Configuring the Internal Baseband Source
R&S
®
SMBV100B
148User Manual 1178.4460.02 ─ 03
In general the I/Q samples are located on a deformed circle which is confined to
the dashed square in the upper diagrams.
●
Rect Test Signal: Rectangle signal with selectable but equal On and Off periods
and amplitude. The period is defined by the selected frequency: <Period> = 1 /
"Frequency".
The signal is mapped on both the I and Q samples. This results in two distinct
points in the I/Q plane. The "Offset DC" shifts both points along the diagonal I(t) =
Q(t).
●
Const I/Q Test Signal: Continuous test signal with constant IQ and constant Clock
Frequency of 10 KHz. The values for each I and Q components are selectable but
constant. They are defined as a decimal number, which is decimal-to-binary con-
verted internally. The signal is provided as a 16-bit wide digital signal for both I and
Q channels.
Converted to analog, the signal is output directly at the BNC connectors I and Q
outputs of the instrument.
3.6.2.3 Waveform Sample Rate
The Arbitrary Waveform Generator includes a resampling unit that interpolates the
input samples to reach a target digital output I/Q sample rate before digital-to-analog
conversion (DAC). The input sample rate f
input
is retrieved from the waveform (the
default sample rate tag) or is defined by the corresponding parameter in the ARB user
interface.
The Figure 3-12 depicts the stages involved in the processing and resampling of a
waveform in the ARB.
Figure 3-12: Processing of the waveform files in the ARB
Using the Arbitrary Waveform Generator (ARB)
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