Configuring the Signal in the RF Domain
R&S
®
SMW200A
426User Manual 1175.6632.02 ─ 16
7 Configuring the Signal in the RF Domain
The vector signal generator R&S SMW generates RF signals with outstanding spectral
purity within the frequency range from 100 kHz up to 40 GHz and with adjustable sig-
nal level over a wide range.
Versatile analog modulation types enable you to generate the RF signal according to
your requirements, with definable characteristics. In addition to CW signals in real time,
you can generate also RF signals from predefined lists, characterized by fast changing
frequency and level settings and precisely definable signal properties, as well as
sweep signals that vary according to the frequency or amplitude curves.
The variably adjustable output level due to the built-in attenuator, allows you to vary
the RF signal level over the full level range, see Chapter 7.8.1, "Attenuator",
on page 521.
There are also various possibilities to improve signal performance to optimize the sig-
nal quality for the corresponding application, see Chapter 7.8, "Improving Level Per-
formance", on page 520. These include for example Chapter 7.8.3, "User Correction",
on page 529 or Chapter 7.8.2, "ALC - Automatic Level Control", on page 524, which
increase the accuracy and reliability of the generated RF signal.
In addition, the R&S SMW supports R&S NRP power sensors. You can search and
assign connected sensors, see Chapter 7.8.4.2, "NRP Sensor Mapping", on page 541,
and monitor the output level in the generator, see Chapter 7.8.4.3, "NRP Power
Viewer", on page 543. With the R&S NRP power sensors, you can also determine the
level correction values for user correction lists, see Chapter 7.8.3, "User Correction",
on page 529.
Signal modes and characteristics
The R&S SMW generates unmodulated, analog modulated or vector modulated RF
signals. You can output the signal either in fixed mode, or as a signal having periodi-
cally varying frequencies or amplitudes.
Signal modes for RF signal generation:
●
Unmodulated Signal
Generates an unmodulated continuous wave (CW) of constant frequency and
amplitude. In Configuring RF Frequency and Level you can find all information
regarding the signal frequency and level settings.
See also Chapter 2.3.1, "Generating an Unmodulated Carrier", on page 67 for an
example on how to configure a simple CW signal.
●
Analog modulated signal
Modulates the signal with an analog signal, as described in Chapter 7.7, "Analog
Modulations", on page 493.
The R&S SMW supports Amplitude, Phase, Frequency and Pulse Modulation. The
instrument is able to generate the corresponding modulation signal internally, but
you can also use an externally supplied signal.
●
Vector modulated signal
Generates an I/Q vector modulated signal, see Chapter 6, "Applying I/Q Vector
Modulation", on page 415.
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