Configuring the Signal in the RF Domain
R&S
®
SMW200A
494User Manual 1175.6632.02 ─ 16
●
Frequency
These parameters are modified in accordance with the low frequency signal to obtain
the modulated RF signal.
The R&S SMW provides all the various types of modulation, such as AM (Amplitude
Modulation), FM (Frequency Modulation), ΦM (Phase Modulation (PhiM)), and also
PULM (Pulse Modulation). The instrument generates the LF modulation signal as sine,
triangle, trapezoidal or square (pulse) waveform, that can be output for use in a down-
stream instrument, if required. You can also create various interference signals such
as white noise with selectable bandwidth and level distribution.
Furthermore, a monitor function allows you to synchronize the LF output signal with the
amplitude, frequency or phase modulation signal.
The instrument provides the following internal modulation signal sources:
●
An LF generator
●
A multifunction generator and a noise generator
●
A high performance pulse generator
The R&S SMW generates both the carrier (LF) and RF frequencies, provides sine or
square waves, waveforms with rising and falling edges (triangle, sawtooth and trape-
zoid), and various noise signals, such as a white noise with selectable bandwidth and
level distribution.
To configure and perform a modulation, you need to select the LF modulation signal
source, configure the LF signal, and determine the settings of the modulation.
See the following sections for detailed information:
●
Modulation Signals describes the characteristics of the available modulation signal
sources, and provides access to the RF Connectors Settings.
●
Modulation Signal Waveforms shows the waveform shapes and their respective
parameters graphically.
●
Modulation Settings contains the settings for the AM, FM, PhiM and Pulse modula-
tion.
●
LF Signal Output Settings enables you to select the signal for output, and to spec-
ify the amplitude and an offset.
Analog Modulations
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