Signal Generator Settings
R&S
®
SGS100A
122User Manual 1173.9105.02 ─ 12
7.8.3 Analog Impairment Settings
► To access the settings of the I/Q modulator, select "SGMA-GUI > Instrument Name
> I/Q Settings > Analog Impairments".
Comprises the settings like I/Q offset and quadrature offset.
State
Activates/deactivates I/Q impairments.
If activated, the settings for offset, gain imbalance and quadrature offset become effec-
tive.
It is indicated in the function block, if the I/Q impairment is activated.
Remote command:
[:SOURce]:IQ:IMPairment[:STATe] on page 247
Offset
Sets the carrier offset (in percent) of the amplitudes (scaled to the peak envelope
power (PEP) for the I and/or Q signal component. An ideal I/Q modulator suppresses
the carrier offset completely (offset = 0 percent).
For more information, see Chapter 7.8.1.2, "I and Q Offset", on page 120.
Remote command:
[:SOURce]:IQ:IMPairment:LEAKage:I on page 246
[:SOURce]:IQ:IMPairment:LEAKage:Q on page 246
Gain Imbalance
Sets the imbalance of the I and Q vector (see Chapter 7.8.1.1, "Gain and Gain Imbal-
ance", on page 119).
The entry is made in dB (default) or %, where 1 dB offset is roughly 12 % according to
the following:
Imbalance [dB] = 20log ( | GainQ | / | GainI |)
Positive values mean that the Q vector is amplified more than the I vector by the corre-
sponding percentage. Negative values have the opposite effect.
I/Q Modulation and Signal Impairment
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