Configuring the RF signal
R&S
®
SMM100A
357
User Manual 1179.1341.02 ─ 05
7.11
Analog modulations
The R&S
SMM100A supports AM (amplitude modulation), FM (frequency modulation),
Φ
M (phase modulation (PhiM)), and also PULM (pulse modulation). It generates low
frequency signals (LF) as sine, triangle, trapezoidal or square (pulse) waveform, that
can be output and further processed by a downstream instrument.
Interactions and characteristics
●
Some modulations exclude each other and cannot be performed simultaneously.
●
For pulse modulated signals, you can select between fast or smoothed transitions,
see
This setting is available over the entire frequency range for all instruments with fre-
quency options up to 6
GHz. For higher frequency options, the frequency range for
the smoothed setting is limited.
For more information, see data sheet.
●
The settings of the modulation signal affect all analog modulations that use an
internal modulation source.
●
In sweep mode, LF frequency sweep is possible.
●
You can feed an external LF signal in each of the two paths.
●
An activated analog modulation automatically turns off:
–
I/Q modulation
–
Arbitrary waveform generation
–
Digital modulation
–
Digital standards
7.11.1
Required options
R&S
SMM100A base unit equipped with the following options:
●
Option pulse modulator (R&S
SMM-K22)
●
Option pulse generator (R&S
SMM-K23)
(supports generation of single and double pulse signals)
●
Option multi-function generator (R&S
SMM-K24)
●
Option AM/FM/PhiM, up to 6 GHz (R&S
SMM-K720)
●
Option frequency R&S
SMM-B1006
For more information, see data sheet.
7.11.2
Modulation signals
The signal sources for the modulation signal are two internal generators, LF and Noise,
and a pulse generator, but you can also use an externally supplied signal, see
Analog modulations
