Attila,
On 06/18/2015 08:36 AM, Attila Kinali wrote:
Moin Rick,
On Wed, 17 Jun 2015 13:08:04 -0700
"Richard (Rick) Karlquist" <rich...@karlquist.com> wrote:
Having said that, if an ordinary engineer had asked me this question,
I would think that he needed some coaching on how to clean up the
VCO with a synthesizer of sufficiently wide loop bandwidth. However,
you are very knowledgeable, so I will assume you are going to do
that and just want to predict the phase noise after clean up. The
trick (as most time nuts know) is to use a small enough capacitor
in the loop filter so that you get clean up at a 40 dB/decade rate
so you can actually make some headway against the 30 dB/decade
1/f slope.
Do you have any recomendation, where an ordinary engineer could
read up on this topic?
The trick is to convert the 2nd degree loop to a 3rd degree loop, which
then allows for a 12 dB/oct slope, to counteract the 9 dB/oct slope.
As the reference experience a low-pass action, the steered oscillator
experience a high-pass action, and it's the slope of the later which is
important here to combat the noise of the steered oscillator and then
replace it with the noise of the reference.
I can show you on a piece of paper when we meet.
Cheers,
Magnus
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
