Analog Modulations
R&S
®
SMA100B
74User Manual 1178.3834.02 ─ 05
– High-performance pulse generator
Generates single and double pulse, or pulse train signals.
●
External modulation source
– Amplitude, frequency or phase modulation signals are input at the Ext connec-
tor.
– Pulse modulation signals, at the Pulse Ext connector.
Signal output
You can perform AM, FM and PhiM with the signal of any of the provided sources.
Moreover, you can combine two modulation signals and generate a two-tone signal.
Regardless of the signal source, the generated signal can be output for further pro-
cessing in a downstream instrument.
Current configuration is indicated in the "Analog Modulations > Overview" dialog; the
output signal routing can be changed, too.
Input and output connectors
Direction Modulation Connector Required option
Output Pulse modulation from internal signal
Loop through of pulse signal from Pulse Ext
Pulse Video R&S SMAB-K22/-K23
All analog modulations
Marks the valid level and frequency
Signal Valid
Pulse generator Pulse Sync
LF generator LF
Input AM, FM, PhiM
Ext
**)
R&S SMAB-K720
Pulse modulation from external source
*)
Or
External trigger or gate signal
*)
Pulse Ext
**)
R&S SMAB-K22
●
*)
External trigger signal and external signal for the pulse modulation cannot be
used simultaneously, because these signals are expected at the same connector
Pulse Ext. Signal polarity and impedance are the same for both signals.
●
**)
The external modulation signal must have a voltage of US = 1 V (UEFF = 0.707
V) to achieve the displayed modulation depth and range.
Note that the input voltage does not exceed 1 V, otherwise modulation distortions
can occur.
For more information, see data sheet.
Interactions and characteristics
●
FM and PhiM modulations exclude each other and cannot be performed simultane-
ously.
●
In sweep mode, LF frequency sweep is possible.
Modulation Types and Signal Sources
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