Digital Predistortion - Agilent Technologies N6030A Series User Manual

Digital Predistortion

The predistortion function compensates for the variation in the magnitude of
the output response as a function of frequency. This variation is the result of
the sin x/x (sinc) roll-off of the internal DAC and the frequency response of
the reconstruction filter. The correction method uses filters to level the
amplitude response and to create a linear phase response at the front panel of
the AWG. This precess attenuates the signal as a function of frequency, but
cannot increase the signal above the maximum output voltage. Therefore, it
is necessary to attenuate the lower frequency signals. This results in a
reduced output voltage and dynamic range at all frequencies, but with
uniform response across the full frequency range.
Chapter 3
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Theory of Operation
Theory of Operation
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