R&S SMU200A Test Procedures
1007.9845.82 1.47
E-12
Measurement of quadrature error
Test assembly
See section "
Test Assembly for I/Q Modulation", page 1.4.
Measurement Settings on DUT:
RF
On
Frequency 900 MHz
Level 0 dBm
I/Q Settings menu:
Source Analog Wideband I/Q Input
State On
Impairment State off
Quadrature Offset 10 deg
Generate a modulation signal using the controller and the simulati
on
pr
ogram:
- Modulation 16QAM
- No coding
- SQR filter with = 0.5
- PRBS-9 data sequence
- Pulse width and oversampling 32
- Length 100 symbols
- Symbol clock 10 kHz
Make the corresponding settings on the demodulator. Synchroniz
e to
a bit sequence, starting with the 9th symbol, 12 bits long, result length
80 symbols. Caution: the mapping of DUT and demodulator must
be in agreement!
Select the vector representation on the demodulator.
The symbols should be located in a square grid.
Select Impairments State On on the DUT.
The symbols must no longer be arranged at right angles; the Y axis
should be inclined towards the left by 10°, with a setting of -10° it
should be inclined towards the right.
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