Configuring the Signal in the RF Domain
R&S
®
SMW200A
496User Manual 1175.6632.02 ─ 16
7.7.2.1 Internal Signal Sources
Fully equipped, the R&S SMW provides the following internal modulation sources:
●
LF Generator
Supplies sinusoidal and square waves in the frequency range 0.1 Hz ... 1 MHz and
selectable shapes.
To obtain a triangle, trapezoid or square wave, a pulse signal, the R&S SMW con-
verts the sinusoidal signal internally to the respective shape.
●
Multifunction generator
A further LF generator for use as a second modulation source. It features an exten-
ded frequency range of 0.1 Hz ... 10 MHz and selectable signal shapes. Alterna-
tively, you can use it to generate a noise modulation signal.
●
Noise generator
Supplies white noise with selectable bandwidth and level distribution.
●
High performance pulse generator
Allows you to generate either single or double pulse signals.
7.7.2.2 External Signal Sources
For the input of an external amplitude, frequency or phase modulation signal, you can
assign the signal at the EXT X connectors.
External pulse modulation signals are fed via the global connectors, assigned in the
"Global Connector Settings" dialog, see Chapter 11.2.5, "Global Connectors Settings",
on page 669.
The external modulation signal at the input must have a voltage of U
S
= 1 V (U
EFF
=
0.707 V, in case of sine signals) to achieve the displayed modulation depth and range.
The input voltage should not exceed 1.1 V, otherwise modulation distortions might
occur. With external pulse modulation, the switching point is max. 2.4 V and the volt-
age at the input should not exceed 5 V. The maximum modulation frequency is 10 MHz
for frequency and phase modulation.
7.7.2.3 Assigning the LF Signal to the Output
The R&S SMW can also act as the source for modulations in downstream equipment.
Regardless of the used signal source, which can be the internally generated or an
externally fed LF modulation signal, you can optionally select the signal for output. The
LF signal is output at the LF OUT x connectors.
Note that the output of the internal LF signal and the analog I/Q signal use the same
physical connectors (LF OUT X and I/Q OUT X), that means these signals cannot be
output simultaneously. If both, the I/Q and the LF signal output are switched on, the I/Q
signal is suppressed and the instrument provides the LF signal.
Analog Modulations
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