Test Procedures R&S SMU200A
1007.9845.82 1.60
E-12
IQ Output, Frequency Response and Imbalance
Important:
Before the measurement, Signal Analyzer R&S FSQ must be calibrated as follows by means of a reference
measurement at the measurement frequency in question:
3. Connect the RF output of the DUT to the power meter and measure the output level.
4. Include the measured level as a reference value/calibration value in the R&S FSQ.
Test equipment Signal analyzer R&S FSQ (table 1-1, pos. 24).
Test setup Connect the signal analyzer to the I/(and Q)-output of the DUT.
Test method
A single sideband signal is generated using the Multicarrier CW
functionality by selecting only one carrier. The offset is set with the
Frequency Offset function in the Baseband menu. The test frequencies
are set one after the other. 1 MHz is the reference. The imbalance is
obtained from the level differences between I and Q at a particular
frequency.
Measuremet Settings on DUT
Frequency: 100 MHz
Level: 0 dBm
Multi Carrier CW: State ON
Number of Carriers: 1
Frequency Offset: measurement frequency
Optimize internal I/Q Impairments for RF: OFF
Settings on analyzer
FREQ CENTER measurement frequencies
SPAN 0 Hz
AMPT/REF LEVEL – 10 dBm
BW /RES BW MANUAL 100 kHz
Measure the frequency response at the measurement frequencies in I
and Q and check the deviation.
Measurement frequencies: 1MHz (reference), 10 MHz, 30 MHz and
40 MHz.
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
I/Q output: frequency response and amplitude-equality
Number of measurements
1 x 2 x 2 x 2 x
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