Instrument Function
R&S
®
SMU200A
446Operating Manual 1007.9845.32 ─ 15
The "Path Gains" of the different baseband sources (Baseband In A, Baseband In B,
Baseband A and Baseband B) determine the gain of the associated signals relative to
each other. The actual gain of the different baseband signals depends not only on the
path gain setting but also on the signal characteristics like the crest factor, on the number
of used sources and on the total output level.
The cumulative baseband signal can be verified in the "Graphics" block in the spectrum
view.
SCPI command:
[:SOURce]:BBIN:PGAin on page 695
Signal Routing
Selects the signal route for the external baseband signal of a two-path instrument. The
following table shows the combination of signal routes allowed for two-path instruments.
However, mirrored capabilities are not displayed (e.g. only the setting 3 x path A but not
also 3 x path B).
The following table shows some of the possible combinations of signal routes for two-
path instruments.
Table 5-13: Combinations of signal routings for two-path instruments
Routing base-
band A
Routing base-
band B
Routing base-
band In
Block diagram
Route to path A Route to path A Route to path A
Route to path A Route to path B Route to path A
Route to path A Route to path A
and B
Route to path A
Route to path A Route to path A
and B
Route to path B
Route to path A Route to path A
and B
Route to path A
and B
Route to path A
and B
Route to path A
and B
Route to path A
and B
"Route to path
A"
The external baseband signal is fed into pathA. If an internal signal from
pathA is generated at the same time, the two signals are summed.
External Baseband Signal - Baseband Input
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