Good choice Bert Kehren
Sent from my Galaxy Tab® A -------- Original message --------From: Gerhard Hoffmann <[email protected]> Date: 9/16/18 6:30 PM (GMT-05:00) To: [email protected] 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 <[email protected]> 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 _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
