Signal Generator Settings
R&S
®
SGT100A
136
User Manual 1176.8674.02 ─ 07
If "Internal Baseband I/Q In" is selected, the I/Q modulator is always activated automat-
ically as soon as signal generation is activated in the "Baseband" block. It can, how-
ever, be deactivated later.
The following functions have the same effect:
●
The
icon in the SGMA-GUI.
●
The "I/Q Mod > On/Off" in the
block in the block diagram.
●
Remote command:
IQ Source
Selects the input signal for the I/Q modulator.
"Analog Wide-
band I/Q In"
Selects an external analog signal as the input signal. The signal must
be applied at the inputs I and Q.
"Internal Base-
band I/Q In"
Selects the internal baseband signal as the input signal. This setting
requires the additional equipment options for generating the various
baseband signals.
Remote command:
I/Q Swap
Available only for "Source > Internal Baseband".
Selects normal or swapped I/Q control. The modulation sidebands are inverted by
swapping the I and Q signals.
This parameter enables I/Q modulation to be performed on signals according to
IS2000 (cdma2000 standard) and the majority of all other standards. As a result, an I/Q
demodulator defined according to IS2000 can also be used for demodulating the gen-
erated signals.
The I/Q modulator defined in the IS2000 standard differs from the definition in the
R&S
SGT. The definition on which the R&S
SGT is based is used by virtually all digital
communication standards (except IS95 and IS2000).
In the final step, the filtered I/Q signal is modulated to the desired RF in a different way
in the I/Q modulator:
I/Q Modulation and Impairment Settings
