Chapter 4 163
Basic Digital Operation
Using Waveform Scaling
is unable to replicate the true form of the ripple (see Figure 4-25). As a result, the ESG reports a DAC
over-range error.
Figure 4-25 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 4-26).
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