134 Keysight E8357D/67D & E8663D PSG User’s Guide
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
). 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.
Figure 3-12
Peak–to–Average Power
