Basic Digital Operation

Using Waveform Clipping

5.Generate the waveform sequence: Press Return > Return > ARB Off On to On.

6.Trigger the first waveform segment to begin playing repeatedly: Press the Trigger hardkey.

7.(Optional) Monitor the current waveform:

Connect the output of the signal generator to the input of an oscilloscope, and configure the oscilloscope so that you can see the output of the signal generator.

8.Trigger the second segment: Press the Trigger hardkey.

The second segment in the sequence now plays. Pressing the Trigger hardkey causes the current playback to finish and the next segment to start; when the last segment plays, pressing the Trigger hardkey causes the first segment in the waveform sequence to start when the current segment finishes.

Using Waveform Clipping

Waveforms with high power peaks can cause intermodulation distortion, which generates spectral regrowth (a condition that interferes with signals in adjacent frequency bands). The clipping function enables you to reduce high power peaks by clipping the I and Q data to a selected percentage of its highest peak.

The clipping feature is available only with the Dual ARB mode.

How Power Peaks Develop

To understand how clipping reduces high power peaks, it is important to know how the peaks develop as the signal is constructed.

I/Q waveforms can be the summation of multiple channels (see Figure 3- 10). Whenever most or all of the individual channel waveforms simultaneously contain a bit in the same state (high or low), an unusually high power peak (negative or positive) occurs in the summed waveform. This does not happen frequently because the high and low states of the bits on these channel waveforms are random, which causes a cancelling effect.

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Chapter 3

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Agilent Technologies E8267D PSG, E8257D PSG manual Using Waveform Clipping, How Power Peaks Develop
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E8267D PSG, E8257D PSG specifications

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