Instrument Function
R&S
®
SMU200A
325Operating Manual 1007.9845.32 ─ 15
Path Gain
Enters the path gain for the baseband signal of the selected path compared to the base-
band signal of the other path.
In case an external baseband input ("BB Input") is used, this parameter also determines
the path gain for the baseband signal of the selected path compared to the baseband
signal of this external data source.
The gain affects the signal on the "Baseband block" output.
Note: In case the baseband signal is additionally faded and routed at the output of the
fading simulator, so that the faded signals from both paths are summed, the real path
gain is measured at the output of the "Fading" block and set with the fading parameter
"Summation Ratio A/B" (see description “Fading Simulator”, section “Summation Ratio
A/B”).
The relative gain set with the parameter "Path Gain" in the "Baseband" block is ignored.
The "Path Gain" of the different baseband sources define the relative gain of the asso-
ciated signals. The real gain depends on the following parameters along with the set path
gain:
●
Signal characteristics, in particular the crest factor
●
Number of baseband sources
●
Overall RF output level.
The sum baseband signal can be verified in the spectrum display in the "Graphics" block.
SCPI command:
[:SOURce<hw>]:BB:PGAin on page 579
Signal Routing
Selects the signal route for the baseband signal of a two-path instrument.
The following table shows the combination of signal routes allowed for two-path instru-
ments.
Baseband Signal - Baseband Block
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