N5161A/62A/81A/82A/83A MXG Signal Generators User's Guide

Basic Digital Operation (Option 651/652/654)Clipping a WaveformConfiguring Circular ClippingUse this example to configure circular clipping and observe its affect on the peak–to–average powerratio 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–AveragePower” on page 183.CAUTIONClipping is non–reversible and cumulative. Save a copy of the waveform file before youapply clipping.Copy a Waveform File1. 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 File1. 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 ofthe waveform’s curve (the dark linein the example at right).5. Activate circular clipping: PressReturn > 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 Qdata: Press Apply to Waveform.8. Create the CCDF plot (see theexample at right): Press Plot CCDF.9. Observe the waveform’s curve afterclipping.Note the reduction inpeak–to–average power relative to theprevious plot.Example waveform curve before clippingExample waveform curve after circular clipping186 Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide