Rohde & Schwarz RTP Series - Analysis of Differential Signals; Deembedding of Differential Signals

Acquisition and waveform setup
R&S
®
RTP
206User Manual 1337.9952.02 ─ 12
5.8.3 Deembedding of differential signals
To remove the parasitic effects of the measurement setup from the measured signal,
you can use deembedding for differential signals. Deembedding requires option
R&S RTP-K121, and realtime deembedding requires option R&S RTP-K122 in addi-
tion.
The deembedding of differential signals is represented by one or more 4-port input
components. You can activate deskewing, and set a skew time.
See also: Chapter 19, "Deembedding (Option R&S RTP-K121/-K122)", on page 1061.
1. On the "Vertical" menu, select "Differential Signals".
2. Select the input channels of the positive and negative signal.
3. Enable the differential signal.
4. Select "Deembedding".
5. Select the channel subtab of the positive input.
6. On the "Setup" tab, enable deembedding for the channel.
7. Optionally, you can enable realtime deembedding if available.
8. On the "Input" component, select "Configure".
9. If necessary, activate "Use skew offset". Use the deskewing if the P and N wave-
forms are not correctly aligned.
When you disable a deembedded differential signal in "Vertical" > "Differential Signals",
deembedding is also disabled. When you enable the differential signal again, repeat
the deembedding and output settings.
5.8.4 Analysis of differential signals
Before analyzing the output waveforms of differential signals, make sure that the P and
N signals are correctly aligned. Without deembedding, use "Horizontal" > "Skew" to
deskew the input waveforms if necessary. For deembedded waveforms, the skew set-
ting is in the deembedding configuration.
For all output waveforms of differential signals (differential, common mode, P, N), the
usual analysis methods are available:
●
Trigger on differential, common mode, P, and N waveforms.
Without deembedding, and with software deembedding, all possible output wave-
forms are available as trigger source, even if they are not selected and not dis-
played. Therefore, the differential signal must be enabled ("Enable" = on).
With realtime deembedding, you can trigger only on the selected output waveform.
Realtime deembedding and triggering is fast. You trigger on the corrected wave-
form, and you see this corrected waveform.
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Zoom
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Cursor measurements
Differential signals