Instrument Function
R&S
®
SMU200A
295Operating Manual 1007.9845.32 ─ 15
Fig. 5-21: Effect of a negative gain imbalance
SCPI command:
[:SOURce<hw>]:BB:IMPairment:IQRatio on page 660
Quadrature Offset - Digital Impairments
Sets the quadrature offset.
An ideal I/Q modulator sets the phase angle to exactly 90 degrees. With a quadrature
offset, the phase angle between the I and Q vector deviates from the ideal 90 degrees,
the amplitudes of both components are of the same size. In the vector diagram, the
quadrature offset causes the coordinate system to shift.
A positive quadrature offset means a phase angle greater than 90 degrees:
Impairment of Digital I/Q Signal and Noise Generator - AWGN/IMP Block
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