Rohde & Schwarz SMU200A - I;Q Modulator

Instrument Function
R&S
®
SMU200A
277Operating Manual 1007.9845.32 ─ 15
(in the Impairment block in the Impairment menu) and analog in the I/Q modulator. If
impairments are set in both menus, they superimpose each other in the signal.
5.6.1 I/Q Modulator
To select the input signal of the I/Q modulator and to open the "I/Q Settings" menu, select
"I/Q Mod > Configure".
The "I/Q Settings" menu containing the modulation settings is opened in the top section
(see chapter 5.6, "I/Q Modulation - I/Q Mod Block", on page 275).
Use the the "I/Q Mod In" section to select the input signal:
●
select "Analog Wideband I/Q In", if the external analog signal is fed into the I/Q mod-
ulator.
The maximum available RF bandwidth is described in the instruments specifications
(see data sheet).
●
select "Internal Baseband I/Q In", if the internally generated baseband signal is used.
The RF bandwidth is reduced (see data sheet).
●
select "Internal Baseband I/Q In", in case the external analog signal fed into the digital
signal path.
The RF bandwidth is reduced (see data sheet).
Alternatively, the input signal can be selected in the "I/Q Settings" menu (see chapter 5.6,
"I/Q Modulation - I/Q Mod Block", on page 275).
5.6.2 I/Q Settings
To open the menu for setting the I/Q modulation parameters, select "I/Q Mod > Configure
> I/Q Settings" or use the MENU key.
System error correction of the I/Q modulator permits precise and repeatable measure-
ments. The correction routine should be called in the case of temperature fluctuations of
several degrees. To call the routine, press the SETUP key and select "System > Internal
Adjustment " and execute the desired adjustment procedure.
It is not possible to activate an I/Q modulation with an external analog signal ("Analog
Wideband I/Q In") simultaneously with:
●
AM,
●
digital modulation,
●
digital standards,
●
fading,
●
external baseband input,
●
noise,
●
arbitrary waveform generation and
●
multi carrier CW
I/Q Modulation - I/Q Mod Block