Jitter analysis and clock data recovery
R&S
®
RTO6
1070
User Manual 1801.6687.02 ─ 05
Table 18-1: Jitter measurements
Measurement
Description/Result
∆
Cycle-cycle jitter
Difference between the periods of two adjacent cycles. The measure-
ment is based on the period measurement. You can select the slope
and the reference level on which the period is measured.
Δ
T
Period k
= T
Period k+1
- T
Period k
for
k = 1,...,K-1
Chapter 18.1.2.2, "Settings for clock measurements"
∆
N-cycle jitter
Difference between the time of two adjacent groups of N cycles (peri-
ods) each. You can select the slope and the reference level on which
the time is measured, and the number of periods in the groups.
Δ
T
Ncycle k
= T
Ncycle k+1
- T
Ncycle k
for
k = cycle group index
...
...
...
N periods
N periods
T
Ncycle1
T
Ncycle2
ΔT
Ncycle1
= T
Ncycle2
- T
Ncycle1
∆
Cycle-cycle width
Difference between the pulse width of two adjacent cycles. The mea-
surement is based on the pulse width measurement. You can select
the pulse polarity to be measured.
Δ
T
Pulse k
= T
Pulse k+1
- T
Pulse k
for
k = 1,...,K-1
∆%
Cycle-cycle duty cycle
Difference between the duty cycle of two adjacent cycles. The mea-
surement is based on the duty cycle measurement. You can select the
pulse polarity for the duty cycle measurement.
Δ
R
Cyc k
= R
Cyc k+1
- R
Cyc k
for
k = 1,...,K-1
Time interval error
Time difference between the slope of the input signal and the slope of
a reference signal. The reference signal can be a captured clock
waveform, or a clock generated by clock data recovery (CDR, software
algorithm or hardware generation). You can select the slope and the
reference level on which the TIE is measured.
TIE
k
= t
Signal k
- t
Clock k
for
k = 1,...,K
Chapter 18.1.2.3, "Data measurement settings"
Unit interval
Period of the clock signal. If no clock signal is available, it is recovered
by CDR. The period is calculated as the time difference between two
consecutive clock edges of the same polarity.
UI
k
= t
Clock k+1
- t
Clock k
for
k = 1,...,K-1
Jitter measurements (options R&S
RTO6-K12/K13)
