R&S SMJ100A, Operating Manual

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Getting Started
R&S
®
SMJ100A
75 Operating Manual 1403.7458.32 ─ 14
3.3 Baseband Section
The baseband section of the R&S SMJ is fully digital and contains the hardware for
generating and processing I/Q signals.
For detailed information on available options, refer to the R&S SMJ data sheet and the
R&S SMJ configuration guide.
Up-to-date information is available at R&S SMJ homepage on the internet http://
www.rohde-schwarz.com/product/smj100a.html .
Baseband generator (option R&S SMJ-B10)
The generator produces baseband signals. It contains modules for real time signal
generation and an arbitrary waveform generator (ARB).
The different baseband options feature a different ARB memory size (see data sheet).
But apart from the memory size, all options have the same functionality and are instal-
led alternatively.
The option Baseband Generator contains real time Custom Digital Modulation and
ARB. Software options providing various digital standards are offered in addition.
Option R&S
SMJ-K40, for instance, generates signals to GSM/EDGE standard, option
R&S SMJ-K42 signals to 3GPP FDD standard.
Baseband main module (option R&S SMJ-B13)
At the end of the baseband path, the digital signal is converted to an analog I/Q signal.
The analog I/Q signal is fed to the I/Q modulator of the RF path. This module also
routes signals to the analog I/Q outputs. The module is absolutely required for coupling
out the baseband signal from the baseband section.
This module also offers digital I/Q impairment functions. The I/Q signal can be deliber-
ately corrupted, e.g. for testing the receiver quality.
Additional White Gaussian Noise (option R&S SMJ-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
SMJ-K62).
Digital output module (option R&S SMJ-B18)
The R&S SMJ can be equipped with a standardized digital I/Q interface (LVDS) for
online transfer of digital I/Q data. The digital output module (option R&S SMJ-B18)
enables the digital output of the I/Q baseband signal.
The R&S SMJ-B18 option can be used together with the R&S ® EX-IQ-BOX digital
interface module, providing a versatile digital baseband interface with various formats.
Baseband Section