Rohde & Schwarz SMU200A - Page 744

Remote Control Commands
R&S
®
SMU200A
724Operating Manual 1007.9845.32 ─ 15
[:SOURce<hw>]:IQ:GAIN <Gain>
This command specifies the baseband gain for the external analog wideband I/Q signal.
Thus, the modulation of the I/Q modulator can be optimized for any measurement
requirement. The gain settings for an internal or external baseband signal are performed
with command SOUR:BB:IQGain.
Parameters:
DBM3|DB0|DB3|DB6
DBM3
Activates -3 dB gain.
With this setting, signal distortions are minimized.
DB0
Activates 0 dB gain (standard settings).
DB3
Activates 3 dB gain.
This setting is recommended for 3GPP signals with very high
adjacent channel power ratio (ACPR).
DB6
Activates 6 dB gain.
Activates 0 dB gain.
With this setting, signal noise is minimized.
0.01dB
External Wideband: 3 dB
<Gain>
Increment:
*RST:
IQ:SOUR ANAL
selects an external analog signal as the input signal for the I/Q
modulator. The signal must be applied at the inputs I and Q.
IQ:GAIN DB0
sets gain 0 dB (standard).
Example:
Example:
[:SOURce<hw>]:IQ:IMPairment:IQRatio[:MAGNitude] <Magnitude>
This command sets the ratio of I modulation to Q modulation (amplification “imbalance”).
Parameters:
float
-1.0dB to +1.0dB
0.005dB
0
0dB
<Magnitude>
Range:
Increment:
*RST:
Default unit:
IQ:IMP:IQR 0.5 dB
sets the imbalance.
Example:
[:SOURce<hw>]:IQ:IMPairment:LEAKage:I <I>
This command sets the carrier offset for the I-channel of the I/Q modulation.
SOURce Subsystem