Keysight Technologies N5171B EXG, User Manual

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Keysight EXG and MXG X-Series Signal Generators User’s Guide 233
Basic Digital Operation (Option 653/655/656/657)
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 230 .
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.
Clipping is non–reversible and cumulative. Save a copy of the waveform
file before you apply clipping.
Example waveform curve before clipping
Example waveform curve after circular clipping