112 Agilent N5181A/82A MXG Signal Generators User’s Guide
Basic Digital Operation (Option 651/652/654)
Clipping a Waveform
Configuring Circular Clipping
Use this example to configure circular clipping and observe its affect on the peak- to- average power
ratio of a waveform. Circular clipping clips the composite I/Q data (I and Q data are clipped equally).
For more information about circular clipping, refer to “How Clipping Reduces Peak- to- Average Power”
on page 109.
CAUTION Clipping is non-reversible and cumulative. Save a copy of the waveform file before you
apply clipping.
Copy a Waveform File
1. Display the signal generator’s files: Press File > Catalog Type > More > Volatile Segments.
2. Highlight the waveform RAMP_TEST_WFM.
3. Press Copy File.
4. Name the copy (in this example, the name is MY_TEST_CIRC) and press Enter.
Apply Circular Clipping to the Copied Waveform File
1. Open the DUAL ARB Waveform Utilities menu: Press Mode > Dual ARB > More > More > Waveform
Utilities.
2. In the list of files, highlight the copied file (in this example, MY_TEST_CIRC).
3. Create the CCDF plot: Press Plot CCDF.
4. Observe the shape and position of
the waveform’s curve (the dark line
in the example at right).
5. Activate circular clipping: Press
Return > Clipping > Clipping Type until
|I+jQ| highlights.
6. Set circular clipping to 80%:
Press Clip |I+jQ| To > 80 > %.
7. Apply 80% clipping to the I and Q
data: Press Apply to Waveform.
8. Create the CCDF plot (see the
example at right): Press Plot CCDF.
9. Observe the waveform’s curve after
clipping.
Note the reduction in
peak- to- average power relative to the
previous plot.
Example waveform curve before clippin
Example waveform curve after circular clippin
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