Configuring the Internal Baseband Source
R&S
®
SMBV100B
90
User Manual 1178.4460.02 ─ 03
on page 85). The selection in the dialogs at any given time depends on the parameter
and standard concerned. It is clear from the selection list offered in the dialog. Some
parameters are therefore not available in certain cases.
Characteristics which are uniquely specific to particular standards are described in the
corresponding user manual.
For the generation of modulation signals, the instrument uses the following input sig-
nals:
●
●
●
Signal sources
The data, the clock and the trigger signals can be both internally generated and sup-
plied from an external source. Control signals however are always generated internally.
Depending on the current configuration, the internally generated data and marker sig-
nals are output on one or several connectors. The output capabilities of the instrument
and the required connectors are configurable.
See
Chapter 10.2, "Configuring the Global Connectors"
Internal Modulation Data
The R&S
SMBV100B uses the following internal modulation data sources:
●
Data lists
Data lists are externally or internally created binary lists with modulation data.
The instrument provides standard file select function for loading of existing data
lists, creating internally new data lists or editing an existing one. Internally, data
lists are created in the dedicated "Data List" editor (see
on page 128). A separate file is created for each list and stored on the
instrument's hard disk. The filename is user-defined; the file extension is
*.dm_iqd
.
The maximum length of a data list is determined by the size of the data list memory
(see data sheet). There is no restriction on the number of lists that can be stored.
Settings for file handling, like transferring external data lists to the instrument, or
renaming of folders and files, are accessed via the standard "File Manger" function.
(See also
Chapter 9, "File and Data Management"
●
Data patterns
Simple data patterns such as binary 0 ("All 0") strings or 1 ("All 1") strings or vari-
able bit strings with a maximum length of 64 bits can be used as internal modula-
tion data.
●
PRBS data
The PRBS generators deliver pseudo-random binary sequences of differing length
and duration. They are known as maximum length sequences. PRBS sequences
are generated with the aid of ring shift registers with feedback points determined by
the polynomial.
Common Functions and Settings in the Baseband Domain
