Instrument Function
R&S
®
SMBV100A
307Operating Manual 1176.8016.02 ─ 17
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>]:BB:IMPairment:IQRatio[:MAGNitude] on page 690
Quadrature Offset - Digital Impairments
Sets the quadrature offset (see Chapter 5.7.1.3, "Quadrature Offset", on page 305).
Remote command:
[:SOURce<hw>]:BB:IMPairment:QUADrature[:ANGLe] on page 691
I/Q Skew - Digital Impairments
Sets the time offset between the I and Q vectors.
In an I/Q modulator without I/Q skew, the I and Q vectors are aligned to the marker.
With an I/Q skew, both vectors are shifted relative to the marker so that the offset of
each of the vectors to the marker will be the half of the I/Q skew value.
A positive I/Q skew means that the Q vector delays relative to the I vector and vice
versa.
Remote command:
[:SOURce<hw>]:BB:IMPairment:SKEW on page 691
IQ Delay
Sets the time delay of both I and Q vectors relative to the selected trigger and marker
or relative to the other instrument(s) working in the master-slave synchronous mode
(see Chapter 5.9.2.4, "Synchronous Signal Generation", on page 329).
A positive value means that the I and Q vectors delay relative to the marker/trigger or
to the other instrument and vice versa.
Remote command:
[:SOURce<hw>]:BB:IMPairment:DELay on page 689
Internal Compensation
Internal compensation of signal distortions of the RF output can be activated / deacti-
vated.
Optimize internal IQ-Impairments for RF Output - Digital Impairments
Activates or deactivates internal compensation of signal distortions of the RF output.
Signal distortions can be either optimized for the RF output (active) or for the differen-
tial I/Q output (not active).
Remote command:
[:SOURce<hw>]:BB:IMPairment:OPTimization:STATe on page 692
Optimization Mode - Digital Impairments
Selects the optimization mode of the internal equalization which flattens out the fre-
quency response from the instrument automatically.
Impairment of Digital I/Q Signal and Noise Generator - AWGN/IMP Block
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