Rohde & Schwarz SMU200A - Data and Signal Sources in Baseband

Instrument Function
R&S
®
SMU200A
327Operating Manual 1007.9845.32 ─ 15
"Route to path
A"
The baseband signal is introduced into path A. The signals from both
paths are summed if necessary.
"Route to path
B"
The baseband signal is introduced into path B. The signals from both
paths are summed if necessary.
"Route to path A
and B"
The baseband signal is introduced into path A and path B. The signals
from both paths are summed if necessary.
SCPI command:
[:SOURce]:BB:PATH:COUNt on page 579
[:SOURce<hw>]:BB:ROUTe on page 580
5.8.2 Data and Signal Sources in Baseband
This section describes the common characteristics of the signals used for generating the
baseband signal for all standards, including for example all listed data sources. The
selection in the digital menus at any given time depends on the parameter and standard
concerned and is clear from the selection list offered in the menu. The external data
sources may therefore not be available in certain cases.
Characteristics which are uniquely specific to particular standards are described in the
corresponding manual.
For instruments equipped with option Baseband Input, R&S SMU-B17, externally gen-
erated analog baseband signals can be fed into the digital signal path via the analog I/Q
input "I IN" and "Q IN".
The following input signals are used when digital modulation signals are being generated:
●
Modulation data
●
Clock signals
●
Control signals
The input signals can be both internally generated and supplied from an external source.
The internally generated data and clock signals are output not only on the DATA and
CLOCK connectors but also on the corresponding pins of the AUX I/O interface.
In the case of two-path instruments, the external data and clock sources are permanently
allocated to path A, and data output is always for path A.
Likewise control signals and also trigger signals for triggering signal generation in the
R&S Signal Generator can be internally generated or supplied from an external source.
Up to four marker output signals for synchronizing external instruments can be user-
defined for each path.
Externally computed waveform files can be loaded in the instrument using computer
interfaces or IEC bus.
Waveform files are processed with the aid of the Arbitrary Waveform Generator (ARB),
see chapter 5.8.4, "Arbitrary Waveform Generator ARB", on page 376.
Internally the "Multi Carrier CW" menu for defining multi carrier waveforms is available
(see chapter 5.8.5, "Multi Carrier Continuous Wave", on page 422).
Baseband Signal - Baseband Block