Getting Started
R&S
®
SMBV100A
66Operating Manual 1176.8016.02 ─ 17
Digital Baseband Connectivity (option R&S SMBV-K18)
This option activates the DIGITAL IQ IN/OUT interface in order to apply an external
signal to the baseband path, or to provide the internally generated baseband signal.
Equipped with this option, the instrument indicates the "BB IN/Out" in the blockdia-
gram.
The interface enables you to directly transmit digital I/Q signals between R&S instru-
ments. In addition, if you use the digital signal interface module (R&S EX-IQ-BOX), you
get a versatile digital baseband interface for a variety of formats.
Special features...
●
Option R&S SMBV-K18 is a combined interface, i.e. it operates one direction at a
time.
●
The R&S SMBV processes either the internally generated baseband signal, or the
signal supplied externally. Therefore, the baseband signal generator is turned off
with "BB In", and vice versa.
●
If the baseband section and the RF section are decoupled, e.g. with output of the
digital I/Q signal, or if an external anaolg signal is fed to the I/Q modulator, both
sections can be processed independently.
Further processing of the I/Q signal
The R&S SMBV allows further processing of the I/Q signal, as summarized below:
●
In the "AWGN/IMP" block, the R&S SMBV allows the digital I/Q signal to be
impaired or added with noise before it is passed on.
Additionally, a pure noise signal can be used and forwarded. In this case, the I/Q
baseband signal is disabled, indicated by the interrupted signal flow in the diagram.
●
If digital I/Q output is on, the R&S SMBV routes the signal, or the pure noise,
directly to the digital interface.
●
If digital I/Q output is off, the instrument converts the signal to an analog I/Q sig-
nal and routes it to the analog I/Q output and to the I/Q modulator of the RF path.
Pure noise is also provided at the analog outputs or can be forwarded to the I/Q
modulator.
Additional White Gaussian Noise (option R&S SMBV-K62)
Additive white noise, which may be required for instance for measurements on mobile
radio base stations, can be produced with the AWGN software option (R&S SMBV-
K62).
Baseband Section
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