| Summary: | 碩士 === 國立交通大學 === 電子研究所 === 83 === In many applications of electronic engineering, an extreme pure
sine wave is always needed as a signal source. And the look-up
table Direct Digital Frequency Synthesizer(DDFS) is the most
famous structure for generating this extreme pure sine wave.
But in conventional DDFS, via D/A Converter, the output signal
is reconstructed to a continous sine wave in stepping way. If
we use a slopping way instead of stepping way to reconstruct
the sine wave, this sine wave must be more smooth. That is to
say, the harmonics of the reconstructed sine wave would be
reduced a lot. In this thesis, a new method that based on the
conventional DDFS which would be arisen to produce a sine wave
in slopping way.
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