Concepts and Basic Terminology
R&S
®
SMW200A
1221User Manual 1175.6632.02 ─ 16
The Baseband and RF Domains
The processing blocks from the baseband source up to the I/Q modulator build the
baseband domain. The signal in the baseband domain is fully digital and is converted
to analog in the RF section of the instrument or if an analog output of the baseband
signal is required. On the block diagram, you can recognize the signal by the used line
weight: the digital signal is indicated with thick lines, whereas the analog signal is rep-
resented by thin lines.
The Figure C-2 illustrates the baseband and the RF domains.
Figure C-2: The "borders" of baseband and RF domains
Baseband Signal (Basebands), I/Q Streams, RF Signal
The Figure C-3 depicts the main terms used to denote the signal at the different pro-
cessing stages. The output signals of the "Baseband" blocks are referred as "base-
band signals" or "basebands". The signals at the end of the baseband domain are
called "streams" (input and output signals of the "I/Q Stream Mapper"). The RF modu-
lated output signal is denoted as RF signal.
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