Jitter analysis and clock data recovery
R&S
®
RTO6
1075
User Manual 1801.6687.02 ─ 05
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
RTO6 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.
"Hardware
CDR"
The clock is generated from the source signal by the integrated CDR
circuitry. To configure the CDR, tap the "Hardware CDR setup" but-
ton.
The HW CDR must be active to perform the measurement. To acti-
vate HW CDR, use the trigger type "CDR", or the trigger type "Serial
pattern" with active CDR.
Note:
For TIE measurement results with HW CDR, set "UI offset = 0".
Other values introduce a timing offset in the results.
Remote command:
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
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
RTO6-K12).
Remote command:
MEASurement<m>:AMPTime:CLCK<n>:LSELect
Jitter measurements (options R&S
RTO6-K12/K13)
