Keysight M8000 Series of BER Test Solutions User Guide 321
Setting up Analyzer 6
M8020A/M8030A CDR Parameters
The M8020A/M8030A has the following parameters:
• Control: You can specify whether the CDR is controlled by the pattern
sequence or if it is manually enabled or disabled.
• CDR State - It enables or disables the CDR state.
• Transition Density: It affects the loop parameters, and it must be either
entered, or measured. Some standards define a loop bandwidth for a
specific transition density.
• Loop Order - The data stream contains multiple frequencies, and the
CDR needs to know the expected data rate. You can choose between 2
types of CDR; 1st order and 2nd order.
• Loop Bandwidth: It is the input parameter to set the characteristics of
the loop.
• Peaking: Additionally, you can set the value for peaking in the provided
field. It defines the second order CDR characteristics by defining a
peaking value which is valid for jitter transfer function. The peaking
parameter is only available for the second Loop Order.
CDR Setup for M8040A
The M8040A system does not have an internal CDR so the N1076A/77A
can be assigned to an M8046A error detector to be used as an external
clock recovery. In this case, M8046A will ensure that certain critical
parameters are automatically kept in sync between M8046A and
N1076A/77A. To use the N1076A/77A from within M8070A, the FlexDCA
N1000-Series System Software has to be started and fully running before
starting M8070A. Once all these instruments are connected, start the
M8070A software. For details on connections and how to access
N1076A/77A from within M8070A, refer to Controlling N1076A/77A from
M8070A on page 226.
Follow the given steps to perform a CDR Setup:
1Go to the Menu Bar > Analyzer and then select Data In.
2 Select Clock functional block from the Parameters window. The
following parameters will appear:
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