Unlike an ADC which requires an FFT processor to evaluate spectral purity, a DAC produces an analog output which can be examined directly using a traditional analog spectrum analyzer. A challenge in DAC evaluation is generating the digital input that can range from a single-tone sinewave to a complex wideband CDMA signal. Direct digital synthesis techniques can be used to generate digital sinewaves, but more sophisticated and expensive word generators are needed to produce the more complex digitial signals.
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