Instrument Function
R&S
®
SMU200A
281Operating Manual 1007.9845.32 ─ 15
Fig. 5-11: Effect of an identical offset for both signal components
SCPI command:
[:SOURce<hw>]:IQ:IMPairment:LEAKage:I on page 724
[:SOURce<hw>]:IQ:IMPairment:LEAKage:Q on page 725
Gain Imbalance - I/Q Mod
Sets the imbalance of the I and Q vector.
The entry is made in dB (default) or %, where 1 dB offset is roughly 12 % according to
the following:
Imbalance [dB] = 20log ( | GainQ | / | GainI |)
An ideal I/Q modulator amplifies the I and Q signal path by exactly the same degree. The
imbalance corresponds to the difference in amplification of the I and Q channel and
therefore to the difference in amplitude of the signal components. In the vector diagram,
the length of the I vector changes relative to the length of the Q vector.
Positive values mean that the Q vector is amplified more than the I vector by the corre-
sponding percentage.
I/Q Modulation - I/Q Mod Block
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