Rohde & Schwarz SMU200A - Additive White Gaussian Noise (R&S K62)

Test Procedures R&S SMU200A
1007.9845.82 1.78
E-12
Additive White Gaussian Noise (R&S K62)
Test equipment Signal analyzer R&S FSQ (table 1-1, pos. 24)
Test setup
 Connect signal analyzer to RF output of DUT.
Test method A digital modulated signal is generated and noise is added. Using the
channel power measurement facility of the spectrum analyzer, the carrier
power and the power of a section of the noise spectrum is determined. By
expanding the result to the system bandwidth, the carrier to noise ratio
can be reconstructed.
The noise generator is a firmware option, realized in a FPGA. The
functionality of this FPGA is tested with one measurement, data are
guaranteed by design.
Measurement  Settings on DUT
Level: 0 dBm
Frequency: 1 GHz
RF: State ON
 Settings on DUT if Unicod is install
ed
B
aseband Custom Digital Modulation
Set to default (GSM), Symbol Rate 500 Hz
State on
AWGN/IMP AWGN
Additive Noise, System Bandwidth 1 MHz
Carrier/Noise Ratio 20.00 dB
State ON
 Settings on analyzer
FREQ CENTER: 1 GHz
MEAS CHAN PWR ACP
CP /ACP CONFIG CHANNEL BANDWIDTH 100 kHz
AMPT REF LEVEL 10 dBm
BW RES BW MANUAL 30 kHz
VIDEO BW MANUAL 300 kHz
TRACE DETECTOR RMS
SWEEP SWEEP TIME MANUAL 2 sec
 Measure carrier power and denote as a referenc
e.
 S
ettings on DUT if Unicod is not install
ed
AW
GN/IMP AWGN
Noise only, System Bandwidth 1 MHz
Noise Level -20.00 dB
State ON
 Now retune center frequency of the analyzer to 1.0003 GHz
.
 M
easure the noise power.
 Since the measurement bandwidth is a tenth of the system
bandwidth, the result is to be corrected by 10 dB.
 The result is carrier power – noise power – 10 dB
.