Configuring the Internal Baseband Source
R&S
®
SMW200A
348User Manual 1175.6632.02 ─ 16
To generate a multi-segment signal without signal interruptions
Testing receivers requires a continuous output of different test signals without interrupt-
ing the signal. The test signals then produce a complex total signal with no signal gaps
on switch over. Control procedures can use a simulated back channel of the receiver
(trigger line or remote control).
Switching times depend on the length of the segment currently being output, because
switch over to the next segment does not take place until the current segment comes
to an end.
To overcome wrap-around problems and generate multi-segment signal without signal
gaps between the segments, consider the following settings:
1. Enable "ARB > Trigger In (MSW) > Next Segment Trigger In > Next Segment
Mode = Next Segment Seamless"
2. Select "ARB > Trigger In (MSW) > Trigger Mode = Auto"
3. Select "ARB > Trigger In (MSW) > Trigger Source = Internal"
4. A segment ("Current Segment") is output continuously as long as the value of the
parameter "Segment" is not changed. Change the value of the parameter "ARB >
Trigger In (MSW) > Next Segment Trigger In > Segment" to select the segment
index to be processes after competing the current one.
5. The seamless transition between the segments requires waveforms with equal
clock rate.
If the waveforms feature different sample rates, select "ARB > Multi Segment >
Level/Clock/Marker > Clock Mode = Highest" or "Clock Mode = User" to resample
the waveforms.
To enable an external triggering for high-speed switch over
To test DUTs/chips using different test signals at high throughput requires fast switch
over (for instance when testing ATE devices during manufacture).
We assume, that the required multi-segment sequence is created and loaded in the
ARB (see "Generating a multi-segment waveform file (basic workflow)" on page 345).
The segments are output in incremental order. The instrument is operated manually,
the ARB generator is in active state, and the instrument output is switched on. An
external global or local trigger source is connected to the instrument and the corre-
sponding connectors are configured.
The following settings enable switching times of approx. 5 us and the test signals
are scrolled through with the aid of an external trigger signal:
1. Select "ARB > Trigger In (MSW) > Next Segment Trigger In > Next Segment Mode
= Next Segment".
2. Select "ARB > Trigger In (MSW) > Next Segment Trigger In > Next Segment
Source = Global Next Trigger 1".
Generating Multi-Segment Waveform Files
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