Rohde & Schwarz SMU200A - Signal Routing and Frequency Shifting

Instrument Function
R&S
®
SMU200A
444Operating Manual 1007.9845.32 ─ 15
5.9.1.2 Signal Routing and Frequency Shifting
A frequency offset and a path gain can be set in the corresponding menu items of the
"BB Input" block menu.
For two-path instruments, the routing of the signals can be defined in the "Signal Rout-
ing" section of the "BB Input block".
The section "Path Gain" is used to enter the relative gain of the external signal compared
with the signals of the other baseband sources.
The section "Signal Routing" is used to define the signal routes of a external baseband
signals in two-path instruments.
Frequency Offset
Enters the frequency offset for the external baseband signal.
The offset affects the signal on the output of the "Baseband" block.
It shifts the useful baseband signal in the center frequency.
Note: For sample rates of exactly 100 MHz (Baseband In Mode Digital Input, i.e. Sample
Rate Source User Defined) it is not possible to enter a frequency offset. The digital signal
is fed into the signal path directly and not routed to the resampler where the frequency
offset takes place.
The complex I/Q bandwidth of the shifted useful signal must not exceed 80 MHz in total
(see also "Frequency Offset" on page 322).
The following applies:
f
offset
- f
use
/2 >= - 80MHz/2 and f
offset
+ f
use
/2 <= + 80MHz/2
f
use
= the complex useful bandwidth of the I/Q signal before the offset.
f
offset
= frequency offset.
External Baseband Signal - Baseband Input