Instrument Function
R&S
®
SMU200A
276Operating Manual 1007.9845.32 ─ 15
Either the external analog signal (Path A only) or the externally or internally generated
baseband signal (Path A and B) is fed into the I/Q modulator ("I/Q Mod A/B" function
block).
Path A
I/Q modulation with an external analog I/Q signal is possible for the basic unit (R&S SMU
with frequency option R&S SMU-B10x) without additional equipment options.
The basic equipment configuration for generating an internal baseband signal includes
the options R&S SMU-B13 (Baseband Main Module) and R&S SMU-B9/B10/B11 (Unicod
and ARB).
Externally generated realtime baseband signals can be fed into the digital signal path via
the digital interface (digital signals) or the analog inputs (analog signals) (Option R&S
SMU-B17, Baseband Input).
Path B
External signals cannot be fed into the I/Q modulator. The second I/Q modulator is avail-
able if the option R&S SMU-B20x (Path B), a second R&S SMU-B13 option (Baseband
Main Module), and one of the options R&S SMU-B9/B10/B11 (Baseband Generator),
R&S SMU-B17 (External Baseband Input) or R&S SMU-K62 (Noise Generator) are
installed.
The external signal is input via the I and Q connector and transferred directly to the I/Q
modulator of Path A (I/Q Mod function block).
The internally generated baseband signal is configured in the Baseband function block
(see chapter 5.8, "Baseband Signal - Baseband Block", on page 321). Before the signal
is fed into the I/Q modulator, noise can be added and/or the signal can be impaired.
Impairment at this point along the signal flow is offered to allow a signal to be output at
the I/Q-OUT outputs (a signal which, for example, compensates signal distortion in a
connected test object (DUT)).
Prior to impairing and noise adding, the signal can also be faded in he Fading function
block.
Impairment is integrated in the basic unit. The generation of noise requires the option
R&S SMU-K62 (AWGN).
In the case of two-path instruments, the baseband signals of both paths can be added
with or without frequency offset.
Impairments can also be set in the I/Q Mod menu to allow an externally applied analog
I/Q signal to be impaired. An internal baseband signal can thus be impaired both digital
I/Q Modulation - I/Q Mod Block
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