Instrument Function
R&S
®
SMBV100A
323Operating Manual 1407.6062.32 ─ 08
Global Trigger/Clock/Input Settings - Digital Modulation
Calls the "Global Trigger/Clock/Input Settings" menu. This menu is used among other
things for setting the trigger threshold, the input impedance and the polarity of the clock
and trigger inputs.
The parameters in this menu affect all digital modulations and standards, and are descri-
bed in the chapter 5.2.3.12, "Global Trigger/Clock/External Input Set-
tings", on page 121.
SCPI command:
n.a.
5.8.4 Arbitrary Waveform Generator ARB
The Arbitrary Waveform Generator (ARB) is an I/Q modulation source forming an integral
part of the R&S Signal Generator. It can be used to output any externally calculated
modulation signals or internally generated multi carrier signals or waveform files.
The Arbitrary Waveform Generator is available for instruments equipped with option
Baseband Generator (R&S SMBV-B10) or with any of the ARB only options (R&S SMBV-
B50/B51).
The three Baseband Generator options feature different ARB memory sizes (see data
sheet). Apart from the memory size, however, the three options offer the same function-
ality, either one can be installed.
Sources for waveform files
The R&S Signal Generator can generate ARB waveforms internally. The ARB generator
enables the calculation and the generation of multi segment and mutli carrier waveform
files. Several digital standards provide the special function "Generate Waveform File" and
enable the calculation and storage of the signal as a waveform file that can be afterwards
processed by the ARB generator.
The ARB can also process externally generated waveform files, e.g. the waveform files
generated on a PC by the Windows software package R&S WinIQSIM2 or signals cal-
culated using a mathematical program such as Matlab. For more information, see Appli-
cation Note 1MA28, “IQWizard - I/Q Signal Measurement and Conversion”, which can be
obtained from the Rohde&Schwarz web site at http://www.rohde-schwarz.com.
The externally generated waveform files can be loaded into the instrument via one of the
available interfaces (USB, LAN or GPIB).
Multi segment and multi carrier waveforms
To fulfill the requirements of some test systems and to enable rapid alternation between
different waveforms with differing test signals, the R&S Signal Generator provides the
functionality to generate multi segment waveform files. A multi segment waveform is a
combination of multiple waveforms called segments. Each segment represents a com-
pletely independent waveform that can be output with its own marker and clock settings.
The entire multi segment waveform is loaded into memory. The segment intended to be
output at any given moment can be selected by the user. It is therefore possible to alter-
Baseband Signal - Baseband Block
To Next Page
Loading...
