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110 Chapter 3
Basic Digital Operation
Using Waveform Clipping
Figure 3-11 Combining the I and Q Waveforms
How Peaks Cause Spectral Regrowth
Because of the relative infrequency of high power peaks, a waveform will have a high peak-to-average
power ratio (see Figure 3-12). Because a transmitter’s power amplifier gain is set to provide a
specific average power, high peaks can cause the power amplifier to move toward saturation. This
causes intermodulation distortion, which generates spectral regrowth.