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178 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide
Basic Digital Operation (Option 651/652/654) Preliminary
Clipping a Waveform Preliminary
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 175.
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 > 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 clipping
Example waveform curve after circular clipping