Test Procedures R&S SMU200A
1007.9845.82 1.58
E-12
Internal Baseband Generator
Modulated RF Frequency Response over the Complete Unit
The equipment layout for generating multicarrier signals includes the options R&S B13 (baseband main
module), R&S B10 (baseband generator) and R&S K61 (multicarrier CW).
(also see section “
RF Frequency Response due to Modulation“)
Test equipment Signal analyzer R&S FSQ (table 1-1, pos. 24)
Test setup
Connect the RF output of the DUT to the signal analyzer
.
Test method By applying a sinewave AC voltage by means of Multicarrier_CW, an
amplitude modulation with a suppressed carrier is generated. The
modulation frequency response is determined by measuring the sideband
power as a function of the frequency of the applied AC voltage. The
difference between the highest and lowest sideband level, found by
varying the modulation frequency, is the frequency response to be
measured.
Measurement Settings on DUT
RF On
Frequency: measurement frequencies
Level: 0 dBm Level: 0 dBm
Multi Carrier CW: State ON
Number of Carriers: 2
Carrier Spacing: 2 x test frequency
I/Q Mod: Wideband I/Q On
Settings on analyzer
FREQ CENTER measurement frequency +/- test frequency
AMPT/REF LEVEL 5 dBm,
SPAN 5 MHz
For all measurement frequencies with the specified carrier spacings
(= 2x test frequencies), measure the sideband level.
The modulation frequency response is the difference from the highest to
the lowest sideband.
Test frequencies: 1MHz (reference), 10MHz, 30MHz, 40MHz
Measurement frequencies:
850 MHz, 1750 MHz, 2200 MHz,
5000 MHz (with option R&S B106 only)
The number of necessary measurement depends on the number of installed RF- and baseband paths, see
following table:
Installed paths
1 X RF
1 X BB
2 X RF
2 X BB
2 X RF
1 X BB
1 X RF
2 X BB
RF frequency response due to modulation
Number of measurements
1 X 2 X 2 X 1 X
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