266 Keysight M8000 Series of BER Test Solutions User Guide
5 Setting up Generator
De-Emphasis Signal Generator
The M8020A/M8030A has a built-in de-emphasis signal generator that
can be connected between the Data Out port of the generator and the
DUT.
De-emphasis is a method that reduces the voltage of a digital signal if the
generated level is high or low for more than one clock period. The principle
is illustrated in the following figure.
The de-emphasis amplitude is specified as a fraction of the output
amplitude (in percent or dB).
Post-cursor de-emphasis
The figure above refers to a so-called post-cursor de-emphasis. You may
wish to know how that is generated.
• One branch has a programmable amplifier to produce the desired
output voltage (Peak to Peak Voltage).
If the standard enabling procedure with termination voltage(s) and
impedance checks fails the output(s) will stay off. In this state the output
resistance is "high impedance". It can be switched on again (manually by
the user) after removing the fault condition, it again follows the standard
enabling procedure with termination voltage(s) and impedance checks.
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