[time-nuts] fast switching quiet synthesizer

Tim Shoppa tshoppa at gmail.com
Wed Oct 8 10:50:58 EDT 2014


On Wed, Oct 8, 2014 at 3:52 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

>
> bruce at ko4bb.com said:
> > Kratos   (www.kratosepd.com) do fast switching synthesiser subsystems
> that
> > can be locked to a reference..
>
> What does "fast switching" mean in the context of a DDS?
>
> What does the spectrum of a DDS look like if I switch back and forth
> between
> 2 frequencies at 1 KHz?  Or what question should I be asking?
>

The bare AD DDS chips do textbook-perfect phase-continuous FSK quite
nicely. This is not the same as "phase-coherent". AD does have some good
app notes on implementing phase coherent FSK.

Tim.



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