[time-nuts] Programmable clock for BFO use....noise
ewkehren at AOL.com
Mon Sep 17 06:25:48 EDT 2018
Good choice Bert Kehren
Sent from my Galaxy Tab® A
-------- Original message --------From: Gerhard Hoffmann <dk4xp at arcor.de> Date: 9/16/18 6:30 PM (GMT-05:00) To: time-nuts at lists.febo.com Subject: Re: [time-nuts] Programmable clock for BFO use....noise
Am 16.09.2018 um 23:11 schrieb 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
>> 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.
time-nuts mailing list -- time-nuts at lists.febo.com
To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
and follow the instructions there.
More information about the time-nuts