Rohde & Schwarz SMU200A - AWGN Settings Dialog

Instrument Function
R&S
®
SMU200A
301Operating Manual 1007.9845.32 ─ 15
Scalable low-pass filters are used to produce a noise level with both a broad dynamic
range and a broad bandwidth range (from 1 kHz to 60 MHz).
Apart from the "Additive Noise" mode, there are also the "Noise Only" and the "CW Inter-
ferer" mode. In the "Noise Only" mode a pure noise signal is generated and modulated
to the carrier. In the "CW Interferer mode", a sinusoidal signal with an adjustable fre-
quency offset to the baseband signal is generated and added to the baseband signal by
means of a counter instead of a shift register.
5.7.2.1 AWGN Settings Dialog
To open the "AWGN Settings" menu for setting the noise generator, select "AWGN/IMP
> Configure > AWGN" or use the MENU key under "AWGN/IMP".
The "AWGN Settings" menu is divided into the following sections.
The RFI signal generator is activated, the mode selected and the interfering signal is
configured in the top section of the menu.
The level of the interfering signal is configured in the "Noise Level Configuration And
Output Results" section.
In "Additive Noise" and "CW interferer" mode, the interfering level can be defined and the
resulting total level displayed here.
In "Noise Only" mode, only the noise level can be set here.
AWGN Settings
The RFI signal generator is activated, the mode selected and the interfering signal is
configured in the top section of the menu.
State - AWGN
Activates/deactivates the RFI signal generator. The interferer (AWGN or CW interferer,
depending on the selected mode) is generated as after the generator is activated.
SCPI command:
[:SOURce<hw>]:AWGN:STATe on page 578
Mode - AWGN
Selects the mode for generating the interfering signal.
"Additive Noise"
The AWGN noise signal with selectable system bandwidth is added to
the baseband signal.
Impairment of Digital I/Q Signal and Noise Generator - AWGN/IMP Block