Rohde & Schwarz R&S SMW200A - Page 445

Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
445User Manual 1175.6632.02 ─ 30
[:SOURce]:BB:IMPairment:IQOutput<ch>:LEAKage:Q on page 1100
[:SOURce]:BB:IMPairment:RF<ch>:LEAKage:I on page 1101
[:SOURce]:BB:IMPairment:RF<ch>:LEAKage:Q on page 1101
Gain Imbalance
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 |)
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.
For more information, see:
●
Chapter 6.4.2.1, "Gain and Gain Imbalance", on page 440
●
"To optimize sideband suppression" on page 447
Remote command:
For analog impairments: [:SOURce<hw>]:IQ:IMPairment:IQRatio[:
MAGNitude] on page 1100
For digital impairments:
[:SOURce]:BB:IMPairment:BBMM<ch>:IQRatio[:MAGNitude] on page 1100
[:SOURce]:BB:IMPairment:FADer<ch>:IQRatio[:MAGNitude] on page 1100
[:SOURce]:BB:IMPairment:IQOutput<ch>:IQRatio[:MAGNitude]
on page 1100
[:SOURce]:BB:IMPairment:RF<ch>:IQRatio[:MAGNitude] on page 1100
Quadrature Offset
Sets the quadrature offset.
For more information, see:
●
Chapter 6.4.2.3, "Quadrature Offset", on page 442
●
"To optimize sideband suppression" on page 447
Remote command:
For analog impairments: [:SOURce<hw>]:IQ:IMPairment:QUADrature[:
ANGLe] on page 1101
For digital impairments:
[:SOURce]:BB:IMPairment:BBMM<ch>:QUADrature[:ANGLe] on page 1101
[:SOURce]:BB:IMPairment:FADer<ch>:QUADrature[:ANGLe] on page 1101
[:SOURce]:BB:IMPairment:IQOutput<ch>:QUADrature[:ANGLe]
on page 1101
[:SOURce]:BB:IMPairment:RF<ch>:QUADrature[:ANGLe] on page 1101
Skew
In the "I/Q Modulator or I/Q Analog > Digital Impairments" dialog, sets a delay between
the Q vector and the I vector of the corresponding stream.
If a R&S SGT is connected to one of the digital interfaces, digital impairments are
applied in the connected instrument.
See Figure 4-17.
Impairing the Signal