Instrument Function
R&S
®
SMBV100A
453Operating Manual 1176.8016.02 ─ 17
The R&S SMBV can process digital signals with sample rate from 400 Hz to 100
MHz, where as the internal signal processing is based on a sample rate with 200
MHz.
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Estimating or defining the sample rate
The sample rate of the signal at the digital interface can be determined with one of
the following methods:
– User-defined sample rate
Provide both the external signal source and the receiving instrument with a
common external reference signal and set the sample rate value.
– Estimated sample rate
Enable the instrument to evaluate the received I/Q data clock
Maximum modulation bandwidth
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A baseband signal with a sample rate that is smaller than the used system clock is
interpolated (see Figure 5-30). With R&S SMBV-B10, the resulting modulation
bandwidth is calculated as Sample Rate * 0.62, i.e. with a sample rate of exactly
100 MHz, the modulation bandwidth is 62 MHz.
5.10.2 BB Input Block
The settings for frequency and phase offset are available in the "BB In/Out" function
block or in the "BB In/Out" menu which is opened using the MENU key.
The external baseband signal is activated by switching on in the "Baseband Input" set-
tings menu as well as by ticking the checkbox of the "BB In/Out" function block.
Select "Baseband Input Settings" in the menu to open the "Baseband Input Settings"
dialog (see Chapter 5.10.2.1, "Baseband Input Settings Menu", on page 453). The
menu additioanlly provides access to the "Baseband Output Settings" dialog (see
Chapter 5.8, "Digital I/Q Output Settings", on page 320) and the entry of frequency and
phase offset.
5.10.2.1 Baseband Input Settings Menu
The settings for the external baseband signal are available in the "BB In/Out" function
block or in the "BB In/Out" menu which is opened using the MENU key.
External Baseband Signal - Baseband Input
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