Rohde & Schwarz SGU100A, User Manual, Page: 85 / 236

Upconverter Settings
R&S
®
SGU100A
83 User Manual 1176.7726.02 ─ 09
The maximum input voltage at the I/Q input is equated to the peak power and is used
as the "reference" for setting the level of the output signal. Since the signal does not
usually supply the peak power at a constant level but instead supplies lower average
power, the crest factor specifies how many dB have to be added internally so that the
correct output power is achieved.
Remote command:
[:SOURce]:IQ:CREStfactor
on page 172
7.3.3 Analog Impairment Settings
► To access the settings of the I/Q modulator, select "SGMA-GUI > Instrument Name
> I/Q Settings > Analog Impairments".
Comprises the settings like I/Q offset and quadrature offset.
State
Activates/deactivates I/Q impairments.
If activated, the settings for offset, gain imbalance and quadrature offset become effec-
tive.
Note: It is recommended to switch automatic level control to the "Off (Table)" mode, as
otherwise level errors may occur.
Remote command:
[:SOURce]:IQ:IMPairment:STATe
on page 172
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 7.3.1.2, "I and Q Offset" , on page 81.
I/Q Modulation and Signal Impairment