Keysight M8194A - Page 79

Keysight M8194A 120 GSa/s Arbitrary Waveform Generator User Guide 79
M8194A Soft Front Panel 3
• Coding/Mod.
This drop-down list selects the different channel coding and
modulation schemes that are supported (see list above). NRZ is the
default selection.
• Bit/Signaling Rate
This edition field should be used to enter the signaling speed (or
baud rate) for the modulated signal expressed in Bauds (1 Baud = 1
Symbol/s). Baud rate is equal to the bit rate for two-level line coding
schemes. 4GBaKeysight TechnologiesKeysight Technologiesud is
the default value.
• Edge Shape
This drop-down list allows the selection of shape for the transitions
(edges); choices are ‘Rectangular’, ‘Trapezoidal’ (linear), First Order’
(RC network), ‘Gaussian’, ‘Bessel Thompson’ (4th order
Bessel-Thomson reference receiver filter), ‘Raised Cosine’ and ‘Root
Raised Cosine’ (Square Root Raised Cosine).‘
Notes:
• The default edge shape is ‘Gaussian’.
• For clock signals (i.e. the Clock Toggle button is set to ‘C/2’ or
‘C/4’) the edge shape is always Gaussian.
• Thresholds
This drop-down list sets the level threshold convention for the
measure rise/fall time parameters. Choices are b_20_80 (20%-80%)
and b_10_90 (10%-90%). 20%-80% is the default selection for this
control.
• Rise Time (UI)
Rise/fall times can be set-up through this edition field. Time must be
expressed in UIs (Unit Interval) as a fraction of the symbol duration.
Rise time can be set up for all the edges shapes except for the
Unfiltered, Raised-Cosine and Square Root of Raised-Cosine
shapes. Rise time is fixed for clock signals to two sample periods in
order to minimize clock jitter. 400mUI (0.4 UI) is the default value for
this field.
• Alpha
This edition field only shows up when the Raised Cosine and
Square-root of Raised Cosine edge shapes are selected. With it, the
excess bandwidth parameter (alpha) of the isolated pulses can be
set up. Alpha = 1.0 is the default value.