Signal Generator Settings
R&S
®
SGT100A
137
User Manual 1176.8674.02 ─ 07
Figure 7-8: Definition of I/Q modulator in IS2000 and R&S
SGT
According to IS2000, the RF signal s(t) is derived from the baseband I/Q signal as fol-
lows:
s(t)=i(t)cos(2pif
c
t)
+
q(t)sin(2pif
c
t)
The instrument family is based on the following definition:
s(t)=i(t)cos(2pif
c
t)
-
q(t)sin(2pif
c
t)
"I/Q Swap" must now be set to "On" so that an I/Q modulator defined according to
IS2000 can cope with the RF signal generated by the R&S
SGT.
"Off"
I/Q control is normal.
"On"
The I and Q signals are swapped.
Remote command:
[:SOURce]:IQ:IMPairment:SWAP[:STATe]
I/Q Wideband
Optimized setting for wideband modulation signals (>5 MHz).
The modulation frequency response is decreased at the expense of poorer harmonic
suppression. This is achieved by shifting the switching frequencies of the lowpass fil-
ters in the output section.
Remote command:
Optimization Mode
Available only for "Source > Internal Baseband".
Selects the optimization mode.
"Fast"
Fast optimization by compensation for I/Q skew.
Use this mode in time sensitive environments.
I/Q Modulation and Impairment Settings