Instrument Function
R&S
®
SMU200A
302Operating Manual 1007.9845.32 ─ 15
"Noise Only"
The pure AWGN noise signal with selectable system bandwidth is modu-
lated to the carrier. The connection to the baseband is interrupted.
"CW Interferer"
A sine with a defined frequency offset is added to the baseband signal.
The calculation of E
b
/N
0
ratio is omitted.
SCPI command:
[:SOURce<hw>]:AWGN:MODE on page 574
System Bandwidth - AWGN
(Additive Noise and Noise Only)
Sets the RF bandwidth to which the set carrier/noise ratio relates.
Within this frequency range, the signal is superimposed with a noise signal whose level
corresponds exactly to the set C/N or S/N ratio.
Note: The noise signal is not generated arbitrarily for a particular bandwidth, but instead
it is generated in steps. Noise therefore also occurs outside the set system bandwidth.
SCPI command:
[:SOURce<hw>]:AWGN:BWIDth on page 570
Minimum Noise/System Bandwidth Ratio - AWGN
(Additive Noise and Noise Only)
Sets the ratio of minimum noise bandwidth to system bandwidth.
Note: The noise signal is not generated arbitrarily for a particular bandwidth, but instead
it is generated in steps. Noise therefore also occurs outside the set system bandwidth.
With this parameter the minimum real noise bandwidth can be set as required by some
standards. It does not influence the calculation of level from the set C/N or S/N ratio in
relation to system bandwidth.
The overall bandwidth is calculated as follow and may not exceed 80 MHz.
Overall Bandwidth = System BW x Minimum Noise/System BW Ratio
SCPI command:
[:SOURce<hw>]:AWGN:BWIDth:RATio on page 571
Noise Bandwidth - AWGN
(Additive Noise and Noise Only)
Indicates the real noise bandwidth. The value is only indicated for "State On".
Note: The noise signal is not generated arbitrarily for a particular bandwidth, but instead
it is generated in steps. Noise therefore also occurs outside the set system bandwidth.
SCPI command:
[:SOURce<hw>]:AWGN:BWIDth:NOISe on page 571
Display Mode - AWGN
Sets the display mode to Baseband or RF.
SCPI command:
[:SOURce<hw>]:AWGN:DISP:MODE on page 572
Display Output Results For - AWGN
(Additive Noise and Noise Only)
Impairment of Digital I/Q Signal and Noise Generator - AWGN/IMP Block
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