Rohde & Schwarz SMW200A - Page 426

Simulating Fading, Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMW200A
411User Manual 1175.6632.02 ─ 16
Quadrature Offset....................................................................................................... 412
Skew........................................................................................................................... 412
IQ Delay...................................................................................................................... 412
State
Activates the impairment of the I/Q signal.
If activated, the settings for I/Q offset, I/Q imbalance, and quadrature offset become
effective.
Remote command:
For analog impairments: [:SOURce<hw>]:IQ:IMPairment[:STATe] on page 1014
For digital impairments:
[:SOURce]:BB:IMPairment:RF<ch>:STATe on page 1014
[:SOURce]:BB:IMPairment:IQOutput<ch>:STATe on page 1014
[:SOURce]:BB:IMPairment:FADer<ch>:STATe on page 1014
[:SOURce]:BB:IMPairment:BBMM<ch>:STATe on page 1014
I/Q Offset
Sets a 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 car-
rier offset completely (offset = 0 percent).
For more information, see:
●
Chapter 5.3.2.2, "I and Q Offset", on page 408
●
"To optimize the carrier leakage suppression" on page 413
Remote command:
For analog impairments:
[:SOURce<hw>]:IQ:IMPairment:LEAKage:I on page 1013
[:SOURce<hw>]:IQ:IMPairment:LEAKage:Q on page 1013
For digital impairments:
[:SOURce]:BB:IMPairment:BBMM<ch>:LEAKage:I on page 1013
[:SOURce]:BB:IMPairment:BBMM<ch>:LEAKage:Q on page 1013
[:SOURce]:BB:IMPairment:FADer<ch>:LEAKage:I on page 1013
[:SOURce]:BB:IMPairment:FADer<ch>:LEAKage:Q on page 1013
[:SOURce]:BB:IMPairment:IQOutput<ch>:LEAKage:I on page 1013
[:SOURce]:BB:IMPairment:IQOutput<ch>:LEAKage:Q on page 1013
[:SOURce]:BB:IMPairment:RF<ch>:LEAKage:I on page 1013
[:SOURce]:BB:IMPairment:RF<ch>:LEAKage:Q on page 1013
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 5.3.2.1, "Gain and Gain Imbalance", on page 407
●
"To optimize sideband suppression" on page 413
Impairing the Signal