On 6/20/11 7:46 AM, Luis Cupido wrote:
Folks, a quick one...
A DDS, that is an accumulator with a DAC followed by a low pass filter
and comparator (zero crossing) to produce a square wave to drive a PLL
or a MIXER or else (at logic levels).
Isn't it the very same thing as just using the most significant bit of
the accumulator.
The zero crossing using just the MSB will have jitter, compared to
making a sign wave and then letting the zero crossing occur "between"
samples.
Depending on your application, MSB only might work well enough.
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