Rohde & Schwarz SMBV100A, Operating Manual

Page: 321 / 911

Instrument Function
R&S
®
SMBV100A
306 Operating Manual 1176.8016.02 ─ 17
I/Q impairment is activated and set in the "I/Q Impairments" section.
"Internal compensation" of signal distortions of the RF output can be activated / deacti-
vated.
I/Q Impairments
In the "I/Q Impairments" section the parameters for carrier leakage, imbalance and
quadrature offset can be set and I/Q impairment is activated.
State - Digital Impairments
Activates/deactivates digital I/Q impairment.
When activated, the settings for carrier leakage, I/Q imbalance and quadrature offset
become effective.
Internal predistortion for compensating the I/Q modulator is not influenced by this set-
ting.
Remote command:
[:SOURce<hw>]:BB:IMPairment:STATe
on page 692
I/Q Offset - Digital Impairments
Sets the carrier leakage (in percent) of the amplitudes (scaled to the peak envelope
power (PEP)) for the I and/or Q signal component. An ideal I/Q modulator suppresses
the carrier leakage completely (offset = 0 percent).
For more information, see Chapter 5.7.1.2, "I and Q Offset" , on page 304.
Remote command:
[:SOURce<hw>]:BB:IMPairment:LEAKage:I
on page 690
[:SOURce<hw>]:BB:IMPairment:LEAKage:Q
on page 690
Gain Imbalance - Digital Impairments
Sets the imbalance of the I and Q vector (see Chapter 5.7.1.1, "Gain and Gain Imbal-
ance" , on page 303).
The entry is made in dB (default) or %, where 1 dB offset is roughly 12 % according to
the following:
Impairment of Digital I/Q Signal and Noise Generator - AWGN/IMP Block