R&S SMJ100A, Operating Manual

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Getting Started
R&S
®
SMJ100A
77 Operating Manual 1403.7458.32 ─ 14
One of the following options must be installed.
●
R&S SMJ-B103 (up to 3 GHz)
●
R&S SMJ-B106 (up to 6 GHz)
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 ).
3.4.1 Description of Individual Diagram Blocks of the RF Section
This section gives an overview of the available blocks and a detailed descritption of
their functions.
I/Q Mod A block
The (first) I/Q modulator is configured in this block. Also the Analog Wideband I/Q
mode can be selected here, which allows external I/Q signals to be directly applied to
the I/Q modulator, i.e. not via the baseband section. If no baseband modules are instal-
led, I/Q modulation is possible only in the Analog Wideband I/Q mode.
I and Q components can also be swapped (I/Q Swap). (Analog) I/Q impairments can
be set in addition. Unlike the impairments in the "AWGN/IMP" block, impairments in the
"I/Q Mod" block also affect the externally applied signals in the Analog Wideband I/Q
mode.
The status display in the block shows whether I/Q impairments and/or I/Q swap is
active. I/Q modulation is switched on or off with the TOGGLE ON/OFF key.
Note: An I/Q modulator provided in the R&S SMJ is automatically activated when a
connected baseband source is switched on. The I/Q modulator can also be separately
switched on and off (select the "I/Q Mod" block and press the TOGGLE ON/OFF key).
This permits the following configuration to be obtained with a single-path R&S
SMJ.
The baseband source generates an I/Q signal that is output via the analog I/Q output.
At the same time, the RF section generates an unmodulated carrier.
RF/A Mod A block
In this block, the RF parameters and the analog modulation modes are set.
The active analog modulation modes are displayed in the block. The TOGGLE
ON/OFF key switches the RF signal on and off. When the RF signal is switched off, the
switch before the RF output symbol is open.
RF settings include:
●
Frequency and reference frequency
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Attenuator settings.
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Frequency and level sweep
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List Mode settings. In this mode, extremely fast frequency and level settings can be
made.
RF Section