[time-nuts] Programmable clock for BFO use....noise

[Attila Kinali]

On Sun, 16 Sep 2018 22:08:19 +0200
Gerhard Hoffmann <dk4xp at 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*.

			Attila Kinali

* That is, if you don't like Λ-dividers or DDS
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