Rohde & Schwarz SMBV100B - Page 275

Adding Noise and Predistortions, and Impairing the Signal
R&S
®
SMBV100B
273User Manual 1178.4460.02 ─ 03
The instrument can also simulate the effect of non-linear effects like AM/AM and
AM/PM conversion.
See user manual R&S
®
SMBVB-K540, R&S
®
SMBVB-K541 Envelope Tracking and
AM/AM, AM/PM Predistortion.
Settings:
State............................................................................................................................273
I/Q Offset.....................................................................................................................273
Gain Imbalance...........................................................................................................273
Quadrature Offset........................................................................................................274
Skew........................................................................................................................... 274
IQ Delay...................................................................................................................... 274
Phase Offset................................................................................................................274
State
Activates the impairment of the I/Q signal.
If activated, the settings for I/Q offset, I/Q imbalance, and quadrature offset become
effective.
Remote command:
For analog impairments: [:SOURce<hw>]:IQ:IMPairment[:STATe] on page 806
For digital impairments:
[:SOURce]:BB:IMPairment:RF<ch>:STATe on page 806
[:SOURce]:BB:IMPairment:IQOutput<ch>:STATe on page 806
I/Q Offset
Sets a carrier offset (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 car-
rier offset completely (offset = 0 percent).
For more information, see:
●
Chapter 4.2.2.2, "I and Q Offset", on page 270
●
"To optimize the carrier leakage suppression" on page 275
Remote command:
For analog impairments:
[:SOURce<hw>]:IQ:IMPairment:LEAKage:I on page 804
[:SOURce<hw>]:IQ:IMPairment:LEAKage:Q on page 804
For digital impairments:
[:SOURce]:BB:IMPairment:IQOutput<ch>:LEAKage:I on page 804
[:SOURce]:BB:IMPairment:IQOutput<ch>:LEAKage:Q on page 804
[:SOURce]:BB:IMPairment:RF<ch>:LEAKage:I on page 804
[:SOURce]:BB:IMPairment:RF<ch>:LEAKage:Q on page 804
Gain Imbalance
Sets the imbalance of the I and Q vector.
The entry is made in dB (default) or %, where 1 dB offset is roughly 12% according to
the following:
Imbalance [dB] = 20log ( | GainQ | / | GainI |)
Impairing the Signal