R&S SGT100A, User Manual

Page: 170 / 593

Signal Generator Settings
R&S
®
SGT100A
139 User Manual 1176.8674.02 ─ 07
I/Q impairment for specific impairment of the I/Q modulation is set in the "Analog
Impairments" dialog.
State
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.
Remote command:
[:SOURce<hw>]:BB:IMPairment:STATe
on page 410
I/Q Offset
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 7.3.2.1, "I and Q Offset" , on page 133.
Remote command:
[:SOURce]:IQ:IMPairment:LEAKage:I
on page 423
[:SOURce]:IQ:IMPairment:LEAKage:Q
on page 423
Gain Imbalance
Sets the imbalance of the I and Q vector, see Chapter 7.3.2.2, "Gain and Gain Imbal-
ance" , on page 133.
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]:IQ:IMPairment:IQRatio[:MAGNitude]
on page 423
Quadrature Offset
Sets the quadrature offset, see Chapter 7.3.2.3, "Quadrature Offset" , on page 134.
Remote command:
[:SOURce]:IQ:IMPairment:QUADrature[:ANGLe]
on page 424
7.3.3.3 Digital Impairments
► To access this dialog, select:
a) "SGMA-GUI > Instrument Name > IQ Mod > Digital Impairments"
b) "SGMA-GUI > Instrument Name > Impairments > Digital Impairments"
I/Q Modulation and Impairment Settings