R&S SMU200A Test Procedures
1007.9845.82 1.63
E-12
Aliasing Filter – D/A Converter, Interpolation Spectra
Note:
Make sure that the measured spurious signal does not come from the analyzer. The following tests
can be performed for this purpose:
-
Switch off the signal from the DUT and repeat the measurement; if the signal remains, it may come from
the analyzer.
- Output the signal from the DUT with a slight frequency offset; if the signal remains, it may come from the
analyzer.
Test equipment Signal analyzer R&S FSQ (table 1-1, pos. 24).
Test setup
Connect the signal analyzer to the RF output of the DUT
.
S
ynchronize the reference frequencies of the DUT and the analyzer.
Test method
Multicarrier CW with two carriers. The carrier spacing is double the test
frequency, and the frequency is varied. The level measured at the
measurement frequency gives the value for the suppression of the
interpolation.
Measurement
Settings on DUT
RF On
Frequency: 1 GHz
Level: 0 dBm
Multi Carrier CW: State ON
Number of Carriers: 2
Carrier Spacing: 2 x test frequency
Carrier 0 State: On
Carrier 1 State: On Power Step: 0 dB
Settings on analyzer:
FREQ CENTER: measurement frequency
SPAN 0 Hz
AMPT / REF LEVEL - 10 dBm
BW / RES BW MANUAL 30 kHz
BW / SWEEP TIME MANUAL 200 ms
TRACE / DETECTOR RMS
MKR / MARKER 1
Test frequencies: Measurement frequencies:
9.9 MHz 949.5 MHz
9.9 MHz 1050.5 MHz
20.1 MHz 960.3 MHz
20.1 MHz 1039.7 MHz
39.9 MHz 939.9 MHz
39.9 MHz 1060.1 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: D/A converter interpolation spectra
Number of measurements
1 x 2 x 2 x 1 x
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