[time-nuts] DDS'ery

Attila Kinali attila at kinali.ch
Mon Jun 20 17:05:54 UTC 2011

On Mon, 20 Jun 2011 16:39:16 +0100
Luis Cupido <cupido at mail.ua.pt> wrote:

> Well, if we really need to filter it out
> we better filter the MSB and square it
> again...
> Why having a DAC for ???
> Right ?

If you filter a square wave, you have a lot more harmonics than
if you filter a signal that is already nearly sine. Hence the
DAC stage gives you a higher signal purity. And as filters are
never optimal, you'd rather go with a more pure signal :-)

			Attila Kinali

Why does it take years to find the answers to
the questions one should have asked long ago?

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