Rohde & Schwarz RTP Series - Page 1019

Jitter analysis and clock data recovery
R&S
®
RTP
1019User Manual 1337.9952.02 ─ 12
Clock
Defines the origin of the clock signal - either an existing clock signal or waveform, or a
clock generated using one of the CDR methods.
The setting is available for the following measurements: time-interval error, unit interval
and data rate.
"Explicit signal"
The clock is an existing clock signal. Select the clock source, clock
slope, and the reference level.
"Software CDR
1 / 2"
The clock is generated by a software algorithm. The R&S RTP pro-
vides two setups for software CDR, which can be configured and
used independently. To configure the CDR, tap the "Software CDR
1/2 setup" button.
Remote command:
MEASurement<m>:JITTer:CDRMode on page 2258
Slope
Sets the edges that are used for measurements.
For time-interval error measurement, you set the data slope, and the clock slope if the
clock is a real signal. For unit interval and data rate measurements, you set only the
clock slope if the clock is a real signal.
"Positive"
The positive clock slope can be used, for example, for single data
rate (SDR) signals with bit start at the positive clock edge.
"Negative"
The negative clock slope can be used, for example, for SDR signals
with bit start at the negative clock edge.
"Either"
For clock edges, this option can be used for double data rate (DDR)
signals.
For data edges, it is the most common setting.
Remote command:
MEASurement<m>:JITTer:SOURce<n>:TIESlope on page 2259
Clock ref level
Selects the reference level of the clock on which the time is measured. The intersec-
tion of slope and reference level defines the time point for measurements.
The setting is used for setup and hold measurements, and for jitter measurements
(option R&S RTP-K12).
Remote command:
MEASurement<m>:AMPTime:CLCK<n>:LSELect on page 1377
Data ref level / Reference level
The setting defines the "Data ref level" for setup and hold measurements, and for time-
interval error measurements (option R&S RTP-K12). It selects the reference level of
the data signal on which the time is measured. The intersection of slope and reference
level defines the time point for measurements.
For clock jitter measurements (option R&S RTP-K12), it sets the "Reference level" for
the time measurement.
Remote command:
MEASurement<m>:AMPTime:DATA<n>:LSELect on page 1378
Jitter measurements (Option R&S
RTP-K12)