Emerson R&S SGT100A User Manual page 155

®
R&S SGT100A
In the final step, the filtered I/Q signal is modulated to the desired RF in a different way
in the I/Q modulator:
Figure 6-10: 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
The instrument family is based on the following definition:
s(t)=i(t)cos(2pif
Set "I/Q Swap > On" so that an I/Q modulator defined according to IS2000 can cope
with the RF signal generated by the R&S SGT.
"Off"
"On"
Remote command:
[:SOURce<hw>]:IQ:SWAP[:STATe]
[: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. The decrease is achieved by shifting the switching frequencies of the low-
pass filters in the output section.
Remote command:
[:SOURce]:IQ:WBSTate
Optimization Mode
Available only for "Source > Internal Baseband".
Selects the optimization mode.
"Fast"
User Manual 1176.8674.02 ─ 12
t)+q(t)sin(2pif t)
c c
t)-q(t)sin(2pif t)
c c
I/Q control is normal.
The I and Q signals are swapped.
on page 480
Fast optimization by compensation for I/Q skew.
Use this mode in time sensitive environments.
Signal generator settings
I/Q modulation and impairment settings
on page 480
on page 479
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