Instrument Function
R&S
®
SMBV100A
300Operating Manual 1176.8016.02 ─ 17
5.6.2.2 Impairments
I/Q impairment for specific impairment of the I/Q modulation is set in the "Impairments"
section.
State - Impairments I/Q Mod
Activates/deactivates I/Q impairment.
If activated, the settings for leakage, I/Q imbalance and quadrature offset become
effective.
Whether or not I/Q impairment is activated is indicated in the function block.
Note: It is advisable to switch automatic level control to the Sample&Hold mode, as
otherwise level errors may occur (see Chapter 5.5.7, "Automatic Level Control - ALC",
on page 226).
Remote command:
[:SOURce<hw>]:IQ:IMPairment[:STATe] on page 748
Offset - I/Q Mod
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 5.7.1.2, "I and Q Offset", on page 304.
Remote command:
[:SOURce<hw>]:IQ:IMPairment:LEAKage:I on page 747
[:SOURce<hw>]:IQ:IMPairment:LEAKage:Q on page 747
Gain Imbalance - I/Q Mod
Sets the imbalance of the I and Q vector (see Chapter 5.7.1.1, "Gain and Gain Imbal-
ance", on page 303).
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.
Remote command:
[:SOURce<hw>]:IQ:IMPairment:IQRatio[:MAGNitude] on page 746
Quadrature Offset - I/Q Mod
Sets the quadrature offset (see Chapter 5.7.1.3, "Quadrature Offset", on page 305).
Remote command:
[:SOURce<hw>]:IQ:IMPairment:QUADrature[:ANGLe] on page 747
5.6.2.3 I/Q Swap and I/Q Wideband
The I/Q control can be swapped and the optimized setting for wideband signals can be
selected in the middle section of the menu.
I/Q Modulation - I/Q Mod Block
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