K134)
