126 Chapter 3
Basic Digital Operation
Using Waveform Scaling
Figure 3-18 Waveform Overshoot
How Scaling Eliminates DAC Over–Range Errors
Scaling reduces or shrinks a baseband waveform’s amplitude while maintaining its basic shape and
characteristics, such as peak–to–average power ratio. If the fast–rising baseband waveform is scaled
enough to allow an adequate margin for the overshoot, the interpolator filter is then able to calculate
sample points that include the ripple effect, thereby eliminating the over–range error
(see Figure 3-19).
Figure 3-19 Waveform Scaling
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