Am 16.09.2018 um 23:11 schrieb Attila Kinali:
On Sun, 16 Sep 2018 22:08:19 +0200
Gerhard Hoffmann <dk...@arcor.de> wrote:
I'm also not a fan of using slowish, slew-rate challenged logic as a
replacement
for a low pass. When I want a low pass, I make it from nice,
time-invariant RLC.
Unfortunately, using a low pass after the divider will not
prevent the down-mixing. The down-mixing happens as an inherent
property of digital circuits. Any filtering you do afterwards
will be too late. If you want to have low noise, then the only
way is to produce a non-square wave signal. Or in other words:
use a divider built from harmonic mixers*.
Why do you assume that slew-rate limited mixers are any
better than mixers with an ultra-short analog time window
for doing mess?
We should sort that out offline, we are just 20 miles apart?
I propose the Zwickel pub in Dudweiler; I'm there with the
mostly emerited Fraunhofer people on Friday evenings
now & then. :-) :-) :-)
* That is, if you don't like Λ-dividers or DDS
I do like DDS, and I don't see a reason for the D/A converters
in front of the mixers. D/A converters remove the fun when you
can just instantiate a multiplier.
Cheers,
Gerhard
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