Analog modulations
R&S
®
SMB100B
69User Manual 1178.3711.02 ─ 08
– Noise generator
The noise generator supplies white noise with selectable bandwidth and distri-
bution.
– 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 Mod. Ext.
connector.
– Pulse modulation signals, at the Pulse Ext. connector.
– Stereo modulation signals, at the Stereo L/R and S/P Dif 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 SMBB-K22/-K23
All analog modulations
Marks the valid level and frequency
Signal Valid
LF generator LF
Input AM, FM, PhiM
Mod. Ext.
**)
R&S SMBB-K720
Stereo modulation from external source Stereo L/R R&S SMBB-B5
Pulse modulation from external source
*)
Or
External trigger or gate signal
*)
Pulse Ext.
**)
R&S SMBB-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.
Modulation types and signal sources
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