[time-nuts] VCXO help
Tijd Dingen
tijddingen at yahoo.com
Fri Feb 25 12:17:33 UTC 2011
Hello Bert,
That rationale sounds suspiciously familiar. The quest for an ever simpler VCO,
that is. At the expense of some additional phase noise compared to VCXO+PLL, you
could use an ADF4360-9. It is readily available at for example digikey,
currently
for $6.26.
For my fpga based counter project I had pretty much the same thing as what
(I think) you are doing. Simplify it wherever possible... So first use a
PLL with integrated VCO, and see if the phase noise/jitter is not the limiting
factor to your performance. If it turns out to be limiting, you can always do
the more complicated VCXO + PLL + loop filter later.
Anyway, that ADF4360-9 suggestion is working under the assumption that you
are feeding it something like a 5 or 10 MHz reference signal. And it also
assumes you don't mind QFN packages. You know, the little buggers with 0.5
mm pitch and no pins.
regards,
Fred
"Bert Kehren" wrote:
> As part of the D/M project the counter uses a 100 MHz VCO with an AD 4001
> PLL. To simplify further I would like to consider a very simple VCXO, easily
> available components, no tuning, any ideas out there. For once phase noise
> is of no concern.
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